"We've got to start at the bottom and work up! And if we don't earnestly cheer each other on... we'll never be top heroes! "
Momo is a teenage girl with a mature physique for her age. She has a tall curvaceous figure and is one of the students in Class 1-A. She has cat shaped onyx colored eyes and long black hair. Her hair is normally tied into a spiky ponytail, and she has bangs on the right side of her face.
Her hero costume consists of a red leotard-like vest with silver linings and edges and matching red boots. She sports a gold utility belt that matches a band that goes across her chest. Her vest leaves space open from the center of the collar to the waist above the belt. This leaves much of Momo's skin exposed, including the area from her stomach to her chest and her arms and legs as well.
Momo is a very intelligent, dedicated person who acts as a natural leader. She is generally very level-headed and calm even in very dangerous situations, but she isn't above falling into a panic. Even so, Momo can get roped into silly situations such as cheerleading, although she rarely expresses enthusiasm in doing so.
Momo typically takes adverse situations in stride, like expressing little concern for losing most of her clothing during battle as she knows she can simply make another set. However, this often makes others think of her as an exhibitionist. Momo is somewhat sensitive to vulgarity and rude mannerisms and is constantly frustrated by sexual advancements from Minoru.
Momo can be very blunt with her explanations about the mistakes and situations of something or someone when asked. This is because Momo tends to be generally honest and wants her fellow students. She proves to be very caring and wishes to help her peers improve enough to become great heroes. As such, Momo is quite willing to help her classmates study with her and deeply enjoys it.
When Momo displays her excitement (usually towards passing time with others), she becomes quite upbeat and adorably "bouncy", adding a bit of comedy to her character. Momo also tends to accidentally reveal how rich she is, yet most people can understand she doesn't do it out of malice
While originally confident in herself, Momo's pride was crushed after her loss to Fumikage in the U.A. Sports Festival. It was further damaged when Momo began to compare herself to Shoto, and she began to lose confidence in her own ability to make choices. She found herself in deep denial during her internship with Uwabami. She believed Uwabami chose her despite being an unworthy student and continued to try and find deeper lessons in Uwabami's shallow training in order to reassure herself.
However, thanks to Shoto's encouragement during their final exams, Momo regained her confidence. She learned that all people have different skills and priorities, as well as all beings/things complement each other, thus respecting others despite their differences.
Momo was born into a famous hero family, gaining a powerful Quirk as a result. Being raised by an apparently strict mother who told her that she only needed to do the most urgent, fundamental things, Momo grew somewhat lonely, not doing things along with other children such as going to festivals. Her mother might have influenced her dedicated, initial insecure character.
During her teenage years, Momo got into U.A. through official recommendations, with the goal of becoming a Pro Hero.
Having gained entry to U.A. High through recommendations, Momo Yaoyorozu attends the first day of school with Class 1-A. Their homeroom teacher Shota Aizawa immediately brings the class to the training field for a Quirk Apprehension Test and claims that whoever comes in last will be expelled.
Momo manages to score first place in the entire class while Izuku Midoriya comes in last. Shota then reveals that he was lying about expelling the last place student to make sure the students did their best. Seeing everyone's shocked reaction to the news, Momo tells them she's surprised they didn't realize that earlier and says she should have mentioned it.
Momo answers one of Present Mic's questions in English class the next morning. That afternoon, Class 1-A participates in combat training for their Hero Basic Training class taught by All Might. They meet him at training ground beta after changing into their hero costumes. He splits them up into teams of two and has them simulate a hero versus villain situation. Momo ends up paired with Minoru on Team C.
Following the first battle trial, All Might states Tenya Iida was the best in the battle despite his team's failure. He asks the students why this is the case and Momo responds. She replies that Tenya embraced the spirit of the trial while Ochaco let her guard down, Izuku rendered himself helpless and Katsuki's judgment was clouded by a grudge. She goes on to say that she and her classmates must devote themselves wholeheartedly if they wish to become Pro-Heroes.
The next day in homeroom class, Shota tells the class they need to choose their Class President. The class follows Tenya's suggestion of voting for the president and Momo gets the second most votes behind Izuku. To her dismay, she is made Vice-President while Izuku becomes the Class President. However, when it comes time to decide who the Class Officers will be, Izuku decides to give his role to Tenya. This leaves Momo discouraged because she still believes that she should be the representative. Later on, Shota announces to the Class that they will partake in rescue training at an outside facility.
During the bus trip to the aforementioned facility, Momo tells Ochaco that the argument between Katsuki and others is too vulgar. Class 1-A arrives at the Unforeseen Simulation Joint, where they meet the Space Hero: Thirteen. Thirteen explains she developed the U.S.J with the focus on training future heroes on using their Quirks to help others. Suddenly during Thirteen's speech, real villains invade the facility through a warp gate.
Shota fends off the villains on his own and leaves Thirteen to evacuate with the class. They prepare to escape, but they are cut off by the villain Kurogiri. Katsuki and Eijiro attack him, but end up dealing no damage. Kurogiri responds by warping the class to the various areas in the facility. Momo is warped to the Mountain Zone along with Kyoka and Denki. She uses her Quirk to create a metal staff for herself and a sword for Kyoka to defend themselves.
While they're surrounded by villains, Denki mentions that he cannot shoot out his electricity or else he'll shock the girls too. Annoyed, Kyoka kicks him into a villain so that he can electrocute them. Another villain tries to get the jump on them, but Momo uses her Quirk to trap him in a net and he falls into Denki's electrical field as well.
Momo creates a sheet of insolation to protect herself and Kyoka. She tells Denki he can attack without restraint and so he blasts the villains with an electric attack, and ends up destroying most of Momo's shirt. Kyoka points this out, but Momo replies that she can simply make new clothes. 
Denki's Quirk renders him helpless after he overuses it, leaving him open to an electric villain hiding underground. He warns Momo and Kyoka to surrender and threatens to kill Denki. Momo notices Kyoka trying to distract him while using her Quirk, but he quickly becomes wise to her act. Before it's too late, the trio is saved when the Pro Heroes arrive at the facility. Snipe uses his Quirk to shoot the villain multiple times to free Denki. Then Ectoplasm arrives to escort the students out and take the villains into custody. Afterward, Detective Tsukauchi takes Class 1-A back to U.A. High.
Two days after the attack on the U.S.J., Momo and her classmates return to school discuss the attack. After Shota returns to class, the students get lectured about the importance of the upcoming U.A. Sports Festival. Momo mentions that she's excited about the opportunity to get scouted. For the next two weeks before the festival, Momo trains by reading up on the molecular structures of the items she can create. The day of the U.A. Sports Festival arrives and Momo changes into her P.E. clothes and prepares with her classmates in their designated waiting room. Like the rest of her peers, Momo takes notice when Shoto challenges Izuku.
Chief referee of the Sports Festival: Midnight announces the preliminaries will be an Obstacle Race four kilometers around the stadium, which immediately begins after the rules are explained. The students begin the race jam-packed inside a narrow corridor. Shoto freezes the tight space and gets out to an early lead, but Momo and others use their Quirks to avoid it.
They all reach the first obstacle, which is a blockade of giant villain bots. Momo uses her Quirk to create a cannon and effectively shoots all of them down to clear the path. After reaching the minefield, Momo is attacked by Minoru, who uses his Quirk to stick to her back and piggy-back on her all the way to the finish line. She finishes in seventeenth place while carrying Minoru against her will. After completing the race, she tells him that he's the worst. This qualifies them both for the second event: The Cavalry Battle.
Shoto chooses Momo for his team along with Denki and Tenya. He tells Momo that her role on the right wing provides insolation and defense for the team. She creates skates for herself and Denki so that the team can move very quickly and take advantage of Tenya's speed in the front of the formation. Towards the middle of the event, Team Todoroki confronts Team Midoriya for their ten million point headband.
They attack Team Midoriya at the same time as many other teams. Shoto orders Momo to ready her Quirk to protect them from Denki's lightning. She also creates a stone staff for Shoto to use. Denki electrocutes the other teams and Shoto uses the staff and his ice powers to freeze them all in place. Fumikage was able to defend against Denki's attack, giving Team Midoriya the chance to flee. Team Todoroki proves to be too fast for them to get away. Fumikage attacks with his Dark Shadow to stop their pursuit, but Momo defends Shoto by creating a block of stone to impede Dark Shadow's attack. Team Todoroki corners their opponent, but Team Midoriya is able to keep away from them by exploiting Shoto's weakness and keeping to his left side.
With only a minute left in the competition, Tenya decides to use his Recipro Burst technique to steal the ten million point headband. In an instant, Shoto grabs the points by using Tenya's burst of super speed. Although, it renders the team immobile afterward since Tenya's engines become stalled.
Team Midoriya attacks in a last-ditch effort to get their points back but ends up grabbing the incorrect headband. Momo mentions that they mixed up the headbands knowing Team Midoriya would underestimate them. Once the Cavalry Battle concludes, Team Todoroki finishes in first place and all their members move on to the finals: a one on one fighting tournament. Tenya apologizes for nearly costing them the competition, and Momo encourages him by saying he's the reason they won at all.
Prior to the finals, all the participants are allowed an intermission for recreational games and rest. Momo goes to get food with Kyoka and they're both told by Denki and Minoru that they must dress up as cheerleaders for the cheer battle. Momo believes them and makes cheerleading outfits for the girls in Class 1-A, but this turns out to just be a prank from the boys. Momo yells at them and then falls into dismay for falling into their scheme. Midnight calls all the students to draw lots for the fighting matchups and Mashirao suddenly decides to withdraw from the tournament, surprising Momo and others. He explains that he was simply Hitoshi's puppet and doesn't wish to advance, and he also questions why the girls are dressed as cheerleaders. Momo and the girls are embarrassed by this.
Momo ends up matched up against Fumikage for the sixth battle. Fumikage promises to give it his best, which Momo appreciates. During the recreational games, Momo reluctantly cheers with the other girls. The first round's sixth fight eventually arrives and Momo takes the stage to face Fumikage.
Momo is visibly nervous for their bout since Fumikage's Quirk allows him to effectively attack and defend. She ponders over a strategy to defend herself by creating a shield, but she's interrupted when the battle suddenly starts. Fumikage calls Dark Shadow to attack immediately and Momo blocks it with a shield just like she planned. She tries to follow up by making a weapon, but Dark Shadow keeps pressuring her by attacking her shield repeatedly. She's unable to focus on her Quirk until Fumikage mysteriously stops attacking. Momo creates a staff and prepares to counterattack until Midnight points out that she's pushed out of bounds. Fumikage is named the victor in the quickly ended bout, greatly disappointing Momo.
Momo watches the rest of the matches from the stands alongside her peers. She and Mina wonder why Fumikage is put on the defensive during his battle with Katsuki since he defeated them both so easily. After Katsuki wins the Sports Festival, Momo joins her peers for the closing ceremony.
Class resumes at U.A. two days after the Sports Festival. Momo joins her class in learning about Hero Informatics during homeroom. Shota reveals the Pro-Hero draft results, with Momo receiving one-hundred and eight offers from pros. Midnight joins the class to help the students choose their hero names. Momo chooses the moniker Everything Hero: "Creati".The students are given personalized lists of hero agencies they are to choose from along with their nominations. When the internship week arrives, Momo and her class meet at the train station.
Momo chooses Uwabami's Hero Office to intern at along with Itsuka Kendo from Class 1-B. They both arrive in the middle of Uwabami shooting a commercial. Itsuka mentions that she was hoping for something more heroic to then watching that, but Momo emphatically replies that garnering popularity is unavoidable as a hero and she will take any lesson Uwabami has for them. Itsuka takes note of Momo's enthusiasm  and then asks if there's anything else they can do during the commercial. Uwabami responds by admitting that the main reason she chose them as interns is that because they're both cute. Both Momo and Itsuka are slightly taken back by their new mentor's response.
They later accompany Uwabami to one of her photo shoots. Itsuka mentions how she feels more like an entourage then her interns. Momo replies that there must be some kind of lesson they're missing, but Itsuka believes Momo is in denial. A few days later, Itsuka and Momo appear in a commercial for UNERI Hairspray with Uwabami. The Snake Hero shows them both a demo tape of the ad, but Momo appears to only be embarrassed by this. Uwabami decides to take them both on patrol afterward, much to their excitement.
Momo returns to school following the conclusion of her internship. When Izuku, Shoto and Tenya's run-in with the Hero Killer is brought up during class, Momo mentions that she was worried about the boys. She attends Basic Hero Training with her class afterward where the class participates in a rescue training race. While the first group prepares to go, Momo tells Kyoka she believes Izuku is at a disadvantage because of his lack of mobility. She's quickly proven wrong when Izuku jumps out to an early lead using the new mastery over his Quirk, much to Momo's shock and amazement. She watches as he maintains the lead until he trips causing him to lose.
After class, she joins her female peers inside the girl's locker room. Minoru tries to peep on them using a hole in the wall but Kyoka stops them. Momo notes how cowardly and vile Minoru's action was. She thanks Kyoka for stopping him and says they need to plug the hole immediately.
One week prior to final exams, Denki and Mina discuss how worried they are for the written portion. Momo placed first in the midterms and she says she's more than willing to help them study. Unlike them, she's much more worried about the practical portion. Kyoka, Hanta, and Mashirao ask for her help as well. Momo blushes with great pride and excitement. She gracefully says she's excited to help them and will hold a study session over the weekend at her residence. She begins monologuing about how she'll have her mother set up the great hall with tea for the study session. Her peers notice her accidental bragging, but they don't care because they know that she's so excited and bouncy that she doesn't even know she's bragging about her wealth.
They all eventually meet up at the Yaoyorozu's giant, fancy estate, where Momo helps them study. Thanks to her guidance, Denki and Mina feel they do well on the three days of written tests. The day of the practical arrives following the three days of written tests and Class 1-A meets up with many of the teachers at the central plaza of the exam arena.
The students believe they'll be fighting villain bots for the finals, so Kyoka asks Momo why so many teachers need to be present. Shota and Principal Nezu reveal that this actually won't be the case. Momo is surprised that the teachers are changing the format for the first time. Nezu explains that in order to better prepare the students for real-life encounters with villains, they will be paired off and matched up against one of the teachers. Momo and Shoto are paired up against Shota.
A few days before the practical, the teachers met to discuss the change. Shota mentions that he will face Momo and Shoto to exploit their weakness since they both rely too heavily on their powerful Quirks. Back at the central plaza, all of the matchups are revealed in order. Momo and Shoto are set to face their homeroom teacher in the fourth practical battle. They will be allotted thirty minutes to either capture him or escape the battle stage through an escape gate. All teachers will wear compressed weights to give the students a handicap.
Momo waits by herself in an isolated room while the first two battles commence. Fumikage and Tsuyu manage to defeat Ectoplasm in the second battle. Momo says to herself that she's not surprised, and has a flashback of her embarrassing defeat at the hands of Fumikage before exiting the room. She meets up with Shoto in a replica city just before their exam begins. Shoto catches her daydreaming and asks if she's nervous. He admits he doesn't blame her since they're up against Shota and says not to worry because he has a plan for them to win.
Their practical battle begins as they run through the fake city. Shoto explains his plan is for Momo to create small objects so once she's unable to keep producing them they will know Shota is close by. Shoto plans to draw him in so Momo can run through the escape gate, and tells her to stay close to him until then. Momo reluctantly goes along with it since she's lost confidence in her own ability to make decisions.
Momo begins making matryoshka dolls and praises Shoto for his quick thinking. She tells him that although they were both let in on recommendations, Shoto's shown more practical skills for being a Pro-Hero. She admits that she only followed his orders in the Cavalry battle and that she was swiftly exposed as a weakling when it was her turn to fight. Shoto interrupts when he notices Momo's stopped producing the dolls. She apologizes, but it's too late as Shota has already found them both.
Momo runs away on Shoto's command. She starts to panic and several indecisive thoughts run through her head. Her lack of confidence is even evident to Shota himself, who quickly catches up to her. He uses his capturing weapon to grab her arm, but she notices her Quirk isn't erased and uses it to free herself. She runs in the opposite direction back towards Shoto. She finds him hanging from a light post, restrained by Shota's capturing weapon. She apologizes but Shoto warns her that Shota is fast approaching. She begins to panic again, unable to decide whether to run or save Shoto. He asks her if she has a plan and apologizes for not asking her beforehand. Momo says it won't work since his plan failed earlier. Shoto encourages her to trust her instincts because he believes she's better at leading their team then he is. He even admits that he voted for her to be Class President because he felt she would be best at leading the class. Shoto's encouragement helps Momo believe in herself and she realizes how disgraceful she's been acting.
Shota eventually reaches them and asks if Momo's given up. She responds that she hasn't and warns Shoto to close his eyes. She throws the dolls at Shota and he hits them, triggering the flash bombs inside them. Momo uses the opening to free Shoto from his restraints and announces that she does have a plan to take advantage of Shota's weakness.
They both run away from Shota as Momo explains that his Quirk has been unstable since his injuries fighting Nomu. They rush down a street as Shota attacks them again with his capturing weapon. Momo mentions that passing the exam is all a matter of timing. Shoto questions how timing is relevant if Shota can take away their Quirks at any given time. Momo thinks to herself that Shoto's wrong to believe that Shota can keep their powers erased. Just as Momo expects, Shoto's Quirk returns to him in time for him to use his Giant Ice Wall technique to block off Shota's pursuit of them.
Momo creates a weapon similar to Shota's using her Quirk and explains her full plan to Shoto. He agrees with her and they go through with it together. They run from behind the ice wall wearing cloaks. Shota attacks them, but the upper halves are only mannequins and a catapult was hidden under the cloak as well. Momo tries to trigger it and shoot the cloth at Shota, but she misses. Shota backs off anyway, giving her a chance to trigger it. She orders Shoto to blast his flames and explains that the weapon is made of nitinol alloy and when it's heated it returns to its original shape instantly. This traps Shota in an instant, allowing Momo and Shoto to handcuff him and pass the exam.
Shoto mentions that her plan went a bit too smoothly. Momo replies that she messed up by missing the initial trigger, and believes that Shota may have let them win. Shota explains that he was simply distancing himself from Shoto since he was still covered with a cloth, and this is what lead him directly into her trap. Shoto realizes it was a matter of timing all along and thanks Momo. She's overwhelmed with emotion and begins to cry. Shoto asks what's wrong, but she tells him it's nothing. He tells her there's a pressure point on her foot if she's feeling nauseous, and she tearfully tells him again that it's nothing.
Momo watches the remaining exams from the monitoring room. During Denki and Mina's battle with Nezu, Momo deduces that the principal is predicting his opponent's moves and planning his attacks through specific calculations using his Quirk. Momo, Tenya, Izuku, and Tsuyu are shocked when his sadistic attitude comes out during the match. Ochaco enters the room and is shocked to find that Mina and Denki fail the exam, which Momo confirms to her.
Koji and Kyoka are able to pass thanks to the former's Quirk, but everyone in the room is disgusted that he attacked Present Mic with bugs. Mezo and Toru pass as well. Momo mentions that Toru is unmatched when it comes stealth ops. Momo isn't amused to watch Minoru run from Midnight during their battle, but she's pleasantly surprised to see him pass. All Might proves to outmatch Katsuki and Izuku in their fight. Momo and the others watch in horror until Izuku carries Katsuki through the escape gate.
Class 1-A returns to homeroom class following the conclusion of finals. They're given the next day off and Shota reveals that everyone will be going to training camp in the woods over summer break. Most of Class 1-A decides to go shopping together at the Kiyashi Ward Shopping Mall to buy necessities for the forest lodge. At the shopping mall, Kyoka says that she wants to buy a duffel bag and Momo replies that she will help her look for it.
The next day after the shopping trip, at U.A., Shota informs Class 1-A that the destination for their lodge trip has been changed and the new destination will only be announced on the day of the event. The first semester has come to a close and summer break has begun.
On the day of the event, Class 1-A boards a bus that will take them to the forest lodge destination. An hour later, Class 1-A's bus stops for a restroom break. However, Class 1-A notes that Class 1-B is not at the rest stop. Suddenly, two females wearing cat-like costumes and a small boy appear; the females excitedly introduce themselves as the professional Hero Team, The Pussycats. The black haired female explains to Class 1-A that they will be staying at the base of a mountain which is a part of their domain; they have three hours to reach the base of the mountain using their Quirks as they please and those who do not arrive there by 12:30 pm will not be served lunch. Soon, Class 1-A realize that they have already arrived at their destination and their training camp has already begun with the Pussycats being their supervisors. Some of Class 1-A try to leave, but Pixiebob uses her Quirk to create a landslide of dirt that causes Class 1-A to fall into a forest called Forest of Magic Beasts, which they must traverse to reach their destination. Suddenly, Class 1-A are confronted by a beast; Kouji tries using his Quirk to control the beast but it does not work due to the beast being made out of dirt. Izuku, Shoto, Tenya and Katsuki mobilize and use their Quirks to destroy the dirt beast.
After Izuku, Tenya, Shoto and Katsuki destroy the dirt beast, Class 1-A begins traversing the Forest of Magic Beasts. However, the journey through the forest to the Cabin takes around about 8 hours. Class 1-A arrive at the facility, battered and tired. It is now 5:20 pm in the evening. Pixiebob admits that she thought they would take longer to get to the facility.
Class 1-A fetch their luggage from the bus and put it in their rooms. Class 1-A go to the dining hall to have dinner. After finishing eating dinner, Class 1-A go to the hot springs. The next day at 5:30 AM, Class 1-A are outside the training camp cabin. Shota greets his students and tells them that they will undergo reinforcement training to strengthen and upgrade their Quirks which will also allow Class 1-A to obtain their temporary licenses.
During the third day of the training camp, the Vanguard Action Squad attacks, filling the forest with fire and gas. Momo acts and creates gas masks for several students such as Tetsutetsu and Ibara. Momo runs into Yuga Aoyama and asks him to take the unconscious Kyoka and Toru Hagakure back to the facility. Momo goes further into the forest and runs into Yosetsu Awase. Suddenly, they are attacked by the Vanguard Action Squad's Nomu and in the process Momo is badly injured, causing Yosetsu to carry her while running away from the Nomu. The injured Momo apologizes to Yosetsu for dragging his speed down.
The Nomu reaches Yosetsu and is about to attack him with one of its weapon arms. Suddenly, the Nomu's chainsaw arm stops; the Nomu retracts its weapon arms into its body and begins walking back to the Vanguard Action Squad's rendezvous point. Momo realizes that the Nomu is being called back because the villains have captured Katsuki. Thinking of a plan, Momo creates a button (in the form of a tracking device) and asks Yosetsu to weld the button onto the Nomu. Yosetsu does what Momo asked and uses his Quirk to bond Momo's button onto the Nomu. As the Nomu walks away with Momo’s button stuck on it, Yosetsu and Momo decide to make a run for it.
After Katsuki is captured by the Vanguard Action Squad, Momo is taken to the hospital to have her injuries attended to. The next day, Momo's head injury is mostly healed and has regained consciousness. During the day, All Might and the Police Force visit her; Momo explains that Yosetsu planted a transmitter she created onto one of the villains and hands a device to All Might that will allow him to locate the transmitter. All Might applauds Momo's growth and finds her to be worthy of being a Hero, asking her to leave the rescue of Katsuki to him. Later that day, Eijiro Kirishima asked Momo to think about rescuing Katsuki, telling her that she can give her answer whether to rescue him or not tomorrow night.
The next day later that night, Shoto along Eijiro wait for Izuku and Momo. Izuku and Momo arrive but before Momo can speak, Tenya appears. He is angry that they are about to repeat the same mistake he made at Hosu. Despite Izuku knowing that breaking the rules is against the law, Tenya punches Izuku in the face. Tenya is angry and frustrated that they are not taking his concerns, feelings and worry into consideration; Tenya says that he does not want to see Izuku or any of them land up with severe injuries.
Shoto tells Tenya that they will not engage the villains in combat while Eijiro states that their rescue will be covert. Momo states that she came along to accompany them all in order to prevent them from engaging in combat. Izuku tells Tenya that after failing to save Katsuki at the training camp, his gut feeling is telling him that he must save Katsuki. Tenya sees that they are determined and resolute and is cheered up by the fact that they won’t engage in combat; Tenya decides to go with them.
Momo along with Izuku, Eijiro, Tenya and Shoto travel by train to the city where Momo's tracking device detects the villain with her button beacon. After putting on disguises, they head towards the League of Villains' hideout. They continue towards the place that Momo's tracking device is detecting. After waiting for a while near the place, Momo notes that the villains have made no movements and states the possibility of Katsuki not being in the place while Tenya reminds them that if he sees any combat, then he will not hesitate to stop them.
Afterwards, Momo, Tenya, Shoto, Eijiro, and Izuku prepare to infiltrate the supposed League of Villains’ hideout. The group go to the back of the hideout and see a window. Momo acts as recon while Izuku and Eijiro see what is inside with the night-vision goggles Eijiro brought along. Suddenly, Mount Lady destroys the front of the warehouse which shocks Momo.
Seeing that the Pro Heroes are at the warehouse, Momo and the group assume that All Might is with Katsuki as they are speaking and decide to head home. Suddenly, the entire warehouse is completely destroyed by a man along with the surrounding area being significantly damaged. She was paralyzed by fear due to All For One's overwhelming presence and is unable to move.
As the battle between All Might, All For One, Katsuki and the League of Villains continue, Izuku comes up with an idea and explains his plan to Momo and the group. Momo watches as Izuku, Eijiro, and Tenya enact the plan Izuku came up with, which allows them to rescue Katsuki. Seeing that Izuku, Eijiro , and Tenya have succeeded in rescuing Katsuki, Shoto and Momo begin escaping from the battlefield.
Shoto later phones Izuku and finds out that him and his group are at the train station. After All Might defeats All For One, Momo and Shoto meet up with Izuku and his group. They take Katsuki to a Police Station for his safety. Afterwards, Momo goes home.
Momo and the other students explore the dorms. Her room is extravagant and cramped. She votes Rikido Sato the winner, solely because of his cake.
Later, Momo and the other students create special moves. She mentions she is having trouble performing the special move she has in mind. Momo and the rest of her class pass the first exam.
At U.A. High School, Class 1-A along with Momo choose to make a band and dance performance for the U.A culture festival.
In Class 1-A's Heights Alliance, Tenya Iida is busy helping plan Class 1-A band and dance performance. Katsuki also expresses his discontent with Class 1-A presenting the band and dance performance as a stress reliever, believing people who sicken him do not deserve his courtesy, and states that all they are doing is indulging the other students. Tenya and Momo Yaoyorozu take Katsuki's views into consideration as Shoto Todoroki points out that Katsuki should not speak ill of them if he has not even partaken in the conversation. Katsuki tells them that they do not fight villains because they enjoy it and likewise they should not consider people's feelings for a band and dance performance; if they are going to do a band and dance performance, they should do it for the sake of it and not to please or help people. Katsuki announces that he will blow everyone away in U.A. with his sound. Momo and some of Class 1-A are surprised with Katsuki's willingness to participate.
Quirk and Abilities
Creation (創造 Sōzō?): Momo's Quirk gives her the ability to create any non-living material from her uncovered body through the molecular manipulation of her fat cells. As long as she has an understanding of how something is made, she can create it. However, it takes her a longer period of time (and more of her skin being exposed) to create large objects. She states that the more she eats, the more material she has to work with, so she needs considerable ingestion of food for her Quirk to be effective. This makes a possible danger that she would likely become extremely underweight if her Quirk is used too much.
Bukijutsu: Momo skillfully wields several weapons to great effect against her opponent, for both offensive and defensive purposes. Her bojutsu is considerably remarkable, having great effect against a large group of villains during the assault on U.S.J.
Conditioning: Momo placed first in Shouta Aizawa's fitness test, an exceptionally impressive feat considering almost everyone had at least one superhuman result and the end result was cumulative of all ten tests.
High Intellect: Momo is ranked as having S class intelligence, making her a genius. Her analytical skills are strong, thus allowing her to easily devise plans and strategies both in battle and in other situations, which she has no trouble putting in motion due to the versatility of her Quirk. Academically speaking, Momo must understand the structure and composition of anything she wishes to create using her ability. This also helps her to earn very high marks in school.
Teaching Ability: Momo is considered an extremely good tutor by her peers, holding several study classes for the students who have more academic difficulties. The results have been noticeable judging by the results of U.A.'s End of Term Test, where none of the low-graded students failed in the written exam.
Musical Talent: Momo is capable of playing the piano and similar key-based instruments, due to having gone through etiquette training during her childhood.
Hero Outfit: Momo's hero outfit allows her to expose as much of her skin as possible so that she can use her creation Quirk much more easily.
- The Yaoyoreotard: This equipment makes it easier to pop out what Momo creates, though it leaves not much to the imagination.
- The Yaoyoro-Belt: This equipment is a bit thick in order to prop up her "Yaoyorictionary".
- The Yaoyorictionary: This equipment is made of lexicon compiling all the constructs and materials that comes to Momo's mind. It also has magnets attached to the cover and inside pages so that it doesn't open or fall.
Although their interactions initially had been minimal, Momo and Shoto are friendly towards each other. They have many similarities: both are students who got into U.A. through scholarships, hail from famous yet strict Hero families and have powerful Quirks. As a result, Momo would always compared herself to Shoto and believed that he was always a step ahead of her; not having self-confidence in herself. However, this also caused her to admire Shoto for having brimming self-confidence as a hero.
For his part, Shoto has a deep respect for Momo's observation skills and natural leadership, even telling her that he voted for her during the Class President election, as he thought that she excelled at the role of being a leader. He later chose Momo for his team at the Human Cavalry Battle in the Sports Festival, but she felt she was only following his orders.
During the practical end of term test, Momo was paired with Shoto against Eraserhead. He quickly came up with a plan of action, and Momo went along even knowing its flaws. Throughout the exam her low self-esteem caused her to panic and be indecisive. However, Momo regained her confidence once Shoto, captured by Eraserhead, realized she needed to be encouraged and so revealed he had voted for her to be class president. This inspired Momo and gave her the confidence needed to not only free Shoto, but also outwit and capture Eraserhead with his help, proving to be a great team.
After the fight, the two heroes-in-training had became closer, trusting even more in the other, recognizing their problems and comfort the other when necessary. This was seen when Momo comforted Shoto in the Ennichi Festival, assuring him that he isn't alone anymore as his comrades (classmates) now. Shoto also asked Momo to help him (along with Izuku Midoriya and Tenya Iida) to rescue Katsuki Bakugo without needing to fighting when the latter was captured by the League of Villains.
Momo and Kyoka appear to be close friends with each other. Along with Denki, the two battled against the Villain Alliance at the USJ, proving to work well together. Kyoka later asked Momo to tutor her for the end of term test, which she happily accepted.
When the class split up to go shopping for the training camp, they paired up and went off shopping together. Kyoka has proven to be somewhat defensive of her, as she punched Sero for comparing her quirk ability to convert fat at an atomic level into many different objects, to pooping.
Momo trained under her for her internship. She was disheartened by the fact that they did not do any hero work and tried to convince herself that there was something she could learn from the experience.
Itsuka and Momo interned together under Uwabami. Although they were treated like Uwabami's entourage during their time together, Momo always tried to find a lesson in everything. Itsuka appeared to feel sorry for Momo, seeing that she was clearly in denial.
Momo despises Minoru for his perverted behavior, especially after he and Denki tricked her and the other girls in their class into wearing cheerleader outfits.
- Momo design in the preliminary stages of the series was relatively similar to her current design. She already had her trademark ponytail, although it was less spiky, and her body overall was slightly slimmer. Her hero costume had a few differences though, such as the lack of a torso opening and a sort of partial mask worn around her nose area.
- Momo was the only character censored during the USJ Arc, due to her tearing her clothes off to create the insulated sheet.
- Momo's family name "Yaoyorozu", is an idiomatic expression which translates to "a great/uncountable number", referencing her Quirk. The kanji, 八百万, literally means "eight million".
- In the First Popularity Poll, Momo ranked 11th.
- Momo's U.A data is as follows:
- Momo is also one of 4 students who got into U.A. High through a scholarship, alongside Shoto Todoroki, Juzo Honenuki and one more student.
- Momo likes reading (especially illustrated encyclopedias).
- In Chapter 124, Momo broke the fourth wall, when she pointed out that Mirio only needed 3 frames to explain the Hero Internship.
- (To her classmates) "We've got to start at the bottom and work up! And if we don't earnestly cheer each other on... We'll never be great heroes!"
- (To Shoto Todoroki) "But I'm not someone else. I'm a classmate friend of yours from the hero course. Midoriya-san, Iida-san, Uraraka-san. All of us... are Todoroki's comrades."
- (To her classmates) "I believe in Todoroki... but I came with the intention of accompanying you all... As a failsafe! Should the unthinkable happen, I will prevent combat!"