Itsuka is a young girl with large green eyes, and orange hair tied into a ponytail that hangs from the side of her head.
Itsuka is a spirited girl who is also thoughtful of others. She does not hesitate to criticize even her classmates if she feels what they are doing is not right, like whenever she stops Neito from antagonizing Class 1-A. and the rest of Class 1-A. She is also willing to pass on opportunities that would benefit her if she feels other people deserve it better, shown when she let Tetsutetsu and Ibara participate in the tournament event of the Sports Festival in place of her team.
She seems to also be friendly to people outside her class, and seems to hold no signs of ill-will towards class 1-A, making her a minority of the seen 1-B students. She has displayed sympathy towards others, even if she is not particularly close to them. She showed concern for Izuku and Tenya after hearing about their run-in with Stain, and helped Class 1-A by telling them what was supposed to be on the Final Exam's practical portion.
When in combat, she is calculating and shows that she is very intelligent. She is able to understand Mustard's Quirk, reckoning it to that of a tornado, and using that logic to determine the users location. She is also able to use her own Quirk to dispel the gas Mustard makes, allowing her and Tetsutetsu to fight without the need for gas masks.
Itsuka first appears alongside her classmates during the opening ceremony of the U.A. Sports Festival. She places twenty-eighth out of thirty in the first event, the Obstacle Race. Having qualified for the Cavalry Battle, Itsuka teams up with Reiko Yanagi, Kinoko Komori and Setsuna Tokage.
Itsuka notices Neito disrespecting Katsuki and tells him to stop getting their opponents so riled up. Once Team Todoroki corners Team Midoriya and their ten million points, Team Kendo is amongst the teams who try to capitalize. However, Denki of Team Todoroki uses his Quirk to electrocute all the surrounding teams including Itsuka's. Then Team Kendo and the other students are subsequently frozen by Shoto Todoroki. Shoto takes a few of Itsuka's headbands after freezing her team in place, prompting Itsuka to yell for him to come back. Kosei Tsuburaba mentions to Neito Monoma that Itsuka isn't a factor for the rest of the round.
In between the end of the Cavalry Battle and the finals, Itsuka hangs out with her team, Neito and Tetsutetsu. They are all shocked to see the Class 1-A girls dressed in cheerleader outfits. As the teams who advanced to the finals are being announced, Mashirao and Nirengeki withdraw. Midnight suggests that two players move up from Team Kendo since they finished in fifth place. However, Itsuka admits that she was frozen most of the round and suggests Midnight choose from Team Tetsutetsu since they kept fighting throughout the battle.
Prior to the finals, Itsuka and many other students participate in recreational games. For the scavenger hunt, Itsuka turns Neito in because she needs a "perverse person". After Ibara defeats Denki in their fight in the finals, Itsuka stops Neito from taunting Class 1-A. She knocks him out and apologizes to Class 1-A for his behavior. She and her classmates watch the rest of the finals from the stands. Itsuka teases Neito for making a scary enemy in Katsuki Bakugo after he advances to the final match. When it all concludes, she joins her class in viewing the closing ceremony. 
Itsuka receives a draft nomination from Pro Hero Uwabami to intern at her agency. When she arrives, Itsuka meets Momo Yaoyorozu and they are both present for Uwabami's commercial. Itsuka mentions that she was hoping for something more heroic, 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 theres anything else they can do during the commercial. Uwabami responds by admitting that the main reason she chose them as interns are because they're both cute. Both Itsuka and Momo are slightly taken back by their new mentors response. 
They 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. Later on, Itsuka and Momo appear in a commercial for UNERI Hairspray with Uwabami. The Snake Hero shows them both a demo tape of the ad and Itsuka mentions how it's weird they'll be on television. Uwabami decides to take them both on patrol afterwards, much to their excitement. While out on patrol, Uwabami is approached by a group of fans. She mentions how hard work can make heroes famous, but Itsuka says she's just out of touch with reality. 
A week before final exams, Itsuka notices Neito once again antagonizing Class 1-A. She chops him in the back of the neck to knock him unconscious and reprimands Neito, saying that the trouble Izuku, Tenya, and Shoto went through isn't not funny.
Itsuka apologizes to Class 1-A for Neito's immature behavior and says she overhead them talking about the ambiguity of the practical portion for final exams. She reveals that she heard from an upperclassman that the test would be a battle simulation fighting against villain bots. Neito criticizes her for revealing this to the "deplorable" Class 1-A. Itsuka chops his neck again and drags him away telling him that there isn't anything wrong with Class 1-A.
On the day of the forest lodge trip, when Neito finds out about some of Class 1-A needing supplementary lessons and mocks Class 1-A for their failures. Itsuka hits Neito on the neck and apologizes to Class 1-A for his disrespectful behavior.
When Class 1-B arrives at the training camp, their homeroom teacher Sekijiro Kan explains that they will be extending their Quirks and that the more they use their Quirks, the stronger they will be by breaking their limits. When Class 1-B witness Class 1-A's training, Itsuka asks Shota Aizawa how they can observe everyone, and he explains that is the reason the Pussycats are around. Later that night, Class 1-B act as the scaring group during the test of courage. In the forest, Itsuka and Juzo Honenuki commend Yui Kodai for scaring Shoto and Katsuki. However, smoke entering the forest knocks out Juzo. Itsuka takes action and uses her Large Fists to cover Yui from the smoke.
Itsuka carries Yui and Juzo with her Quirk, trying to find a safe place. Itsuka runs into Tetsutetsu Tetsutetsu and Ibara Shiozaki who are wearing masks. Tetsutetsu informs Itsuka that Momo was nearby and made masks for them. He also tells Itsuka that Yosetsu Awase is leading some of Class 1-A to the Class 1-B safe zone for aid. Tetsutetsu gives Itsuka, Yui, and Juzo masks. After Itsuka and Yui put their masks on and Yui puts a mask on the unconscious Juzo, Itsuka thinks that they should head back to the facility. However, Tetsutetsu refuses to flee and decides to stay and fight, telling Itsuka to take care of Ibara. Itsuka questions Tetsutetsu's actions, to which Tetsutetsu tells Itsuka why he has decided to fight; they have known for the longest time that Class 1-A has always been ahead of them because they have been exposed to danger and used that exposure to gain invaluable experience in order to become better Heroes. Tetsutetsu continues to say that they will not be Heroes if they run away from evil and danger that threatens the lives of others. Tetsutetsu declares that he will expose himself to danger in order to become a Hero and promises to defeat the villains.
Tetsutetsu and Itsuka continue walking through the forest. Itsuka realizes that the gas is not dispersing and surmises that a villain is manipulating the gas. They decide to find the villain responsible for the gas. As Tetsutetsu and Itsuka reach the source of the poisonous gas, Mustard feels their presence and is impressed that they figured out the gas phenomena. He takes out a gun in preparation for their arrival. Suddenly, Tetsutetsu appears in front of Mustard and prepares to attack him with his steel fist. However, Mustard fires his gun at Tetsutetsu.
Tetsutetsu manages to block Mustard's bullet using his Quirk. Mustard shoots at Itsuka but Tetsutetsu throws himself in front of Itsuka to block the bullet. After Mustard attacks Tetsutetsu repeatedly, Itsuka attacks but Mustard evades. Itsuka enlarges her right hand and smacks Mustard away. Seeing that the gas is a hindrance, Itsuka enlarges her hands, uses them to swirl the gas away, and mocks Mustard for acting cowardly by using a gun to fight. Mustard prepares to fire his gun at Itsuka for her insult. Out of nowhere, Tetsutetsu appears behind Mustard, who was unable to notice Tetsutetsu's presence due to the gas dispersing courtesy of Itsuka. Tetsutetsu holds his breath and punches Mustard in the face with his steel fist, which crushes his mask and in the process knocks him unconscious. The victorious Tetsutetsu lies down on the ground and regains his breath.
Itsuka and Tetsutetsu head back to the facility with Mustard in tow. After Katsuki is captured, the Vanguard Action Squad withdraws from the battlefield, ending the attack. Mustard is arrested thanks to Itsuka and Tetsutetsu.
Quirk and Abilities
Large Fists (大拳 Daiken?): Itsuka's Quirk allows her to enlarge her hands to a gigantic size.
Hand-to-Hand Combat: Itsuka seems to be quite capable at hand-to-hand combat, as she could incapacitate Neito Monoma with a karate chop.
Enhanced Strength: Itsuka appears to have strength greater than the average human, since she can carry people and lift her enlarged hands without a problem, as seen in her fight against Mustard. Her enlarged hands grant her proportionally increased chopping and gripping strength.
Intellect: Itsuka is shown to be rather intelligent, demonstrated when she theorized the location of Mustard and the pattern of his Quirk. She is also tactical, being able to figure out how to dispel of Mustard's gas.
Itsuka and Neito are friendly towards one another and can often be seen with each other. However, she does not approve of Neito's constant mockery of Class 1-A. Whenever he decides to taunt them for whatever reason, Itsuka will step in, knock him out and apologize for his actions. Although Itsuka criticizes Neito quite heavily, Neito never seems to have any animosity, indicating the friendly atmosphere between them. She also seems to enjoy teasing Neito. She turned him in during the scavenger hunt for being a perverse person and taunted him about making enemies with Katsuki while patting his head.
Itsuka decided to let Tetsutetsu's team participate in the tournament event of the Sports Festival as her replacement, feeling that they deserved the opportunity more. She notes that Tetsutetsu is aggressive and overzealous, but does not seem to think that these are necessarily bad things. Tetsutetsu also seems to value Itsuka's well being. The two appear to be on good terms, and unlike with Neito, the two have not been seen arguing or fighting or criticizing each other, indicating that their relationship is calmer than the one she has with Neito.
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. 
- In the First Popularity Poll, Itsuka ranked 13th, which currently makes her the most popular character in Class 1-B.
- Itsuka likes black coffee and motorcycles.
- According to the author, Itsuka is very popular among his staff.
- In the anime, Itsuka came in 5th place for the Entrance Exam with a score of 25 Villain Points and 40 Rescue Points.
- (To Mustard) "Carrying a gun around is just another way of saying you've got no confidence in a fight. Because at least us simple minds at U.A... Have grown beyond the point of ever thinking there's no hope!"