Mina is cheerful and most of the time seen with a smile on her face. She is easily excited, but also very emotional and easily brought to tears in various situations, out of relief, out of sadness and out of frustration. However, she is still very easygoing, having no problem being completely naked in front of other people, however she still doesn't appreciate being peeped at by Minoru Mineta.
Mina is also very sociable and eager to engage in social situations, and is shown to become very upset when she is denied an opportunity to be at a gathering or event she looks forward too.
Mina's skin is tinted a pink color due to her acid quirk. Her eyes are dark with yellow irises. She has unruly, short pink hair with yellow horns protruding from her head. She is of medium height and set more broadly than some of her other female classmates.
During school hours she wears the normal female school uniform. Her hero suit consists of a purple and turquoise camouflage skintight body suit and a tan jacket with white fur on the collar. She wears a white mask as well.
Mina was seen with other students getting on the bus to head for the park for their training. Upon arriving, they were attacked by villains and got separated. Mina fought until All Might arrived and, upon seeing him, she started to cry. After that experience, All Might commented that those who are in Class A will be great heroes.
Mina places 19th in the Obstacle Race, allowing her to participate in the next event, the Human Cavalry Battle. She teams up with Katsuki, Eijiro, and Hanta. After Neito takes her team's headband, Katsuki states that they will beat them before going after Izuku.☃☃ Mina and her team battle Neito's team but Neito rebukes their efforts. After Katsuki grabs two of Neito's headbands and Hanta, Katsuki still wants more points and orders his team to attack; having Hanta use his Quirk and has Mina use her dissolving fluid. Eijiro and his team ride on Mina's fluid to reach Neito's team faster thanks to Hanta reeling in his tape. Katsuki attacks Neito for the final time and grabs his last headband, which places their team at second place. Katsuki, however, wants to collect the ten million point headband and Mina goes with her team to where Izuku's team and Shoto's team are. Mina and her team reach their destination, but the Human Cavalry Battle ends before they could do anything. However, Katsuki's last minute actions allowed Mina and her team to reach second place, allowing them to participate in the final event. Tsuyu congratulates Mina for qualifying for the next event, but Mina states that Katsuki added her to his team as an answer to Shoto's ice and has doubt whether she can match up with their strength.
After Denki and Minoru state that the girls must do the cheering battle as per orders from their homeroom teacher, Mina and the other girls of Class 1-A walk out in cheerleading outfits. However, as Mina and the girls walk out, they realize they have been tricked. When Mashirao decides to resign from the tournament event, Mina tries to help him reconsider but it doesn't work. Mina's opponent in the first round of the tournament is Yuga Aoyama. During the recreational events, Mina is seen cheerleading.
Mina faces her opponent, Yuga, in her first round match. During the match, Mina causes Yuga's belt to malfunction, causing him to panic and, in that moment, Mina attacks Yuga with a one-hit KO to his jaw, knocking him out and defeating him, allowing her to move on to the next round.
Mina faces her opponent, Fumikage, in her second round match. However, Fumikage defeats her, eliminating her from the tournament.
Mina watches the match between Fumikage and Katsuki. She cheers for Fumikage.
Mina along with her class watches the closing ceremony of U.A.'s Sports Festival.
Two days after the Sports Festvial, Mina is in class having a discussion with some of her classmates. During the Hero Informatics, Class 1-A have to decide on their Hero names. Mina writes down and presents her Hero name: Ridley Hero Alien Queen (リドリーヒーロー エイリアンクイーン Ridorī Hīrō Eirian Kuīn?). However, Midnight tells Mina to change her name, finding it to be uncreative. Afterwards, Mina changes her Hero name to Pinky (ピンキー Pinkī?).
After Class 1-A is finished formulating their Hero names, Mina is given a list of 40 workplaces in order to choose a workplace that she wants to train at. Mashirao talks to her, noting that she should have more nominations because she put on a good show in the Sports Festival. On the day of the workplace training, Mina is at the train station with her class so that she can travel to the workplace of her choice by train.
The workplace training comes to an end and Mina returns to U.A.. In Class 1-A, Mina talks to Tsuyu and Kyoka about their workplace training. During Foundational Heroes Studies, Mina along with Izuku, Tenya, Mashirao, and Hanta are the first group to partake in the rescue training race. The race begins and Mina uses her Quirk to maneuver around the construction site and eventually completes the race. All Might commends the group for improving their Quirks broadly since entering U.A. and asks them to prepare for the end-of-term test.
After Foundational Hero Studies is finished, Mina is in the girls' locker room and changes into her school uniform. Mina becomes annoyed that Minoru tried to peek on her and the other girls.
Mina and Denki admit that they haven't been studying due to the many events that have taken place throughout the semester. Back in class, Izuku reveals the content of the exercise test to the class, much to Mina and Denki's happiness; Mezou notes that they are happy because they don't have to adjust their Quirks for real life opponents.Throughout the final week before the end of term test, Mina studies under Momo's tutoring along with Denki, Kyoka, Hanta and Mashirao. On the day of the exercise test, Class 1-A is Shota says that without a doubt they have some knowledge on the exercise test, to which Mina and Denki exclaim that it will be fighting against robots. However, Mr. Principal bursts Mina and Denki's bubble by revealing that they will be fighting against U.A.'s teachers for the exercise test. Mina is paired with Denki and they must fight Mr. Principal in their test exercise.
Mina, Denki, and Mr. Principal arrive in an uninhabited city where Class 1-A's test exercise will take place. In the city, Mr. Principal explains the 30-minute test; Mina and Denki must either handcuff him or one of them must escape the battlefield within 30 minutes in order to win and pass the test. The test begins.
Denki and Mina struggle against Nedzu who has commandeered a wrecking ball and uses it to block off the roads leading to the escape gate.
Denki and Mina are unable to get to the escape gate or handcuff Mr. Principal and as a result, they fail the practical test.
Back in class at U.A., Mina is crestfallen that she is unable to go to the forest lodge due to failing the practical test. Soon, Shota enters the classroom and informs Class 1-A that all of them are going to the forest lodge which will be a boot camp, much to Mina's happiness. However, Mina will be receiving harsher training at the boot camp for failing the practical test. Mina, along with the class, go to Kiyashi Ward Shopping Mall to buy necessities for the forest lodge.
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 isn’t 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 don’t arrive there by 12:30 pm won’t 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. At the hot springs, Mina thanks Kouta for stopping Minoru from trying to peek on them.
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.
As class 1-A arrives at their dorm, Mina is overjoyed at how big their new dorm is. Before the class could enter, Shota scolded Momo, Eijiro, Izuku, Tenya and Shoto for acting as if they had already obtained their temporary licenses. He further more says he would have expelled everyone but Bakugo, Hagakure and Jiro (due to them being captured and hospitalized, respectively) from the school, if it weren't for All Might's sudden retirement and asked them to stick to the rules from now on. Afterwards the class explore their new dorm, which Mina instantly loving the place.
After everyone moved in and decorated their room, Mina suggests that they make a room showcasting competition. Izuku's room is the first on the list. Next is Tokoyami's room, though he resists at first and blocks the door, Hagakure and Mina can shove him aside, though they find his room to be too dark and scary. Afterwards, they look into Aoyama's room, a room filled with lights, discoballs, mirrors and other sparkly things. Mina is unimpressed and simply notes that she expected a room like this. They skip Minoru's room due to his creepy behavior. Ojiro's room is next, though they fail to describe it as anything but "normal". Iida's room was filled with books and a lot of back up glasses, Mina puts one on as joke. The next room belongs to Kaminari, though the girls are mostly unimpressed. As they enter Kouda's room, Mina and Ochako start to fawn over his pet bunny and play with it. Minoru then suggests that the boys get to see the girls' rooms too, which the girls agree to but first they want to continue the tour with Kirishima's room. He doesn't mind though he doubts that the girls will like his room, which Mina confirms. As they enter Shouji's room, Mina is dissappointed at how empty it is. She likes Sero's room though, due to it's traditional asian design. As the group reaches Shoto's room the girls are curious what his room may look like and are amazed by it's traditional Japanese style. The last room among the boys is Satou's room, where a chiffon cake was already baking. He offers the it to the rest of the class which the girls gleefully accept. As she eats the cake, she points out how much of a pluspoint he got for the cake, compaired to Sero. The group then skim through the girls' rooms rather quickly, first Jiro, then Hagakure, then Mina, then Ochako and Momo last, Tsuyu didn't join because she didn't feel well. At the end of the tour the girls decide that Satou won, because his cake was tasty.
The next day Shota announces that Class 1-A will be working on developing their own special moves, much to the class' excitement. The class visits the Gym Gamma, where Cementoss creates a training ground for the class with Ectoplasm using his quirk to create villains for the class to practice their moves on. During the training she tries to fire an acid-hose from her spread palms, however, it doesn't shoot very far, to which Ectoplasm suggests her to place her palms onto each other and shoot the acid out of the gap, which successfully lets her shoot her acid further away. Ectoplasm suggests her to aim at small targets next.
After four days of training, Blood King and class B come to anounce that the Hero Qualification exam will start soon, with Monoma pointing out that half of the people taking the test fail. Later that evening the class 1-A girls are relaxing in the dorm's lounge, asking about each other's progress with their training. When Ochako can't answer about her progress, Mina suspects that she fell in love with a boy. Even though it visibly flusters Ochako, Mina keeps questioning her.
On the day where the Hero Qualification Exam starts, Class 1-A arrive at the test location, along with several other classes from other hero schools. Mina and Sero wonder why the energetic Inasa Yoarashi likes Yuuei so much, since he declined entering the school. She then marvels at the heroine Ms. Joke because she asked Shota to marry her.
Shortly after the exam starts, the first part of the exam involves thinnening out the amoutn of people who can succeed by playing a game, where people put 3 marks on their body and are given 6 balls to throw at the other examinee's marks. Those whose marks have been hit, are disqualified.
As the exam starts, the students of the other schools focus entirely on Yuuei. Mina manages to deflect several with her acid. Two enemy students work together to attack Yuuei, one hardens a bunch of throwing balls, another one throws them underground in an arc, making them shoot out of the ground just before hitting Minoru, however Mina manages to block them once again with her special move "Acid Veil". The Yuuei students are then seperated by Yo Shindo's quirk, that let him create an earthquake and shattered the ground apart.
Mina managed to group up with Minoru, Hagakure and Ojiro during the exam.
As the exam reached it's end, Mina and her group managed to locate Iida and Aoyama, thanks to him firing his laser into the sky. Kouda and Tokoyami also joined and helped their classmates fend off the several enemies. Together all of Class 1-A passed the first round.
Quirk and Abilities
Acid (酸 San): Mina's Quirk allows her to shoot out a corrosive liquid from within her body and can control the degree of solubility, as well as its viscosity. She can use it offensively, but has shown utility as well such as melting handholds for herself to climb with.
- Acid Veil: Mina's special move. By maximizing her acid's solubility and viscosity, Mina creates a gelatinous acid wall that blocks incoming projectiles. Mina's Acid Veil was strong enough to block hardened balls (which were stronger than concrete) with ease.
Acidproof Shoes: Mina wears special shoes that have holes in their soles, that let mina secrete acid from her feet. The shoes aren't damaged by the acid. Mina can use this to slide across the ground on her acid.
They're friends with each other.
Mina and Denki are often seen together. They were also partners during the End of Term Test.
He seems to interact with her more than with his other classmates. She often teases him about his stomach aches as a result of his Quirk and also managed to beat him with ease during the Sports Festival.
- Mina's design during the preliminary stages of the series was relatively similar to her final design, albeit with a lankier physique. This design also possessed longer, more elaborate horns, visible blushes on her cheeks and slightly longer hair.
- Because the twisted horns were considered difficult to draw, this design was eventually dropped, with the current Mina design having smaller, simpler horns.
- Mina is student No. 2 in Class 1-A.
- Mina ranked 9th during Shota Aizawa's Quirk Apprehension Test.
- Mina's surname name "Ashido" is almost homophonous to the Japanese pronunciation of "acid" (アシッド ashiddo?). The first kanji in her given name, "三" ("three"), can be read as "san", which is also the pronunciation of the Japanese word for "acid" (酸).
- Mina's initial choice of hero name, Alien Queen, is a direct reference to Ridley Scott's movie Alien, where the titular creature of the film is an extraterrestrial being that possesses acidic blood.
- Mina's attack-methods and design could be a reference to the Arch-Vile, an enemy from the Doom series of video games.
- Mina's favorite foods are natto and okra. She also likes dancing.
- Mina ranks 19th in Class 1-A's Grades.
- Mina ranked in the Top 8 of the U.A. Sports Festival First-Year Stage.