Kaito is a trickster who likes to pull pranks on unsuspecting people. Most of which are harmless, but he does not hold back against teachers. He can be really creative and unpredictable, which can be applied to his own quirk and achieve its full potential. He thinks highly of his quirk, often brags about it in a teasing manner. Ironically, he has never told his parents about his quirk. He is confident that no one would be able to catch him. Except by a teacher of course, thus in the end he earns a trip to detention.

Aside from the pranks, he is genuinely friendly to other students, but rather hostile and rebellious towards teachers or adults in general. He simply does not trust any one of them. He has a tendency of doing things on his own and acts selfishly when it came down to searching for his sister's whereabouts. Which leaves him prone to being manipulated if he is pressured into believing his goal is within his grasp.

When it comes down to fighting or any sport really, he can become rather competitive and aggressive the longer it drags on. His reflexes are insanely good, possibly the best trait he has to compliment his teleportation ability and his strength follows closely behind. Although, he can be easily outmatched by someone with a quirk which increases their defenses or an attack which would knock out a normal person, Kaito himself won't fall so easily because he is not normal.

Kaito has lived in Tokyo for about a year after he ran far away from home in search for his twin sister. They were separated at birth, after an unknown villain supposedly kidnapped her. He wasn't told about it by his parents until he was older, but always felt he had some kind of connection to his long lost sister. The day before he left his home, he saw a news report about mysterious kidnappings in Tokyo. The victims were newborn babies who were already born with their quirks. This got him into thinking that his sister was most likely targeted for that reason. Although Kaito is a twin, his sister was actually born with her quirk while his did not manifest until age four. With both of his parents quirkless and having his own quirk being kept a secret from them, Kaito selfishly decided he was going to take matters into his own hands.

When Kaito first arrived in the city a year ago, he was endlessly searching for his sister day in and day out. This went on for a couple of days before he realized that he couldn't really survive on his own. So he did small jobs for the locals and occasionally got his hands dirty until he got some connections which allowed him to attend school regularly under a new name. The short time he spent with criminals made him distrust adults and begun to hate himself for doing their kind of work. Although, he did receive useful information on the one is looking for.

In preparation for fighting his greatest enemy, he has been focused on developing his physical and combat skills throughout most of the year. Before he left home, he regularly attended mixed martial arts classes for the quirkless since he was young. With his own quirk being kept under wraps at the time, he managed to advance up to a level where quirks were allowed during spars. His physical condition was slightly above average, just enough to be at the lowest rank in the quirk level without relying on his own. Now that he is under a new identity, this gave him the opportunity to freely use his quirk during class, placing him within the top ten of his class at 6th place in such a short time.

The reason he chose Kosei Academy is to become strong enough to capture his target villain and find his sister. His MMA classes do not really focus on refining individual quirks, but on how to utilize them within the rules of the octagon. It is not enough for him to accept that, if he wants to go all out then attending Kosei Academy will do that. He does not really care about being a hero or anything like that, if Kosei Academy can help him achieve his goals then so be it. If not, then he is willing to turn somewhere else.

A teleportation quirk which can be used on himself or anything else he touches, including people. However, the maximum weight he can teleport is 344lbs/156kg, which just so happens to be two times his own weight. If he tries to teleport anything beyond his weight limit then nothing will happen. Additionally, he needs to see the location where he wants to teleport. Teleporting through memory requires intense concentration to get the precise location. The maximum distance he can teleport is within a 25 meter radius.

Every time Kaito teleports, his stamina decreases. So, he can eventually pass out if he teleports beyond his limit. His stamina can affect the amount of time it takes to teleport, only if he is teleporting anything greater than his own weight (172lbs/78kg). The teleportation process is instantaneous, even if he is low on stamina, on the condition that if he is teleporting either himself or objects less than his own weight. Any object greater than his own weight will cause some delay which will gradually increase the closer he gets to his overall weight limit and will factor in the status of his current stamina.

Iccho is rather stern and always looking to take charge of a situation. The reason he wants to be in charge because he feels others will screw up. He fully believes in his capabilities and is slow to trust others in basically every way. This belief that he has the right to be in charge can lead to others feeling Iccho can be abrasive, and that is a kind word for it. He realizes this flaw in himself, but it is rather difficult to overcome.

His biggest fear is failure, so he tries his best to succeed in everything he does. This is not realistic and it causes him to take failures a lot harder than he should. This leads to an over competitive “spirit”. He pushes himself and others to the point of breaking. He has the capability of being a strong and good leader, but he has many personal flaws that he needs to work on to reach his potential.

Iccho was born and raised in Tsushima, Nagasaki. This means that the whole new world of Kosei Academy will be a whole new experience for Iccho. His father was a fisherman and his mother worked as a school teacher. Iccho idolized his father and how strong he was. When Iccho started to develop his quirk, it was a natural fit on a fishing boat. It is a lot easier to transport fish when they have been paralyzed. He started to go out on his father’s ship, so Iccho has the strength of a fisherman. He works out every day to reach his father.

However, all changed when his father’s boat was destroyed in a storm created by a super villain. His father took his ship out into the storm to help save a ferry that was caught in the storm. Iccho saw how brave his father was and this inspired Iccho to pursue being a hero. His mother did everything she could to push Iccho away from being a hero, but it was to no avail. Iccho had a group of friends who would help solve problems around the city, but they grew apart when Iccho wanted to take it more seriously and his friends wanted to just have fun.

When his friends abandoned him, Iccho became determined to become a real hero just like his father was. His first option was obviously U.A. High, but he was not able to pass the entrance exam due to his stubbornness when it came to working with others. He did not want to just go into general studies, so he decided to apply to Kosei Academy. It was a new school, and Iccho got into the hero course. He knows that he has to change his ways if he wants to become a hero, but it is hard to trust others when everyone he trusts have abandoned him.

His body hair can accumulate a large amount of keratin, so his body hairs become sharp quills that can come out of any pore. They are currently only able to be rather small, about 3 inches (7.62 cm). He is able to remove the quills and throw them towards his enemy. Iccho can only recuperate his quills about 4 times in a short fight. This limits his ability to throw quills, and how he can defend himself.

The quills also have a slight paralytic poison on the tips that paralyze a small portion of a human’s body (i.e. if a person gets hit on the upper arm then their upper arm will be paralyzed). The poison is currently not potent enough to spread far in the body or cause major organ failure. Iccho has been able to build up an immunity to his poison over time, so he is not affected by it whenever his body secretes it.

Eir is a timid girl that doesn't like to stand out in a crowd. She enjoys the solace of silence rather than the company of others more often than not. Hayashi lacks confidence; she constantly questions her abilities, and whether or not she can measure up to the standards expected of her. Eir is far from the ideal hero. She's cowardly, uncertain and unable to stand up for herself. Her introverted nature usually leads Eir to having few friends. If it was for her to decide, Hayashi would never have signed up for the hero course at Kosei Academy. She'd much rather focus on her true passion: art. Eir had always had a natural talent for drawing. Since the teen has a tendency to bottle up her emotions and not share how she feels with others, Eir uses her art as a means of expressing herself. Whenever she isn't rigorously studying to become a better hero, Hayashi is probably working on her next sketch. Eir realizes she isn't living for herself, but doesn't have it in her to change anything about the direction her life is taking.

Eir Hayashi was born in Kanuma, Tochigi to Teruo and Shoko Hayashi. Teruo, her father, was the physics teacher at a local high school. Her mother ran a general store in town. Teruo had always wanted to be a hero. It was his dream since he was just a boy. He had idolized the profession and those that took it upon themselves to become superheroes. Teruo had tried to become one himself.
But alas, his quirk was near useless for hero work; he could know the answer to any equation he wrote down using a number two pencil. A fine skill for a teacher, but one Teruo could never make use of in his desired profession. Devastated by his own personal failure, Teruo tried to live out his dream through his only child, Eir Hayashi. Her quirk manifested when she was three, when Eir fell thirty five feet straight down into a pit and survived the fall unscathed- albeit, the little girl had been covered in bone-like armor when the authorities retrieved her. Her father was overjoyed when she was returned to his arms. Not because she was alive, but because of the fantastic quirk his child had. The man quickly set her path in stone: she was to be a hero, and nothing less would satisfy her dad.

She felt the pressure of Teruo's expectations throughout her whole life. He pushed her to become what he wanted her to be, shunning anything the child might want for herself as folly. Eir quickly learned to never speak up in disagreement with her old man, because...consequences...always followed. Silent consent was the best way for young Hayashi to avoid the disapproving glare she had come to fear. This defense mechanism leaked into the rest of Eir's life, turning the vibrant child quiet as the grave. She retreated into her shell, finding her only joy in drawing. Even as a child, Eir liked to make pretty pictures. Her wild imagination could be put to the page. Through her pictures, Eir could dream of being something more than her parent's expectations. Eir could be a teacher, an astronaut or a farmer. Or a four headed dragon monster. Whatever she wanted to be, Hayashi could use a pencil or a crayon to make it real.

As time passed, Eir excelled in school. She had an excellent memory, and her parents pushed her to succeed in everything she did. The girl liked to read and study; it gave her an excuse to avoid Tersuo's exhausting 'hero training regime.' That's what he called what could otherwise be described as torture for a middle schooler. Her father tried to turn Miss Hayashi into the perfect example of a human being. He ran her until she collapsed. Pushed her grow her strength until Eir couldn't hold her own arms up anymore. It was cruel, inhumane and nobody did a damn thing to stop Tersuo. Her mother quietly disapproved of the practice. Shoko would sometimes fake that Eir was sick and allow her to stay home with her. She sneaked candy into Eir's perfectly regimented diet. The woman never once tried to stop things, though. Eir didn't know why; she assumed Shoko was just as afraid of Tersuo as Eir was. Eventually, the quiet girl was old enough to send to one of Japan's hero academies. Tersuo tried to enroll her into top schools like U.A High, but Miss Hayashi cleverly sabotaged her own exams. She figured she was far from up to snuff anyway, but it was better to be safe than sorry. Tersuo eventually caught on to her scheme. He punished her for her actions, and then shipped her off to Kosei Academy. Eir had to perform to avoid her father's wrath. She did excellently on the written exam and her performance in the physical exam was satisfactory.

Eir's quirk turns her into a human tank. On command, the girl can create bone-like armor. Forming it takes only a split second, and she can hold it there for upwards of an hour before she has to break the carapace and recharge. Hayashi's armor is quite heavy, especially for someone of her size; wearing it slows her down considerably. Eir can't move at all while wearing the full suit, leaving her vulnerable to any area of effect attacks unless she wants to anchor herself to one spot. Once Eir has shed a part of her shell, she can't reform it on that same spot for roughly ten seconds. Her carapace, while extremely durable, can still be cracked and destroyed. Eir isn't able to reform a broken shell for hours.

Hayashi's special move is Knuckle Duster Buster. She concentrates her carapace around her fists, forming two bone-like knuckle dusters. Eir's otherwise underwhelming punches become a dangerous threat to anyone that gets too close to her. It's her only true offensive move, but Hayashi can use it to great effect against any opponent that underestimates the power behind her tiny fists.