Stain

Controlled by Nezu (Principal) U.A. High School (雄ゆう英えい高こう校こう, Yūei Kōkō?) is an academy that boasts the best heroics education in Japan. It sits atop a forested hill that overlooks Musutafu. Overview U.A. is the #1 ranked high school for heroics and is considered as the top Hero Academy in Japan. Students are separated based on their abilities into specific Departments and Classes - A, B, C, D, E, F, G, H, I, J, and K. As stated by Shota Aizawa, U.A. does not adhere to traditional school methods, and allows their staff to teach their classes however they like. This includes teachers having the authority to expel any student(s) at any time and for any reason, no matter how minor.[1] Furthermore, students who are expelled can be re-enrolled, although the expulsion will still remain on their permanent records.[2]

U.A. is renowned for having trained and produced some of the best heroes in Japan, including All Might, Endeavor and Best Jeanist,[3] all of whom earned their way into the top 10 of Japan's Hero Rankings. Once a year, U.A. holds a tournament called the U.A. Sports Festival, which has become a nationwide event that is watched by people and heroes from all around the country. Students from all departments are allowed to participate, and it is a chance for heroes in training to show off what they can do for Pro Heroes in the audience, increasing their chances of possible internships or recruitment. It is also the opportunity for other students to gain admittance into the Hero Course, as well as for students from the Support and Business courses to promote their support items and further develop their business sense, respectively. Security System At the entrance, there is a security wall nicknamed the "U.A. Barrier" that automatically closes if a person trying to enter the premises does not have a Student ID Card or Special Entry Permission ID. Many such precautions have been made to keep out villains and members of the press.

Chizome was an intimidating, muscular man who walked with a distinct hunch and had a flat, somewhat triangular face without a nose, which he removed himself, and an extraordinarily long tongue tainted with numerous small papillae. He had long black hair, which he wears messily; it would drape over his face if not for his headband and mask. He had small red eyes with tiny irises. Stain had donned a white jacket with oversized sleeves. His forearms were wrapped with bandages, and he wore red gloves, dark navy blue pants, red metal pads around his knees, and black boots with white pads. He had two belts, one black worn diagonally on his torso where he held an old katana, and the other red worn around his waist holding what appears to be a small machete. His face was covered with a tattered cloth, leaving a part of his hair visible, which was tied into a ponytail.

Chizome was a cruel, unforgiving, and merciless man with an indomitable sense of duty to cleanse society of false heroes. He believed that those who become Heroes for fame, money, and selfish motives are unworthy of being called the title and only revered All Might as a true hero. Due to his strong ideology, he took it upon himself to become the Hero Killer: Stain to stain his own hands with blood to purge fake heroes and change the current society. He initially took on the role as the vigilante "Stendhal", where he believed that any who "wielded power without conviction" were automatically sinners deserving of death and used this belief to justify his actions as heroic instead of hypocritical. He was perfectly willing to work alongside villains like Kuin Hachisuka as a means to an end, rationalizing that there was value in villains seeking to exterminate other villains. Even so, he also had a sense of common ground and respect for other vigilantes, such as saving Koichi Haimawari from the Instant Villain Akira Iwako and identifying with Knuckleduster, believing that the latter and he were on the same path of fighting for justice. Despite this, however, he was willing to fight and kill them if they opposed him. Stendhal also appeared to suffer from a split-personality disorder that caused him to view his vigilante and civilian identities as two separate entities (his mental change was signified by whether or not he was wearing his mask at the time)

Enhanced Smell: Despite his mutilated nose, Stain had an extremely keen sense of smell. While confronting All Might in Kamino he was able to memorize the retired hero's scent while in close proximity with him. Later on, during All Might's final battle against All For One, after smelling some stray blood from the fight, he was able to tell through his nose that the blood was All For One's and not All Might's.[5] Enhanced Strength: Stain had considerable strength, as it was enough to slice through many of Shoto's ice attacks cleanly. Immense Stamina: Stain had a high pain threshold, as shown when he takes a direct blow from Izuku's 5% Detroit Smash to the head and remains primarily unfazed. After battling against the trio of U.A. Students and killing the Winged Nomu Overall Abilities: Stain was an extremely dangerous villain who had claimed more lives than any other since All Might's debut. Stain's aptitude allowed him to murder 17 known Pro Heroes and cripple 24 others to the point of being unable to recover fully. Stain displayed creativity and mastery over his fighting style. He was able to deal with both close and long-ranged opponents through misdirection, aggression, prediction, and use of the environment. His battle prowess allowed him to overwhelm his targets in armed combat and compensate for his Quirk's restrictive activation cost.

Bloodcurdle (凝ぎょう血けつ, Gyōketsu?): Chizome's Quirk allows him to paralyze his target upon tasting a sample of their blood. The amount of time a victim remains paralyzed depends on their blood type; in ascending order from shortest to longest duration, they are: O, A, AB, and B. The maximum amount of time that anyone can be paralyzed is eight minutes

Weapon Arsenal: Before being arrested, Stain carried various weapons with him:

A worn and partially damaged katana. Five daggers. Throwing knives. Toe-spiked boots. Folding knives. After escaping from Tartarus, he made with fewer weapons:

A worn katana. A small machete. Throwing knives.