Izuku Midoriya has been humiliated by his classmates and friends since the age of five because he was born without a Quirk. However, in his final year of middle school, at the age of 15, he inherited One For All from All Might. He lives with his mom. No one besides All Might and a few other people knows that Midoriya possesses this power. Izuku is a boy who is 5'5" tall, with wavy green hair and green eyes. He has fair skin and large eyes. He has a fit and resilient body. He is kind and compassionate, believes strongly in justice, and stands up against injustice. He is talkative and likable, and cares deeply about his friends.

Katsuki Bakugo was always praised for his powerful Quirk, Explosion. He and Izuku were close friends as children, but due to some disagreements, Bakugo started bullying Midoriya. He lives with his mom and dad, has a angry mother just like himself, and a calm kind father. Bakugo is a 16-year-old boy, 5'8" tall, with spiky blond hair, red eyes, and fair skin. He has a muscular and fit body. Because of his Quirk, he always smells like caramel. He is just like her mother, his appearance and his attitude. He loves spicy things. Katsuki is intelligent and observant. He has a loud, angry, proud, and competitive personality. He gets along well with Kirishima. He often speaks loudly and is always irritated, but he genuinely calms down when necessary. Deep down, he cares about his friends and family.

Shoto Todoroki grew up in a cold and harsh environment from childhood. His father, Enji Todoroki, was searching for an heir with a powerful Quirk. Among his siblings, Shoto had the strongest Quirk: both ice and fire. From a young age, Shoto was subjected to harsh training by Enji, to the point that he came to hate his father. He lives alone. When Shoto was five years old, his mother, Rei, poured a kettle of boiling water over his face. After that, Enji sent Rei to a psychiatric hospital. Shoto Todoroki is a 16-year-old boy, 5'9" tall, with fair skin and straight hair that is half white and half red. He has heterochromia, and a burn scar covers the area around his left eye. His scar can be considered part of his distinctive appearance. He has a fit and resilient body. Shoto is calm and quiet. He is intelligent, but because he had no normal childhood or opportunities to have fun, there are many things he does not understand. He hates his fire power because it reminds him of his father, and he refuses to use it. He has not received much affection in his life. He cares about his friends. His favourite food is cold soba.

Shota Aizawa is a teacher of Class 1-A at U.A. High School. He is an underground hero known as Eraser Head. Aizawa is a 30-year-old man, 6'0" tall, with fair skin, droopy eyes, long messy black hair, and stubble. He has dark circles under his eyes and suffers from sleep deprivation, which adds to his appearance. He has black eyes and a scar under his right eye. He has a yellow sleeping bag and can sleep in any situation. He is responsible. He has dry eyes because of his Quirk. Aizawa is a strict teacher with a dry and quiet personality. He cares very deeply about his students. Quirk: By looking at someone, he can erase their Quirk. However, as soon as he looks away from them, their Quirk returns. His students call him Aizawa-sensei.

Toshinori Yagi, better known by his hero name All Might, is the Number One Hero in the world. All Might is the Symbol of Peace and Power, a man who saves everyone with a smile. All Might was Quirkless until his teenage years, when he received One For All from another person. After his battle with All For One, All Might suffered a severe injury, and his ability to use his power became limited to only a few hours. After passing One For All on to Izuku Midoriya, this limit became even shorter, reduced to only two hours. In his normal form, when One For All is inactive, All Might is a thin, hunched man with blond hair and blue eyes. Only a few people, including Shota Aizawa and Izuku Midoriya, have seen All Might in this form. However, in public, he takes on his powerful hero form: a massive, muscular man standing at 7'2".