Katsuma Shimano

Katsuma Shimano (島乃 活真) is a resident of Nabu Island with his older sister Mahoro Shimano in My Hero Academia: Heroes: Rising.

Appearance
Katsuma is a small boy with brown eyes, curly, light brown hair, and a small patch freckles in the middle of his face. He wears a pair of blue overalls with dark blue straps over a white T-shirt, accompanied by light blue sandals. He carries a small yellow messenger bag that has a pin of the Pro Hero Edge Shot's face fastened into the strap and wears a bracelet with a floral charm on his left arm like his sister. He also wears a large sun hat which has a blue scarf on the crown and a light blue stripe on the rim.

Personality
Katsuma is a timid and soft spoken child that is constantly seen following his older sister, Mahoro. Unlike his sister, he is quite fond of heroes and openly wears an enamel pin of Edgeshot on the front of his satchel, he also constantly mentions his dream of growing up to become a hero. Despite his fondness of heroes, Katsuma is still easily influenced by his sister and disrupts the students from performing their duties. However unlike Mahoro, Katsuma understands his wrongdoings and even goes to apologize to Izuku after falsely reporting the sighting of a villain.

Later on after Nine's initial invasion of the island, Katsuma enters the infirmary and pleads to use his Quirk in order to treat Izuku and Katuski. Feeling indebted to the students for saving their lives, Katsuma heals their wounds while almost narrowly passing out. As the student's hold a meeting to strategize, Katsuma selflessly offers to sacrifice his Quirk in order to aid in the capture of Nine but is told by Izuku that he will make sure to protect him.

Towards the end of the film when Nine holds Mahoro captive, Katsuma bravely charges at Nine and demands he release his sister despite knowing that his Quirk would be stolen but is then saved by Izuku and Katsuki. At the end of the film, Katsuma and his sister run down the deck at the harbor and happily wave goodbye to the heroes while thanking them for saving them during the attack, his eyes can be seen shining with admiration as Izuku wishes him good fortune in his journey to become a hero.

Quirk
Cell Activation (細胞活性): Katsuma's Quirk allows him to speed up the activity of cells in the body of anyone he touches. It’s implied he can do this to himself as well.

It can be used to heal a person's wounds as well as improve their physical performance. After prolonged usage, Katsuma can suffer from exhaustion. So far, his Quirk has been shown to work on people with Type O, A, and B blood.

Trivia

 * Katsuma’s given name contains the kanji “活” (katsu, lit. “active”) and “真” (ma, lit. “truth, reality, genuineness”). Katsuma’s last name means island (島 shima).