Katsuma Shimano

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

Appearance
Katsuma is a young boy with brown eyes, curly, light brown hair, and a small patch of 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 also carries a small, yellow messenger bag that has a pin of the Pro Hero Edgeshot's face fastened onto the strap. Additionally, Katsuma sports a bracelet with a floral charm on his left arm like his sister, along with a large sun hat which has a blue band 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 has an admiration of Heroes and openly wears an enamel pin of Edgeshot on the front of his satchel along with dreaming of growing up to become a hero himself one day. Despite this admiration, Katsuma is still easily influenced by his sister and disrupts the Class 1-A students from performing their duties. However, unlike Mahoro, Katsuma understands his wrongdoings and even takes the initiative to apologize to Izuku Midoriya 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 Katsuki Bakugo. Feeling indebted to the students for saving their lives, Katsuma heals their wounds while almost narrowly passing out. As the students 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.

When Nine holds Mahoro captive, Katsuma bravely charges at him and demands he release his sister, despite knowing that his Quirk would be stolen; however, he is saved by Izuku and Katsuki. After the events on the island pass, 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, Katsuma's eyes seen shining with admiration as Izuku wishes him good fortune in his journey to become a hero.

Quirk
Cell Activation: Katsuma's Quirk allows him to stimulate and speed up the activity of cells in the body of anyone he touches. This allows him to heal a person's wounds, as well as improve their physical performance. Using his Quirk drains his stamina and he will become very exhausted if he uses it for too long.

It is implied he can use his Quirk on himself as well. 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 contains the kanji "島" (shima, lit. "island") and "乃" (no, lit. "whereupon, accordingly").
 * Katsuma shares multiple similarities with Tenko Shimura as a child:
 * Both have short, curly hair.
 * Both of their last names start with "Shim".
 * Both have/had older sisters who wear their hair in pigtails, Mahoro Shimano and Hana Shimura respectively.
 * Both dream/dreamed of becoming a hero.
 * Both have/had a family member that never liked heroes and neglected or abused their dream of becoming a hero, Katsuma with his sister Mahoro and Tenko with his father, Kotaro Shimura.
 * Both have at least one dead family member.
 * Both were actively targeted by a villain with an All For One Quirk. Katsuma was targeted by Nine for his Cell Activation Quirk while Tenko was targeted by All For One himself to be groomed into becoming a villain as an insult to Nana Shimura.
 * Katsuma also shares many similarities with Izuku Midoriya.
 * Both have a strong desire to be a hero and either secretly/openly look up to them.
 * Both were negatively impacted because of machinations surrounding All For One. Katsuma's father lost his Quirk due to Nine taking it from him. While Izuku became a target for the evil mastermind's endeavors and developed a severe loner complex to keep those around him safe.
 * Both are soft spoken kids with good hearts and honest, if albeit reserved, demeanors.
 * Both sport freckles but in differing quantities which reflects some inversions of personality. Katsuma's are sprinkled inward over his nose signifying a more quieted disposition. While Izuku's are set outward on his cheeks showing a more extroverted character.
 * Both have similarly unruly looking hair, Izuku's used to be shorter when he was young.
 * Both either are or were actively targeted by a villain with an All For One Quirk. Katsuma was targeted by Nine for his Cell Activation Quirk while Izuku is targeted both by Tomura and All For One due to possessing the latter's sibling Quirk counterpart; One For All.
 * Both have/had been ridiculed to varying degrees for their love of heroes. Katsuma by his sister Mahoro and Izuku by mostly everyone in the past.
 * Both find inspiration to be heroic through individuals whom uplifted their spirits and empathic nature.
 * Despite sharing a similar personality with Izuku, Katsuma actually shares his ideal of heroism with Katsuki Bakugo, wanting to be a hero that can defeat the bad guys. Izuku even alludes to this connection when he references All Might's talk of winning and saving.

Quotes

 * (To Izuku) "I'll get stronger! I promise you I will! I'll get strong so that way I can protect Daddy and Mahoro! And then I'll be a cool hero like you and Bakugo! One who always wins no matter the odds!"