Don't let yourself be motivated by personal grudges. We heroes don't have the authority to make arrests or dole out punishment. It's only because of advances in Quirk regulation that we can use our Quirks at all. But vigilantism is strictly against the rules. And if you're caught going off on your own, that's considered a major crime.
Masaki is a man with messy brown hair and black eyes. His hero costume consists of a blue and white, skin-tight, long-sleeved shirt that tucks into his orange gloves. He wears dark pants, white boots, and sports a signature helmet that features a fish-like fin and blue visor.
Manual has a very kind, attentive and ordinary personality. He has an inspiring attitude, as he wants to become a role model for all modern heroes and can complete any tasks simply. In the extras, it is revealed that Manual chose Tenya Ida because he feels similar to Tenya. He also has a very keen mind and could figure out the reason that Tenya chose his office was to find Hero Killer: Stain.
Unnamed Water Quirk: Masaki's Quirk allows him to control water. During the Paranormal Liberation War, he was shown being able to control the eye drops of Eraser Head, Helping him use his Quirk continuously without him having a dry eye.
Masaki's stats, according to the Ultra Archive Book
Horikoshi states that he likes drawing Manual despite him being a side character.
Manual's Pro Hero name is not belittling according to Horikoshi.
His surname, Mizushima, is comprised of the kanji for "water" (水,mizu?) and "island" (島,shima?). His first name, Masaki, means "correct/justice" (正,masa?) and "standard/measure" (規,ki?), which can also be collectively read as the term for "normal/regular" (正規,seiki?).
Masaki's Japanese voice actor, Kenta Ôkuma, also voices Ken Ishiyama.
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