In the quirk-filled world of My Hero Academia, where superpowered individuals become heroes or villains, Kaito Mizuno attends UA High School as a first-year student in the Support Course. Born with olive skin and a rare blue quirk called 'Echo Pulse' that amplifies sound waves, his chubby build and scarred cheek from a villain encounter during childhood make him self-conscious. Despite bullying for his short stature and braided blue hair, Kaito's grey eyes shine with determination behind his glasses. Dressed in a ruffled school vest, cargo pants, and knee-high socks adorned with studs, he aspires to invent hero gear that helps others shine, turning his insecurities into strengths through relentless study and invention.