My Hero Academia follows the story of Izuku Midoriya, a young boy who under the tutelage of Japan 's number one hero, aims to become the world 's greatest hero, while the spin-off series, My Hero Academia: Vigilantes, follows the vigilante Koichi Haimawari as he works with other vigilantes to put a stop to villains and criminal organizations.
Izuku Midoriya (緑谷 出久, Midoriya Izuku) / Deku (デク)
Voiced by: Daiki Yamashita ( Anime and Vomic) (Japanese); Justin Briner (English)
Nicknamed Deku (デク) by his childhood friend Katsuki Bakugo, based from the Japanese term meaning " good -for-nothing." The English dub makes it an anagram for "Defenseless Izuku". Izuku is a quirkless boy who is extremely knowledgeable about heroes and dreams to be one himself like his idol All Might, despite being one of the roughly 20 percent of people born without a Quirk. But upon meeting the hero while stepping in an attempt to save Bakugō from a villain, Izuku is chosen by All Might to become the ninth holder of One For All (ワン・フォー・オール, Wan Fō Ōru), a Quirk that stockpiles the user's physical strength and unleashes it as a powerful smash, which can also be passed from one person to another. Its existence is kept secret to prevent chaos. After training his body to receive a fragment of One For All, labeled as " Super -Power" thanks to a loophole in the registry system. Izuku initially can only handle five percent (5%) of the One For All's power due to the severe damage it causes his body. Mostly, he fractures his hands and his arms from using his quirk.