Koichi Haimawari is a protagonist in the spin-off series 'My Hero Academia: Vigilantes'. Known for his strong sense of justice and admiration for heroes, Koichi operates as an illegal hero under the alias 'The Crawler'. Despite lacking a hero license, he uses his Quirk, 'Slide and Glide', to patrol the streets and assist people. His Quirk allows him to move at high speeds by gliding along surfaces. Throughout the series, Koichi evolves from a timid fanboy into a dedicated vigilante, showcasing significant development in his abilities and character.