The light novel, manga, and anime series High School DxD features a diverse cast of characters. The visuals of the characters were designed by Miyama-Zero and their stories were created by Ichiei Ishibumi. The stories follow the adventures of , a perverted high school guy who is killed by his first date, but reborn as a devil to serve Rias Gremory, a crimson-haired school beauty who heads the Occult Research Club (オカルト研究部, Okaruto Kenkyū-bu). Issei, Rias, and the club members interact with various groups and organizations, some of which are run by devils who compete against them in sanctioned combat matches called Rating Games, where the characters have been assigned positions akin to chess pieces.