Dosu-Roku was originally a leader of the gang that attacked Akira Fudo and Miki Makimura at the beginning of the original Devilman manga. However, after a near fatal encounter with the Demon General Zann, he and the rest of the gang join forces with Akira.
(Source: Devilman Wikia)
Content compiled by AnimeList.moe from publicly available sources.
