Bonbu is an ex-Defense Force soldier who is an acquaintance of Makina. He helped Makina in overthrowing Tamaki and destroying Deadman Wonderland. "Bonbu" is a nickname that sounds like "bomb," directly hinting to his speciality, bombing. His real name is unknown.
(Source: Deadman Wonderland Wikia)
Content compiled by AnimeList.moe from publicly available sources.
