If you're looking for manga similar to Ichi the Killer, you might like these titles. All recommendations are made by Anime-Planet users like you!
Meet Eiji Bando, a deranged, hentai manga-reading psychopath with a penchant for gunning people down. As a hitman, he works for the yakuza, causing plenty of collateral damage wherever he goes. Whether he’s joking about violating his male peers or just blowing people to bits, Eiji Bando always has plenty of disturbing fun in the process!
Amamiya Kazuhiko is a detective who, after seeing the torture and subsequent death of his girlfriend, tracks down the man responsible for her death. Upon meeting the killer, Amamiya's psyche breaks and a new personality, the cold-blooded, arrogant psychopath Shinji appears and kills the murderer. More personalities materialize from Amamiya as he tries to investigate a string of murders years later. As he investigates, an intricate conspiracy plot begins to tangle up both Amamyia and Shinji as well as those around them.
Common themes in Ichi the Killer and MPD Psycho are: