Violence Jack

Half-man, half-giant; Jack is large and incredibly strong and wields a large jack knife. Jack scours the underworld and lends his strength to good causes, protecting the weak and bringing justice to the post-apocalyptic world. Violence Jack is a giant, 10 to 12 ft seemingly unstoppable inhuman man, who after been uncovered from under some rubble, wanders the wastelands of a destroyed post-apocolyptic Kanto, which had been destroyed by the "Great Kanto Hellquake". Kanto is now ruled by a psychopathic, samurai warlord named the [url=https://myanimelist.net/character/29258/Slum_King?q=slum%20king]Slum King[/url], who quickly becomes a rival to Jack and the two clash multiple times. Jack fights several other enemies throughout the manga and OVAs. [spoiler]It was later revealed in the manga that he was the reincarnation of Akira Fudo/Devilman.[/spoiler] [spoiler]In CB Chara Go Nagai World, it is revealed that Jack is Akira Fudo (Devilman) after his battle versus Satan.[/spoiler] (Source: Wikipedia, Go Nagai Wiki)