Jinmen is a devil with a turtle like shell. However, the shell has the faces of all the humans he's ever consumed. Instead of killing them, they remain alive as a part of him. In the manga, Miki's niece, Sachiko, falls victim to Jinmen. In the OVA, it is Akira's mother. In Devilman Crybaby, he is Akira's father which also consumed Akira's mother.

Jinmen appears at the beginning of the first OVA with a similar design to his appearance in the manga, but was later changed in the second OVA. His fight against Akira in "Cyborg 009 VS Devilman" is the most accurate version of their confrontation in an adaptation.