He eats Chuck Norris for breakfast.
He eats girls out. Literally!
Amon (アモン) is a powerful Demon, and the source for Akira's demonic abilities. With incredible strength and fighting prowess he is known as the God of War in Hell.
Silene was Amon's lover, but Akira ruined that for her. During a Black Sabbath ritual led by Ryo Amon tries to take over the human Akira Fudo, but due to his pure heart Amon's consciousness was surpressed and Devilman was born.
Devilman Live-Action Movie
Here's where things get weird.
Sperm cells the size of basketballs!
Yes. All we get in the entire movie is a sperm cell known as Amon. It wiggles inside Akira and impregnates him.
CB Chara Go Nagai World
In here he follows the Devilman manga canon but appears to look more like the 70s tv version of Devilman(and even shares hisa voice actor as kind of an in-joke/reference to that series). He meets Psycho Jenny and is flashed by the demons powers to be sent into Akira Fudo as part or Satan's plan. nIt says his soul was sent into Kaim but that conflicts with other mangas and animes (though this was created before those).
Demon Lord Dante
Ryo Utsugi mentions him on page 296 of the 70s manga when asking Medusa if he(and 7 other demons)are still alive(to which she replies "yes".