Zennon was a mighty demon lord who served Satan, he had little to do in the OVA series other than provide a foreboding force that would likely have had more to do if the OVA series continued.
Zennon was a massive demon he had massive bat like wings large horns and four faces, one large bat like face on his chest, a black haired man on the right, a blonde haired woman on the left and a twisted demonic face in the center with three eyes.
Powers and AbilitiesEdit
Zennon presumably had the same powers as his manga counterpart, however in the OVA series all he is seen doing is transporting a small army of demons to fight Devilman.
Devilman: The Demon BirdEdit
Zennon was first seen in a nightmare of Akira Fudo's watching him devour Miki Makimura. Later when Sirene is badly hurt in a fight with Devilman she begs Zennon to send help, he does so by sending down a small army of demons as well as Sirene's old friend Kaim.