Zuboo was a demon only seen in Amon: Apocalypse of Devilman OVA. He changed form many times and had highly psychopathic behavior.
Amon: Apocalypse of DevilmanEditZuboo is first seen near the beginning chasing down the young Devilman Yumi, whilst disguise as a salaryman. He corners her and reveals his demon form, but he is almost immediately ambushed my Miko another Devilman.
Zuboo changes form and quickly gets back on his feet and starts to smash Miko against the wall, he then prepares to sodomize her but Akira slowly walks up and punches him in the face knocking him down. Enraged Zuboo changes form again into a large ball and tries to run Akira down. As he charges into him, Akira grabs Zuboo and spins him around, then he absorbs Zuboo into his fist, ultimately killing the demon.