Vervalka was a small humanoid demon who resembled something of a ugly fish. He had large puffy lips with a set of large curved teeth. He had large blank eyes and loose tendrils hanging from his head. He had long spindly fingers as well.
Vervalka was paired with a large set of jaws and sharp talon-like claws.
Vervalka is first seen as one fo the demons sent by Zennon to help Sirene defeat Devilman after she was gravely wounded. He runs at Devilman, alongside several other demons, but is quickly grabbed and slain.
Vervalka is again seen as Akira remembers many of the demons he had fought on Earth as he traveled through Hell with Jun Fudo. Vervalka could be seen in a large group shot alongside Aleda, Ghelmer, Sirene and other demons.