|Unnamed Demon Fused with Yumi|
|First Appearance||Amon: The Apocalypse of Devilman|
The demon was a small red tentacled creature with a spiked back, large fish-like eyes and two retractable mouths lined with with long spiked teeth.
The demon was presumably one of the many who went on a suicide run attempting to merge with humans that were perfectly sane causing them to die as their two bodies would refuse each other. However there were some cases were the human would take control becoming a Devilman, one of these people was likely Yumi.