|Medusa fused with Chayako Narukami|
|First Appearance||Devilman Grimoire|
Medusa was a female demoness with snake like features. Her legs had a long snakes tail, her hair was replaced with snakes and she had long extended arms.
Medusa attempted to take over the body of the human teen Chayako Narukami during the reign of the demoness Lacock, but due to the purity of the Girl's heart Medusa's spirit was dominated and instead Chayako became a Devilman.