Eve Yesterday

Noah's mother-like creator. A scientist who keeps bringing up "fixing her own mistakes".
Capable of posessing others via mysterious means, giving her full control over their body, always indicated by putting on a hair tie.
Ultimately revealed to have destroyed the world multiple times before using a program implanted into all demons which activates when civilization progresses too far. She keeps creating cyborgs in hopes one of them will finally defeat her one day and stop her from recreating the world ad infinitum.