Jersey the Devil from the short 'Devil's Advokid' where he is the main character, a Demon who cause problem to a mother and her son.

Prompt:

Normal: jersey the devil, 1boy, solo, demon, purple skin, goat ears, yellow sclera, slit pupils, Black pupils, demon horns, dark purple horns, demon tail, black tail, pointed tail, dark purple pointed tail

Possession: jersey the devil, 1boy, solo, demon, possessing a human, possessed human, short hair, ahoge, purple hair, horns, pointy ears, light purple skin, yellow sclera, slit pupils, Black pupils, green sleepwear