Jigo

Jigo is a character from Princess Mononoke. He is portrayed by Billy Bob Thornton in the English version. He first appears as a protagonist, but is later revealed to be an antagonist, wanting to present the Forest Spirit's head to the emperor so that he could be paid handsomely. He was last seen fleeing after giving the head back.

Alignment
Jigo was a good guy with Ashitaka and later revealed to be an evil antagonist