Aku Aku - Crash Bandicoot

Long ago, Aku Aku was once a powerful human shaman who used his magic to fight against evildoers, particularly his villainous brother, Uka Uka. At some point, both of them left behind their mortal shells and their spirits came to inhabit ancient tribal masks, effectively making them immortal. Afterwards, Aku Aku was able to imprison his brother within a hidden temple to protect the world from his evil, and then went into hibernation himself for unknown reasons.