Split Personality

This character suffers from split personality.

Dissociative identity disorder is a psychiatric diagnosis that describes a condition in which a person displays multiple distinct identities or personalities (known as alter egos or alters), each with its own pattern of perceiving and interacting with the environment. The victim may or may not be aware of the existence of the alternate personality.

Notes:
1) Do NOT confuse this with Pretending, in which the character is intentionally creating a "fake" persona, to hide his identity and is in full control of it.
2) Do NOT confuse this with Hypnotism (i266 & i270) or Mind Control (i488 & i271) since they are not creating new personalities, they are imposing someone else's will on the character at most.