Talk:Vol.2 Ch.179: 38F - Hell Train: The Dallar Show (8)/@comment-24266041-20151208005136

Multiple Personality Disorder: commonly known as DID.

"Dissociative Identity Disorder (DID) is a severe condition in which two or more distinct identities, or personality states, are present in—and alternately take control of—an individual. The person also experiences memory loss that is too extensive to be explained by ordinary forgetfulness." (Psychology Today)

It happens from childhood trauma or other issues.