Is a disorder in which a person displays characteristics of two or more distinct personalities.

The answer is "Dissociative identity disorder".

Dissociative Identity disorder refer to an mental issue described toward in any event two different and moderately continuing identity states. There could make as a number concerning illustration 100 personalities or more, most patients show regarding 10 to 15 personalities which are different with each other. There may be often issue recollecting sure events, past the thing that might make clarified Toward standard absent mindedness. 
It is also called as multiple personality disorder and often caused by physical, emotional and sexual abuse.