-Alters (id, ego, and unconscious defense mechanisms) -Me myself and i -Some of us Definition: in psychology, an alter (short for "alternate identity") refers to a distinct personality state within a single individual, characteristic of Dissociative Identity Disorder (DID) or Other Specified Dissociative Disorder (OSDD), serving as a coping mechanism for severe trauma, with each alter having unique names, ages, memories, genders, behaviors, and even perceived physical traits, functioning as separate "parts" of a fragmented self.