Which disorder includes the presence of as many as 100 distinct personalities?

Dissociative identity disorder (DID) is characterized by the presence of two or more distinct personality states or an experience of possession. Each of these identities may have their own name, history, and characteristics, leading to the potential for a person to exhibit a wide range of identities or "alters." In some instances, there can be a significant number of distinct personalities—up to 100 or more in extreme cases. The disorder often arises as a response to severe trauma, typically during early childhood, and is a way for individuals to cope with overwhelming stressors by compartmentalizing their experiences into different identities. This mechanism allows them to create a sense of self-preservation amidst difficult emotional states.

Dissociative amnesia primarily involves the inability to recall important personal information, usually following a traumatic or stressful event, but it does not include distinct personality states. Dissociative fugue involves sudden travel away from home or customary work locations with inability to recall one's past, and while it involves dissociation, it does not feature multiple identities. Dissociative trance disorder is characterized by a temporary alteration in consciousness or identity, but does not equate to the multiple personality states found in DID. Thus, the defining characteristic of DID as involving