People with DID experience themselves as having separate identities known as alters, or alternate identities. Alters take over control of the person's thoughts, body or behavior at various times. Each can function independently. All the alters together make up the person's whole personality.
Functioning almost like an entirely separate person from the Host (primary) Personality, alters can have different names, genders, ages, and preferences. The variations of alternate personalities are endless and can even take non-human forms.
Alters will take on different roles within a personality system including, but not limited to: