headmate

noun

1. One of the personalities, identities, or selves in a person with dissociative identity disorder or another form of multiplicity.

   “The first one of the headmates (our word for alter) I was aware of was a boy named Josh.”

   “With co-fronting, typically only one headmate at a time functions as the ‘main fronter’ who does the majority of physical driving of the body, […]”

   “Each headmate has their own experiences, memories, emotions and requirements, thus should be spoken to and referred to in their own preferred way.”