Co-fronting

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Co-fronting is when two or more headmates are fronting. This can result in them having to coordinate actions, or for their personalities to blend together.

Related Terms
Co-conscious is when two or more headmates are active at a time, which might not be the same as those currently fronting.

Possession (used primarily in the Tulpamancy community) is when the fronter is handing control (of some or all body parts) over to one or more other headmates while staying in front. This is a form of co-fronting.