Cosmagenic

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Cosmagenic refers to systems who have headmates who originated from other planes of existence, universes, timelines, realms, etc. This can be both traumagenic and endogenic in origin, as headmates could appear for various reasons (ex: stress, a call for help, wanting to shift realities, etc.)

This term can also mean a system formed by means of reality shifting/hopping, and bringing back people from those realities with you who then become headmates.

Related Terms
Walk-in can mean a headmate who comes from another timeline.

Pariogenic is an origin referring to having come from another timeline.

Gateway systems may consider themselves to have headmates from other timelines.