Observegenic

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Observegenic headmates and systems form spontaneously, directly from watching or otherwise consuming the media that is their source.

Some prefer to further detail this origin, calling themselves spontaneous observegenic, if formed while consuming their source, or long-term observegenic, if formed afterwards.

History
This term was coined during a discussion in the Pluralpedia discord server.

Related Terms
Introjects are headmates that have a source.

Fictives are headmates of a fictional source, and factives are headmates of a non-fictional source.