Semi-Member

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A semi-member is a headmate in a system, or sisasystem, who does not feel fully-formed but also does not feel like a fragment. It's the in-between state of being more complex than a fragment, but not quite as multi-faceted as a full on headmate.

Related Terms
Demi-member refers to being a partial, but not full, system member, when it comes to absences from the system.