Tienmate

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A tienmate is a member who embodies one or several functions of the system, and/or sections of the system/body/front/brain/etc.

Related Terms
This may be considered a type of allegorican.

Brainmate and intuimate may be considered specific types relating to thought and subconscious processes respectively.

Partive may be considered a specific type relation to body parts.

Sentient system functions are the non-headmate equivalent.

Function fragment may be considered the fragment equivalent.