Brainmate

Not to be confused with brainmade, a term for non-sourced headmatesundefined:

A brainmate is a system member that is a personification of the system's brain or thought process, often vocalizing thoughts to fronters or being an autopilot.

A brainmate may be a persecutor, protector, or fit into other roles.

Related Terms
Sentient System Functions are when a system/plural's functions have some form of sentience.