Cassmate

undefined: A cassmate is a headmate primarily characterised by their lack of emotion or general apathy; they may have a role similar to a protector, in that they take front to shield the system from harm.

This term is not meant to discredit someone's emotional state or dehumanize them. As with all terms, it is absolutely essential that this term is only used with consent of the member.

Related Terms
Cassmates are commonly also apathy holders, dissonauts, and/or dissociation holders.