Sister Figure

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A sister figure is a headmate whose role is to be a sister to another headmate or to someone ouside the system. This can encompass acting as a caretaker or protector to the other person, or being their sysling or syssibling in case of internal relationships.

Related Terms
A sister figure may be considered an allegorican or conceptive if their role as a sister is central to them.

Parental figure, sysparent, syssibling, and eresian similarly describe familial relationships between headmates.

History
The term was first introduced by the Post Apocalyptic Pack