Sibling Figure

undefined:

A sibling figure is a headmate whose role is to be a sibling to another headmate or to someone outside 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 sibling figure may be considered an allegorican or conceptive if their role as a sibling 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