Unstable Personality

undefined: An unstable personality is when a headmate/alter has a personality where it “breaks” or “shatters” then suddenly becomes a completely different one which is more distorted and/or unstable each time. It can also be at the same level of unstableness or distortion each time it shatters and becomes different. Their personality may do this due to stressful events/trauma/etc. but not always.

This happens to their personality, not their whole person. This can also be due to a disorder.

Other Terms
A similar term relating to a whole system may be Vardian. A system with a lot of headmates with unstable personalities is a Unstable Personality Heavy system.