Masker

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Masker is a headmate who helps their system or certain members who may have trouble masking to mask something with a singletsona by fronting or co-fronting / co-conscious. They know what to do, how to act, and an idea of how the situation is going to go.

Related Terms
Caesian, personality shifter, mirror, shell and posier may describe different types of masker.

While caesian and shell explicitly mask the existence of the system and present as singlet, the other roles may also describe masking neurodivergence and presenting as neurotypical, or any symptoms or behaviours the systems feels the need to hide.