Substitute

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A substitute is a headmate whose role is to act in place of another headmate(s). This can be temporarily copying the subject’s, acting in place for them, and/or pretending to be them.

Related Terms
A substitute may also act as a masker or posier. Internally, they may present as a mimic or soma stealer or as themselves.

A substitute-space is similar to a substitute, as it refers to a sentient headspace whose role is to act in place of another headspace(s), meaning that they temporarily/permanently copy or act in place for them.