Soma Fluid

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Soma fluid refers to when a headmate can change the way their soma looks. It can depend on their mood, as well as the soma can change to look like anything or be limited based off the headmate and/or system.

Related Terms
Shapeshifters can similarly change their innerworld appearance, with interras being a specific type of shapeshifter with no "own/original" species.

A soma fluid headmate may have a basisoma that they most often appear as.