Validator

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A validator is a headmate that will validate another headmate whenever they feel upset about their place in the system, the system itself, or if the system collectively feels fake in some form.

A good example for how a validator would fill this role would be to help if the system or a headmate gets fakeclaimed. If the system or headmate gets fakeclaimed the validator could front, or internally communicate, to reassure the system that they're very much real and aren't fake / cringe / etc.

Related Terms
This headmate could also be a protector, soother, comforter, or a symptom holder for imposter syndrome.