From Pluralpedia, the collaborative plurality dictionary
therapist (n.)
Applies toheadmates

A therapist is a headmate who provides therapy and mental health care for other headmates. There are several ways they can do this, such as researching coping methods for the system, reminding the system of what was learned in therapy, or being someone that others can vent to and receive advice from.

Therapists can be considered a type of caretaker or protector.

It is important to mention that just because a headmate has the therapist role, it does not necessarily mean that they are a licensed therapist and are qualified to provide actual counselling.