Delusauxi

undefined: A caretaker or internal self helper who completely or partially is and/or identifies as a system's delusion (whether they be an introject or just hold that specific delusion).

They act out or exhibit traits in line with that delusion (usually in an constructive or non-harmful way, but not always) to help the system cope and/or deal with the delusion. This is normally a voluntary role but it can be done involuntarily.