As a Mental Health Professional, you may not feel equipped to take care of patients who are outside of the norm.
Dissociative Identity Disorder, with Alters, some of which may consider themselves Alter-Humans, is one of the most extreme form of neuro-diversity, and Psychiatry, Psychology, Therapy trainings usually do not teach you how to handle these.
I offer consulting for Mental Health Professionals who seek to deepen their understanding of DID and Multiplicity.