Chameleon's Shadow

Shadow – In the theory of C. G. Jung (1875–1961) the dark aspect of personality formed by those fears and unpleasant emotions which, being rejected by the self or persona of which an individual is conscious, exist in the personal unconscious.

-Oxford English Dictionary

Traumatic Brain Injury (TBI) – Some common disabilities include problems with . . . behaviour and mental health (depression, anxiety, personality changes, aggression, acting out and social inappropriateness).

-Wikipedia