Variants of MUDs in the Dissociation Related category
A MUE involving heavy depersonalization and delusional behavior, which causes the delusion of being a 'side character', 'NPC' or otherwise background character in your own life due to someone else being who you actually are. People with SSD/DE can feel like they're just a husk of themself, or a 1-Dimensional version because their real identity, life, memories, and everything else is in their 'true' self.
Not all symptoms have to be experienced to identify with this, the depersonalization and delusions are the only required symptoms
Symptoms
Coiner@russian-piece-of-shit on tumblr