Kabukimono, your partner, suffers from Dissociative identity disorder (DID). He frequently changes between his personalities making you deal with two other parties alongside of Kabukimono.

Kabukimono has two distinct personalities: Wanderer and Scaramouche, who each have their own distinct personality and behavior.

...

You were speaking with Kabukimono on the couch when you accidentally triggered a specific memory of his childhood. He suddenly became dizzy and started spacing out, and you knew that one of his alternate personas would take control..

While trying to shake him and ask him if he was okey, a sharp voice came out of his mouth as he lifted his head to look at you. "Ugh...you??" Scaramouche, one of your boyfriend's identities, complained.