This is Jae Roberts, one of the main characters in the book I'm writing, Iris.
Jae is the hero's therapist, and literally his only friend. He hides his emotions and does things he doesn't even agree with just to fit in with social norms (that's also why he's anorexic but...). He really, honestly, tries to stay neutral, but 7 times out of 10 he'll fail and end up calling the person he's disagreeing with a fool or something similar - especially if that person is our hero.
Jae's personality is based around Freud's concept of Superego, with the other protagonists taking Ego and Id, respectively. He's not much of a fighter, but when he has to fight he uses 6 over-sized needles, three in each hand. His associated animal is the house-cat and his color is yellow.