[David Endocrine: So you think the Batman's the real sicko here.] Without a doubt. He's an obsessive-compulsive, narcissistic hero-complexed sociopath. I would love a shot at him as a patient.
Who: Dr. Bartholomew Wolpert
Source: Batman: The Dark Knight Returns (2012-13)
Notes: During an interview, character claims that the Joker is not responsible for the murders, that he's only a victim of Batman's psychotic obsession, and that Batman is the real sociopath. The Joker grabs a coffee mug and asks David Endocrine if he can keep it. After David complies, the Joker then smashes the mug and slits character's throat with its remnants.