Oni is all of Aiden's negativity made manifest. He is all the self-hatred and general hatred. He insists that Aiden needs him to survive, that he gives him the strength through these negative emotions like anger, hatred, and rage. Oni also deeply hates any mention of any female persona or counterpart that Aiden may have, no matter what name, shape, or form they take and will not hesitate to "kill" them should they arise within his mind.