I wonder what Kotomine would think of Max Stirner. Kotomine considers himself "evil" based on his... unique inclinations because that's what he believes (usually correctly) society would consider said inclinations. Stirner would consider such a consideration to be based on nothing but spooks. IIRC, there was a line from Kotomine saying that people know good and evil through learning (and thus Angra Mainyu cannot be "evil" because it know no other path), but Stirner wants people to learn that there is no significant defining factor of moral value other than their own selves. Anything else that appears to define moral value is just another spook.