Sophocles the Deceiver. His true abilities and aces were unknown. He was a rare demon who used his brains more than his muscles. There were many records of his battles, but he had showed off far too many different abilities. The large amount of uncertain information meant that there was no useful information at all.
It was obvious that Sophocles had been trying to intentionally hide concrete information about himself. He had always been hiding his true power.
Judging by his actions and personality, and how he used schemes far more than brute force, he seemed far more like a devil than a demon. When I interacted with him, I also became certain that he was someone overly cautious and extremely sly.