I really liked under_score's character in Venice. An elderly banshee who was a really effective murderer, but got extremely high from murder, which made her go out of control.
Deceptio's character was really cool too, and I do love Fox's SU too, even though he never got to post. Deceptio played a three thousand year old demon locked in a puppet, who was able to start to overcome his murderous nature. He tried so hard to be good, but a demon's a demon.
Fox was going to play a boogeyman, who scared children, but his powers only worked if you were afraid. If you overcame your fear, his power would weaken. I would have loved to have seen him in action.