Which units in the Dungeon castle do you dislike the most (based on their appearance)?

Yesterday, I saw the "Soul Eater" spell in action for the first time. It was a disgusting sight. The hero even made chewing noises. Couldn't he consume the souls of slain enemy units instead of his own?

Also, I didn't like the appearance of the Devil and Archdevil. Their heads are too small; it's obvious they have no brains.