I was never so fond of Scar, as in the latter half he became far less menacing. I admit though, Hades' character is particularly charismatic and the "evil lawyer". Gaston never struck me for much beyond a bait and switch - Beast as the anti-hero was more interesting. Ursula I am not too familiar with, but I have heard she is a well received villain.

Some of Khan's behaviors just struck me as so true to type. The fine balance between cunning, dignified beast and slavering killer.