The demon Sweet from "Once More, With Feeling" really is one of the characters of all time. He's one of the only villains in the series to just fully beat the good guys. He exudes a miasma that causes the people around him to uncontrollably burst into musical numbers so hard some of them explode. He can tap dance. He gets the episode's title drop. His story is resolved when he goes, "Well, it looks like I've made all of your lives worse in a small but significant way, my work here is done," and then leaves.



















