3. Prudence, "Rugrats"
Remember Prudence? I bet you don't. She only appeared on one episode, but she was such a terror that I've never forgotten her. She was a megalomaniacal bully who forced Tommy Pickles and all his baby friends to line up in the sand while she rocked perilously in a swing over their bodies. She's like the animated baby version of Kathy Bates in Misery. Eventually Prudence learned a lesson when the babies hurled a wad of gum in her hair, but I'll always cherish her dictatorial reign over the jungle gym.