..C'mon!! How can I not make "Mrowr!" sounds in pretty much every other scene she's in?!
For those not in the know about Teen Titans, she has powers like Mr.Fantastic or Plasticman. I think she also showed up in Batman Beyond, but was almost always just a vaguely humaniform black mass of ick (not unlike a Spawn of Tsathoggua) in that future. And in both shows, I'd nickname her "Le Blotch" (which I think is from an Inspector Clouseau bit in the Pink Panther cartoons?)