Re: 4th String Villians Yeah!
I love the White rabbit, and I'm happy to report that she's appeared many more times (if quite briefly) since her first run in Team Up. In fact, Comic Vine has her at 37 appearances.
My love for Stilt-Man is pretty well known to most, but I'd say he's a third stringer. Well, before he was killed, anyway. The fact that they made a big deal out of his funeral was pretty cool.