Is day 2 of participation too soon to be proposing topics? If not, then I suggest we set match-ups between characters and explain who will win and why. It should be on par with Jerry's discussion about shrinking down to get inside his girlfriend's mouth to check for germs... "of course if there was something there it might be pretty scary; although I would have those torpedos." It's in that vein.
i.e. Rusty the Horse v. Rusty the Bum
Rusty the Horse has overall strength but is subject to weakness in the gastro-intestinal realm. Rusty the Bum may exploit this weakness as he has friends with access to potato salad and quite a bit of Tupperware to transport it to the horse. And so on.