Well, you're always the first to bring up lisencing issues, so I won't expect a crossover.
SWA-A-A-ARM. SWA-A-A-ARM! SWA-A-A-A-A-A-A-A-A-A-ARM!
I can deffinatly see Kraven turning evil in the story.
Hob Goblin and/or Demo Goblin
Cletus Casidy, but not as Carnage.
Much as I'd love to see Jackal, I think it's just a little to early for him
SWA-A-A-A-A-A-A-RM! SWA-A-A-A-A-RM! SWA-A-A-A-A-A-A-ARM!