Comic Crossovers I'd like to see

Sounds like a pickup line at a comix con – “Hey, baby, how would your Swamp-Thing like to meet my Man-Thing?”

How about some crossovers between Marvel and good ol’ Harvey Comics?

Hot Stuff meets Mephisto

Wendy the Good Little Witch meets the Enchantress

Baby Huey meets Howard the Duck

Stumbo meets the Hulk

Little Lotta meets the Blob

Little Dot meets Bullseye

Richie Rich meets Wolverine. And Sabertooth. Right after they’ve both been put through a six-week Marxist revolutionary indoctrination course and been injected with a massive cocaine-methedrine-LSD-PCP speedball.

Usagi Yojimbo meets Groo.

(there’s been a few Groo references in UY, and Groo has appeared in the background a couple of times, but no actual meeting that I’ve seen.)

Johnny the Homicidal Maniac/Archie

For once and for all…Batman/Captain America. For this to work best, maybe it should be some kind of alternate universe story where we don’t have to worry about everything going “back to normal” by the end.

I believe they did, when DC and Marvel first issued Amalgam comics

Woo-hoo! Thanks, Mr. Blue Sky: I know what I’m getting for Xmas!

Tank Girl meets Spider Jerusalem. And perhaps (since clearly I’m not taking this seriously enough) Duke from Doonesbury.

Or (although I have difficulty thinking of her as a comic book character) Buffy meets Spawn.

You might want to check out Batman/Captain America by John Byrne, which starts in World War 2 and is completely contained within its own little universe (much like Byrne’s Generations series; in fact, they might be the same universe, although I’m not sure). It’s a pretty fun story, and a rare case of DC work by Byrne that doesn’t feature Darkseid and a bunch of Parademons for no reason.