One crossover ship for them I think would be neat. Buffy Summers. They could asskick and wisecrack their way through both 'verses.

Yes yes YES! I think the two of them just have so many interesting and compelling parallels. It's on my list of fic ideas, but I'm not sure I could ever do them justice. I might just stick to my soon-to-be-posted essay on those parallels for now.

And I'm totally shallow: I'd do them both.

Great answers once again. This was fun.