Now, before I continue, just remember. This is my personal opinion. If you disagree, that's fine. Just show some respect for it, and I'll respect yours.

If you ask me, I think a crossover game/anime/manga/comic book between Rosario + Vampire and Street Fighter would be awesome. I could picture these rivalries easily:

Ryu Vs. Moka

Ken Vs. Tsukune

Dan Vs. Kurumu (Allure Vs. Super Taunt)

Q Vs. Mizore

Sagat Vs. Kokoa

Inner Moka Vs. Evil Ryu

What about you guys? What rivalries would you think would be good?