Choose characters, organizations, or objects (i.e. mecha, weapons) from anime and pit them against each other! What anime crossover fight would YOU want to see?
Personally:
Akatsuki (Naruto) vs. Espada (Bleach)
Yuuji and Shana (Shakugan no Shana) vs. Louise and Saito (Zero no Tsukaima)
Spoiler for Shakugan no Shana vs. Zero no Tsukaima:
^ Shana
^ Yuuji
^ Louise
^ Saito