Old thread, but interesting question nonetheless. I've probably go with L from Death Note, or maybe Lelouch from Code Geass. Any "protagonist" from the animes I've watched xD (protagonist in quotes because Lelouch is iffy, but his motives are good ) Actually, add antagonists to that list too. I would love to have a sparring mach vs. Father from FMA, "God" vs. The Lucid Dreamer, would be interesting.