Press B, wait about half a second, and do it again, keep doing that and you will have an unlimited combo. You can then finish the combo.

Second- State Sasuke's Combo is pretty much the same as normal Sasuke's. Press B twice, wait about half a second, do it again, and keep doing it over and over again. But it's a little harder to do it with him than the normal Sasuke.

Choose the normal Sasuke, and press B twice, wait half a second, and do it again, and keep doing that. If you do it corretly, you will end up with a somewhat unlimited combo. The highest combo that I have is 21 hits. Someone can still get out of it, so be carefull when doing it.

I haven't tried it against an actual player, but I did it against the game. I would reccomend that you would use a fast character like Sasuke or Lee to do this. When you are in a fight, and someone is about to hit you, as quick as you can, teleport behind them using the L button, and use a move like Pheonix Flower Jutsu. If done correctly, the other character should be in sort of a paused position, but moving, as if something messed up the game on only that character. Trust me, I don't try nor want to mess up people's game(s). So when they are paused, hit them as quick as you can. Use that to your advantage, and finish off the other player.