What are you using now? I am still scrubbing it with cryomancer, have to say though played some games with Kung Lao, Jin, Liu, and scorpion, and Kitana mileena a tiny bit.
Kung Lao is kind of disgusting, Jin has combo for days! Not much defense though. Scorpion holy crap, peeling off crazy combos in ninjitsu and hellfire is so easy. Wow, I mean, they miss one block its guarantee combo city for easy 35% more or less.
Still sticking with sub, he is the man. Really want to try GM and UB more. Just can't let go of cold blood at the end of any combo string.