The key to succeeding at mk3 and umk3 or any fighting game in general is knowing character tiers. Your best bet in UMK3 would be learning the ins and outs of Human Smoke. Select robot smoke and hold down Back, high punch, block, high kick, run before the match and he'll turn into human smoke. Human Smoke's ability to juggle opponents in the air is one of his deadliest attributes. An opponent not expecting his quick hick kick, down high punch combo can be juggled into an 11-hit combo for major damage especially in corners. That brings us to another topic: cornering your opponent.