I use Yu - as I mentioned some pages ago.
If you're looking for combos, I can't really give you much, outside of two really basic combos.
Basically, 2B > 5B > 5C > 214D is arguably the simplest combo to work with and probably the most damage basic one he's got for ground combos. Nice thing about it, is that it starts off with Yu's anti-air and can gatling into his 5C for air combos if you catch your opponent in the air with 2B.
Outside of that, the air combo I know of is Raging Lion B > 5B > 5C > j.C > j.C > Risky Gamble > 236236C. Easily puts out 3k with 50 meter. Problem is getting Raging Lion to connect. You'll have to pressure with 5D's low to mix up with Raging Lion B's overhead to get the combo in. Once you start learning how to pressure well with Yu, it'll be a bit easier to launch and fire off that air combo.
Beyond that, the first combo - the basic ground combo I mentioned - can be canceled into Cross Slash during Awakenings on the last hit of 214D. You can also cancel into Ziodyne (236236C) whenever you have 50 meter.
I recommend mixing up basic low-ball damage combos by finishing off with sweeps to pressure with 5D trying to get counter hits off Raging Lion A and B for damage. If you're stuck at a distance or someone wants to play projectiles, Yu's got a nasty 236C projectile that's fast and can be spammed. If you need to, you can EX it for paralysis on hit and power through other projectiles.
Beyond that, can't really give you much info. I haven't played online so I don't what the typical combo likes to mess with yet. Mostly just practicing till I feel comfortable performing the two combos I know of. I know there's a way to end off an air combo with Raging Lion A, but for some reason I can never get j.C to come out so I can get 214A to work.
