Here's some links for both of their abilities:
Wuya from Xiaolin Showdown (not Xiaolin Chronicles).
Aang is from the end of his series.
Wuyaa has access to all her power.
Aang can go into the Avatar state if he needs to but does not start out in it.
Aang has his staff.
No outside help.
Standard morals for both characters on.
Fight 1: Fight ends in knock out or death.
Fight 2: Fight ends in death.
Both fights take place in a place like this: