Bolin X Reader
Possibly a multi-part story! I'm kind of a slow writer, though!
Reader (you) is a firebender, part of a pro-bending team called the Polar Dogs! Your teammates are two characters of mine, Rena (the earthbender. Pronounced Reh-nuh) and Aki (the waterbender. Pronounced Ah-key)
You live alone. You used to live with your mother and father, but your mom died, and your father disowned you once he became part of the Equalist movement. You discovered your bending late, and he tried training you to be a chi blocker, and you did retain it, but once you found out you were a bender, he kicked you out.
You took up pro-bending as a way to earn money, but you found you had a talent in it. So, you've been a pro-bender for about 5 months now, and your team has only lost a match once.