I'm gonna be a fanboy here and say Bolin. :D No one is convincing me otherwise even if they are right. :P
I don't like Mako's lack of loyalty to Asami. He obviously does not know how to treat a lady. He fails as a gentleman... but he wins this match because of the fact that he can shoot lighting out of his hands.
Damn it. Sometimes, I really hate the truth.
I don't even want to get into this.... but Mako is a teenager, and dumping your girlfriend for another girl is way less hurtful then what other people do.
Also that love triangle BS ruined the first season
The first season was suppose to introduce us the characters and give insight to their personality and background, and give us an understanding. Just like Avatar did
BUT NO we had to have the rushed Makorra shipping in the first 5 episodes WTF
Bolin is useless comic relief, Asami doesn't have a personality, Korra air bending was random, and Mako is too "Should i choose Korra or Asami.."