Is avatar Korra bisexual? They were closer than they should have been and in the final scenes, it wasn't clear if they were just close friends or romantic interests. 

A little google search and this is what happens:



There are sources that said the creators confirmed it, but I couldn't find these sources.
Yes, that's correct.

According to Michael Dante Dimartino's Tumblr (who's one of the main creators of the series), it was confirmed that Korra + Asami is a thing.


  Our intention with the last scene was to make it as clear as possible that yes, Korra and Asami have romantic feelings for each other. The moment where they enter the spirit portal symbolizes their evolution from being friends to being a couple.