Korra in the world of the Black Lagoon and Revy in the world of avatar.
I think that these two girls have very much in common, although I do not think they will be able to cope with each other responsibilities. As planned Revy bend all elements, but most of all she prefer fire. Because it is a powerful and destructive force just like Revy.
With regard to Korra... In this world in which she found herself, she can only rely on herself and her arms. I do not think that she can kill someone