Zaheer is the best villain the Legend of Korra has ever put together.
He looks cool.
He goes too far but he also has a point.
He leads a team of total bad-asses. You can feel their shared history when they are on the screen together.
And he is voiced by:
Githyanki Diaspora 
I had no idea Rollins was Zaheer — bad ass.
This is the first post that really convinced me to give this series a second try. Not because of Rollins, whom I like, but because I enjoy strong antagonists.