Eh, I really dug Katara in Book 3. I really like "wingman" female accomplices, especially if the game is more of a corruption/bending girls to your will flavor.In all seriousness I'm not a big fan of modern FET katara's design. Also her character, not sure why. It's like she's lost all of the actual katara's characteristics and traits, and her artstyle is replicating that Korra's looking good though
It's kinda fun to have a partner character to discuss schemes with, share in the deviancy, and because they're also a girl it's also a bit like they're a traitor. They're selling out trusted friends to be mind controlled etc.
Pema is sort of like that, but what makes her also work in Book 4 is that Katara was "trained", but Pema is just naturally like that. She doesn't seem as dark as Katara was in Book 3, but still a nice touch.