What do all these characters have in common?
It seems like the Korra fanbase likes to place suspicion on every character that shows up, even regardless of actual screen time. Guess what: Bumi (and Aang!) was not Amon, Asami was not an Equalist, and Suyin was not a member of the Red Lotus! While I’m not saying Kuvira isn’t a villain, it’s far too early to begin speculating.
Not to mention, she saved Tonraq’s life. Call me crazy, but I don’t see anything malicious at all there.