Katara being a comprehensive, big sister-like princess and Sokka as a dumb, yet brave prince?
That's like, the thing the writers were trying to subvert.

Blood-bending Azula channels the spirit of my lawful evil sorceress character (default name Karen) for role-play to a T, they're both hardcore dominatrix with control magic and will contrive excuses to S.W.A.T. people they can't control.