So many shows get varying relationships between girls wrong because some writers think getting along 24/7 equals chemistry-

when actual chemistry entails different & opposing elements mix to make a solution or compound or reaction.

Toph & Katara work because they're both flawed, had ego's for different reasons and grinded each other's gears constantly. Toph wasn't some overbearing abuser or Katara this halo ridden angel that was always right. Things they likely would be if re-written in today's zeitgeist

Instead they're written as believable real people despite being fiction, and that conflict only made it clear to each of them (& us) where each other's boundaries were overtime & how to respect them. Not handled one-off in one episode and then they never disagreed ever again but multiple times even tracing into Book 3.

 Same applies to the whole team honestly, the show's dynamics as a whole work mechanically because of the care put into the conflict ( which is why the pairings work so well); Point being, many politically correct/modern safe mode writings that aren't political *ex. My Hero* scripts tend to have women all being friends immediately or something and it's so boring, It doesn't work because even for fiction, that's too fake.