Answer:
Katara's fierce determination doesn't simply go as far as wanting to protect her group or helping people in need. It also extends to her learning waterbending, as even without a teacher, she trains tirelessly to perfect the basics and shrugs off all of Sokka's criticism on the matter. She’s passionate, strong-willed, and brave. She’s a powerful waterbender that’s not to be messed with.
Or at least I’d never mess with her. he’s the only one that can calm Aang down and she knows how to bloodbend.