Kahvi is most intriguing... there are many sides to her. Seems she needs to blow off some steam sometimes before her brain starts functioning, whether it's by fighting or surviving or dancing or "dancing."
An interesting blend of uncomplicated and mysterious, and maybe that's what had attracted Rayek to her (in addition to her being the strongest and most "special" of the Go-Backs).
Stubborn fool, drunken teenager, war chief, hero, rogue... and she does come up with surprising insights and observations, skewed as they may be by her philosophy. She's certainly not stupid, just sort of refusing to leave the safety of her rather straightforward ways.
Also, there's something cool about loud-mouthed girls. Heh.