I've seen a lot of people get tripped up on this because the first book, 'Fire Keeper', is technically a sequel. It's the second book in the 'Fire Keeper' series, but the first book is actually called 'The Last Namsara'.
Anyway, the protagonist of both books is Asha, a badass dragon-slayer who starts off as this really rigid, duty-bound warrior princess type. In 'The Last Namsara', she's the Iskari, a death-bringer tasked by her father to hunt dragons. She believes in the old stories that paint dragons as pure evil, and she's feared by her own people.
The arc across the two books is her realizing the stories she was raised on are lies, that the dragons aren't monsters, and that her power isn't a curse. She starts to embrace her connection to the old gods and dragons, becoming the 'Fire Keeper' from the title. She's fiery in every sense—stubborn, quick-tempered, but also fiercely protective of the people she loves. I think what makes her work is that her strength is so tied to her vulnerability; she has to unlearn everything to become who she's meant to be.
By the end of the second book, she's a completely different person, a leader who's mending the world her ancestors broke. It's a great journey from weapon to peacemaker.