In my opinion, Eirika's the best female lead in the franchise
Eirika appeals to me because I like characters that hate violence, but also understands that there are situations when you can't run. She''s not as naive as other games say
In Sacred Stones, she always tried to talk things out if she could, but she has never run from a fight or backed down from a threat
Her naivety ends as early as the prologue
"Enough. Hold your tongue."
"I… We, the people of Renais, have long honored our allegiance with the Grado Empire. And you invaded without warning. You ravaged our land. You killed my father… Even then, I told myself I must not hate Grado or her people. If I gave in to my hate, the bond between our lands would be lost forever. I refused to hate. Instead, I lived for the day our nations would know peace again. But… If this is Grado's true face… If you could extinguish Renais without pity, without remorse… If this is the case, then there is no room in my heart for forgiveness."
Her scene later with Lyon was not naivety. It was desperation, and she made up for it by telling the Demon King to shut his mouth