How silly of me to assume the creatures frequently refered to as "Deities" that are essentially the manifestation of prayers were gods. If they're actual gods or not, they are certainly considered as such by both the Ascians and the Beast tribes. And by their other worshipers in the case of Thordan and Shiva. Thancred even jokes that you, the player, are their own personal god-slayer.
Hell, its even hinted at by the Ascians that the player may be a form of Primal too, given strength by the worship of the people of Eorzea.
Do remember that he remarkably gained all of his combat abilities off screen. He went from being a strict none-combatant to skilled Arcanist in the time it takes for you to pass through the gates of judgement to the Foundation. By the time you get a couple of quests in, he's even advanced so far he can summon two entirely new Carbuncles he invented as he went along.
He also went from being Mystery Kid in the opening scene to de-facto of the Scions by basically just showing up out of the blue one day and inserting himself into the role while Minfilia was captured.
As for the Crystal Braves, I think you'll need to do better than him acknowledging that he's too much of an idealist as evidence that he's not a massively idealised character
.
They tried far too hard to make her endearing and overshot. It's like a Choccolate Cake thats topped with Ice Cream, then covered in Sprinkes and Raspberry Sauce and served on a bed of Summer Fruits, Toffee and Marshmallow. It's just
too much! Every time she did that eager little dance I just wanted to violently vomit out my own internal organs I despised her that much. They even had her playing the damsel in distress role once or twice too just to really cement how much I hated her.