Yeah she has conviction. But any time she's doing stuff that feels like it's driven by herself it's to resist change, not to initiate it. Which does matter. You claim that sticking to your beliefs in the face of adversity is a difficult thing... I actually think it's oftentimes the easier way out, personally. Making changes in yourself can be difficult, even if said changes are things that would make your life easier. That's why archaic worthless traditions like Yuna's pilgrimage are so enduring.
To elaborate on what I meant by comparing her to Wakka... I feel his development in the game was shaped more by absorbing events, and coming to conclusions on his own based on seeing what's happening, simply because of what was the catalyst for it. Yuna I feel her development in the game was shaped more by being influenced by people around her, and coming to conclusions with their thoughts in mind. There are no specific events that make things "click" for her. Like at Zanarkand I felt like it was more like... she was thinking it was wrong for a while now due to grievances from Tidus and such and just got the nerve to come out with it when Yunalesca decides to be a jerk about it all.
But I mean, I'm not saying she's putty or something. I think you may be over exaggerating what I'm saying in your mind due to me presenting it as a flaw in my eyes (because it's not, necessarily, depending on your perspective). Obviously she has convictions and can make decisions for herself. I'm just saying that she's not someone who actively spurs on change in herself for the better (or the worse, as in FFX-2)-- she has to look to other people to draw the strength to do these things. Not necessarily a bad thing-- you could actually paint it favorably and say it's a sign she has a lot of empathy (which she clearly does)-- but something that makes her less appealing to me. She can surely make decisions on her own, but I feel any significant change in her thought process or attitude or course of action involves drawing from others to make it, based on the events of the games.
Maybe that's just a flaw in the writing of the games, though, that every bit of significant change she has is first seen in another character's way of thinking, I don't know. I'm just saying you've got people like Wakka who have change that isn't clearly tied to an individual so it's clear that that kinda development does exist in the game, at least...
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No problem!
This is a cute and pop genocide of love!