Auron is a much better character on a second playthrough, I find. I'll offer "Make mistakes. That's what youth is for, after all." as an underrated line of his.
An aspect of his backstory that is very rarely brought up but which I find interesting is mentioned by Braska: ...a warrior monk, doomed to obscurity for refusing the hand of the priest's daughter.
I've always wondered what the story around that might have been. Pity we'll never see a prequel.
Favourite FFX character: Yuna
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We are living our lives
Abound with so much information