owlmoose, have I got a present for you! Unless you've already found it, of course.
Final Fantasy X
Title: The Seeker Files
Author: Jebus Creiss @ Fanfiction.net
Characters: Dona/Barthello, Paine, Rikku, Beclem, Chiapa the Cactuar(!), Baralai, Nooj, Zuke, Tidus/Yuna
Word count: ~ 20,000
Summary: some time after the end of FFX-2, Barthello is once again in Dona's bad graces. As a Warrior Monk guarding Kilika Temple, he assists in a book burning at the direction of the New Yevon high priest. Except -- he saves a book, because he's trying to appease Dona. And she throws him out before he can tell her.
He doesn't know what to do. Then he realizes that Sir Auron is one of the book's co-authors [about the only weak plot point in all this...how?], sits down to read it, and... grows up.
Barthello is most definitely the hero of this story. It involves worldbuilding, messy Spiran politics, LOTS of minor NPCs being used well, main characters doing something meaningful after they "live happily ever after," and everyone sounding completely in character from Rikku to Tidus, Dona to Beclem to *stare* the Cactuar.
Happy Hogswach, KJ!