This may come as a surprise, but I actually think Wakka's story was the most interesting. A blitzball man who lost his family to Sin after he *spoiler alert*
Spoiler:
joined the crusaders and died on shore
.

But Wakka became Yuna's guardian after the Blitzball tournament and he hated a large hatred for the Al-Bhed and was a full follower of Yevon's teachings, but as he continued on with Yuna, he sooned learned the truth and rather than turn his back on Yuna, he fought against Yevon and helped Yuna to achieve her goal, and he also didn't become a rock head at the end and became welcoming to the Al-Bhed.