I never answered my own thread.

I think Ramuh and Odin are two of my favorites from a narrative focus. I've always had a sof spot for Ramuh due to having a bit more of a role in this game. Odin though, has one of the coolest backstories in the game and I love the fact we get a glimpse of the War of the Magi with it. Extra points for getting some special dialogue if you bring Terra to do this quest.

Gameplay side of things. I love Terrato/Midgarzolom, Alexander, and Crusader. Though Palidor saved my ass a few times as well.