Like a few of you have mentioned, first I thought it was another damsel in distress like Rinoa/Dagger, but in a yukata.
But then she opened her mouth and started talking. That's when it all went to hell.
Am I the only one extremely bothered by her voice acting? She sounds like she has down syndrome and a respiratory problem. But it was cool how she drove the plot. It was HER pilgrimage, HER sacrifice, etc.
As a character... Useless in battle, Aeons play like a second-rate pokemon match. I'd rather heal from Rikku's stolen items.
