I only liked Auron and Rikku, really.
Tidus, Wakka, Kimahri and Yuna really annoyed me at times, even though Yuna's one of my strongest fighters. That leaves Lulu somewhere in cyberspace, completely ignored her. I hope she doesn't Firaga me.
Anyway, I'm going to incur the wrath of most of these forum posters because I dislike most of the characters. Not a problem, I'll just hide behind Auron.
Non-player characters...not many people I like there either. Apart from Maechen/Maechan (sp?), that guy is legendary.