Ooh, let me do it for each game. Favourite:
1: Fighter. They're just cans full of awesome
2: Guy, because he's Guy. Or Maria, because she doesn't wear pants.
3: The third onion kid. You have to wonder how he's related to the others.
4: Rydia. "Stop touching my butt!"
5: Bartz. No reason, really.
6: Edgar. He's a pimp.
7: Cid. I don't need to explain myself here.
8: Squall. I can empathize with him, really.
9: Vivi. If you say otherwise, you are wrong.
10: Rikku. Yeah, I had a crush on her
10-2: The off button on my PS2
11: Durpa doo.
12: Balthier is badass
13: Have yet to play this.
Least favourite:
1: Thief. They are entirely useless, unless you really want to use the Katana
2: Leonheart, because he does nothing all game.
3: The fourth onion kid, because he's a clone of the first
4: I would say Telah, but the spoony bard line trumps anything, so we're going to go with Rosa, the dumb bint.
5: Cara/Kara/Krile/whatever it is this week. Her grandfather is so much cooler.
6: Gogo. Lacking a back story really sucks.
7: Cait Sith. No explanation necessary.
8: Zell. He needs to shut the hell up. All the time.
9: Eiko. You are too young to have hormones, missy.
10: Kimarhi. Only character I've never really used.
10-2: Myself, for playing this game.
11: Cherry jam.
12: Everyone not named Balthier (and maybe Basch)
13: See above.