I: Bikke. He might want to get a better group of pirates to help him out.
II: Gordon. He always seems underleveled to start.
III: Alus. Great, I'm stuck in a town now and involved in bar fights.
IV: Palom. What a little brat. He's really annoying.
V: Butz. Go ahead and attack a guy in his own home. Go ahead and poke a sage with a stick.
VI: Locke. This guy has an inflated sense of self-importance and wastes a lot of effort protecting women that don't need it.
VII: Cait Sith. He's a confusing character that you can't trust, nor get rid of.
VIII: Irvine. The women aren't there just for you, sir. In close second is Quistis, with the very annoying habit of finishing others' sentences because she "knows them that well."
IX: Amarant. If you want to be loner, fine. Stop hanging around the party and go alone.
X: Auron. What a bossy, know-it-all jerk that thinks he's king of the world. It doesn't help when some characters call him Sir, inflating his already huge ego.
XI: Maat. You're seriously going to make me do sidequests to increase my level cap?
XII: Vaan. He's an annoying kid that never has any idea what's going on. Yet, we're forced into playing as him in towns. Dishonorable mention goes to Fran, who mostly exists as Fanservice.
XIII: Snow. Oh my, Snow, will you just please shut up?
XIV: Komuxio. What useless quest are you going to have "Dancing One" or "Walking One" do next?
XV: Gladiolus. Chapter 10 sealed it up for him. Tough choice, as Cindy and Prompto are also options.