Who do you have in your party most of the time?

I usually have Auron, Tidus, or Rikku.
Auron because of his major damage infliction to every monster he encounters, Tidus because he has powerful techniques and I always like to have the main main character in my group. Rikku because I can get awesome items when I steal whenever she is really really leveled up. Also good at fighting.

I really like to use Auron and Tidus.Then, I usually switch out Rikku and Yuna. Auron because he does heavy damage, Tidus, because he is very agile, Rikku because of her Overdrive and Yuna because of the Aeons.

That is subjective.Putting someone in charge most of the time will render others in the party (which are unused) behind,and thus render them a bit ineffective the whole time - until the end,or unless you are a solemn grinder - then all are viable,especially those with Quick Hit.Besides that general note,mostly rotating this one : Auron/Wakka or both of them against high-HP and high-def bosses,except that I use Dark Mag Spheres to use Yuna as a black mage for her better Magic stat early on instead of Lulu.Besides that,Kimahri and/or Tidus.Rikku is not of a use to me :( Hope that helps.

Same as my forerunner...I use all of them to level them up. When I could choose beside his functional points, I like fighting with Auron (because his strong and my favorite character), Kimahri (he steals before Rikku joins the group) and Yuna because of her Aeons.

Well mostly Tidus, Auron and wakka. they cover most grounds on there own. Train them right and you have a great team. But Rikku is really close!

Well of course it depends on the battle, and usually in boss battles (particularly Seymour's battles) I end up switching out a couple times. But primarily, Lulu and Auron will always stay in my party. Auron is just beast at everything (and I love to look at him ♥) and Lulu's magic is super useful. Usually Yuna is in the 3rd spot healing, or if I'm lazy, spamming summons.