I've never played FFX-2, and i wanna know some stuff about the cast?

OKAY this goes for everybody!!!

-WHO'S THE IMPORTANT CHARACTERS? (i need more than yuna, rikku, and paine)

-What weapons do they use?

-Who's the villians this time?

-What's a dress sphere?

PLEASE ANSWER THESE, or try to answer one of them, I REALLY NEED TO KNOW!!