Out of those ones, Rinoa. She's extremely annoying and childish, constantly forces herself on Squall for no real reason, needs to be rescued every other mission, never learns her lesson and the one time she gets reprimanded for it we're supposed to feel sorry for her. Give me a break.

My actual most hated FF character would be Genesis, the ultimate Mary Sue.

Honestly speaking though I like at least half of the characters on that list.