My favorite would be Cactaur due to fact that he deals damage depending on his level, And at level 100 he can decimate most enemies with 10,000 Needles. Plus he is the only one that comes with the luck junction and evade junction(besides Eden and Scrolls). Initiative is must and the having all the stat bonuses is awesome. I guess the only downside is you get him so late in the game, and the battle against him.

Tonberry is a close second because of his call shop and junk shop abilities, and his LV Up and LV Down abilities are fun to use. But getting him is way too much of a hassle, therefore Cactaur is my top choice.

FF That Most Deserves A Sequel - FFVIII

FF That Shouldn't Be Part Of Main Series - FFX-2

Best Port/Remake - FFIV(GBA)

Worst Port/Remake - FFV(PS)

Most Challenging FF Game - FFVIII

Least Challenging FF Game - FFIX

Best FF Side Quest Game (e.g Crystal Chronicles, Mystic Quest, Tactics) - FF Tactics

Worst FF Side Quest Game (e.g Crystal Chronicles, Mystic Quest, Tactics) - Crystal Chronicles

Best FF Game - FFVIII

Worst FF Game - FFX-2