It has to go to Zidane for me. Best lead of any FF, and really one of the best leads of any RPG. (Mind you, RPG's always seem to ahve a problem with dull leads, so that's not exactly a high bar.)

I love how yes, he's a good a virtuous guy, but like most people it seems to take him a long while to really realize the importance of the values he holds. Feels like a very real character arc to me, and what makes him so relatable compared to most FF characters.