I voted Nu Mou, for the following reasons:

1. Originality: Nobody else has voted for them.
2. Aesthetics: They're frumpy little rabbit dolls. Yay!
3. Classes: Sage, Alchemist, and Morpher are 3 of the best jobs in the game.
4. Power: Flare, Lv. 5 Doom, Giga Flare, Raise, Toad...
5. Versatility: Since every Nu Mou class is magic based, they make the most potent "dual-purpose" character.

But yeah... mostly #1.