Thief would be cool. Not only you can steal and reduce HP at the same time (mug ability), you can call in devastating artillery support by throwing an entire treasure chest at the enemy (Thievery), which does more damage the more you steal.
Probably black mage. Casting flare, and randomly making people sleep is badass.
Probably a Black Mage. I like fire... a lot.
Because being a thief is cool, and because I wanna be popular with all the ladies in Lindblum
Magic knight~! Which I guess would have to be a knight with a black mage buddy in FFIX...