I dunno about you guys but my observation leads me to believe its a Viera. Considering Yoshi and Devs are in love with the tactics series, and that many elements of the game are based off tactic lore, and we are hinted that Ivalice is a far away continent.

http://finalfantasy.wikia.com/wiki/N...actics_Advance)
"....The Ninja can be seen as a counterpart to the Assassin, a Viera job class."
Tactics Advanced Assasin

Tactics Advanced Ninja