I thought of a Black Mage as well. While I did think of a soldier as they're often the leaders of the group, the party member black mages do often fulfill the backseat leader role, and there are quite a few cases of them becoming leaders themselves. The introverted, perfectionist, and calm qualities are all traits often assigned to mages, and with the exception of Vivi, they're all pretty confident... especially when taking into considering many of the non playable black mages, Palom, and Lulu.