Blue Mage as a caster-tank. I would extend the blue magic effects to not only make it as to be able to cast iconic monster spells but also include the ability to transform into specific monsters for extra mitigation or damage.
We coupd have a transformation job like druids in WoW.
Also transformation is a staple of the series with Vincent's limit breaks, Terra's trance or the Morpho class in FFTA.
