I expect a Gunblade using job that falls under the Physical Ranged Role, but has several abilities to run into melee similar to a RDM.

Beyond that, I'd enjoy a Green Mage who does 'dps' by instead providing damage boosting buffs or mitigation buffs constantly to other classes. Or possibly a Dancer type healer that heals in melee or uses TP.

I'm unsure of what I'd want for Tank, Blue Mage maybe? Uncertain.