Off the top of my head the first thing i think of is the move Wish from final fantasy tactics, where it takes hp from yourself to heal your allys, aside from that though a necromancer or witch docter would definately fit an edgelord healer theme. All i can think of is them using a giant docters needle as a weapon haha If they really wanted to get wierd with it though and fuse the poison and fairy themes together they could do a giant mushroom theme XD
the crazy thing about that is white mage is one of those jobs that have been in the whole series so there are alot of diffrent styles they could use for its armour specifically. also wierd question, did holys animation ever look diffrent? i have this wierd feeling it didnt use to be a giant light ball explosion, but it might just be me