Necromancer sound more like a DPS than a healer...

But it can be seen as a SCH...
Creating sort of ward on people that will absorb/reflect damage
and sort of heal with life sharing... Absorbing life of ennemies or allies to give it back to himself or allies.
Same for mana (mana channeling, transfert some from NIN/DRG/MNK to healers or tank)

I don't like the system about dead bodies becoming sort of pets...

...

Every battle have casualties... but the most perfect fight have no death (except the ennemies)