(Possibly) I am thinking the new healer could be Potion Master or Alchemist. You guess it right, they heal by throwing tubes of healing substance to the ground for AoE heals (HoT/big AoE) or injection for single target. Weapon could be darts or crossbow type - and share gears with pysical ranger. They are very utility heavy, they can buff party-wide with smokes for the following enhancement for a short period of time:
1. Reduce elemental damage taken
2. Increase evasion to avoid physical attacks
3. Increase physical attack power
4. Add element damage onto target’s attack
5. Increase magical potency power
6. Temporarily float target to avoid floor aoe damage
7. Increase haste party wide
8. Grants immunity to the next all physical and magical attacks
9. Reduce enmity but tank paty wide
10. Grants immunity to knock-back mechanic
11. Increase physical and magical defense for 30s
12. Reflect most magic used against target back to the attacker
13. Runic that allow target to absorb damage as MP
14. Regen
15. Shell - reduce the chance target being inflicted by status ailments
16. Temporarily reduces MP cost to 0
17. Increases resistance to interruption or staggering