Edit: After feedback and consideration, I have decided to drop the idea of using TP, due to balancing, however I am trying to figure out a way where a hybrid healer may work
My thoughts for chemist would be a skills based healer that while still using MP, focuses on skills and cooldowns rather than MP management. Like WAR as a tank, Chemists would be able to deal more damage than other healers (constant damage, not another Holy), but would be hit by the dilemma of using up their MP by doing so. As alchemist exists I would not expect the job to be called Chemist.
Weapon: Grenade Launcher
Abilities (names not final):
Mix - The famous chemist move. To me this will be what makes chemist unique and will act similarly to Ninjas Mudras, for both offensive and defensive actions, the chemist will queue up different ingredients from their hot bar, and then initiate them into a move using mix. Mix would be an off cooldown skill with a very low recast (2.5)
Bomb: Bomb + Mix - The chemist creates a bomb and fires it at the target mob.
Bomb II: Bomb + Bomb + Mix - Equivilent to a Bomb II, an attacking move with higher potency
______: Bomb + Adrenaline - AOE attack
First Aid: Potion + Mix - Basic Heal
First Aid II: Potion + Potion + Mix - equivalent of cure II
________: Potion + Adrenaline + Mix - AOE Heal
________: Potion + Bomb + Mix - DoT attack
Recover: Adrenaline + Adrenaline + Mix - Revive
Inoculate: Adrenaline + Mix - Esuna
etc.
Drink - Increases potency of Mix for a short duration
Pharmacology - A gimmick move like Mug, applies a buff that increases the potency of food and potions (does not increase exp from food)
Quick: Makes either all ingredients until the next mix instant cast, or all ingredient for a certain time (reason for this is to counteract the fact that swiftcast would be useless)
Limit Break: Phoenix Pinion
Cross Class: Conjurer and Lancer (or perhaps Rogue)
Questline: As the job is an MP based chemist, this would make them more akin to a battle alchemist, and as such, tying in the characters from the alchemist guild might be a fun and interesting take on the lore of the job
I will update with more ideas