Alot of good ideas here.

I think it would make a good pure healer.
Possible weapons: potions bottle or a maybe a briefcase.
How it works: different potions give different effects. Heal (green bottle), damage (red bottle) buff (yellow bottle) raise (green bottle or maybe incorporate a phoenix down type thing).

Of course they would need visual effects to spruce them up. Need all the colors and boom! So how about after you use the skills it pulls out the bottle then:
heal: just throws it? Idk what more is needed beside a cool effect/animation
Damage: splash aoe effect
Buff:maybe like dancers where you press a few buttons.
Raise: a syringe