I adore the concept of some sort of potion/ support specialization! It would give more option for play styles, and isn't really something seen in mmos. I could see there being a more shadowy/ dark, sneaky, powerful burst attack sort of style spec, than maybe a more agile ninja, and have more consistent damage, and having some sort of kunai throwing ability, and then a potion/poison master support/healer role. Being able to maybe cause targets debuffs aswell as throwing potions in areas of party members giving buffs or heals. I think its important to feel like you could change play styles overtime and not feel like you have to retire or reroll completely, specially if you've invested alot of time and have a love for your charater. (: