Mix can work perfectly fine without consumables, and so can using items, without consumables. Instead of spell casting, the chemist crafts the item in a fight (not actually crafted but just a cast bar or maybe something more interactive) and voila. Can be a great healer. And samurai tank please. They're all about honor and that means defending your allies plus heavy(ish) armor. So tanking just makes sense. They will have decent defense, high evasion (NOT EVASION TANKS) that can dodge magic as well, and above all a high parry rate that can be manipulated and procs when dodging/parrying.

I know samurai sounds OP with that description but it truly won't be. It can be a stance much that increases evasion and magic evasion (only class with magic evasion as well as parries) but lowers damage or whatnot.