I have 3 class ideas, of varying levels of fuzziness.
Assassin (name absolutely pending) - attack from stealth, apply various debuffs. Quick action to hide. Thinking about adding maybe a combo type system (like Diablo 2/WoW assassins/rogues. Alternatively, have upgrades that can make unstealthed attacks more potent? Still brainstorming.
Alchemist- Makes concoction, throws like bombs. Ally buffs and enemy debuffs. Maybe too similar to the Doctor class?
Hunter (my Bloodborne class haha) - uses monster blood to enhance attacks but at a dangerous cost. General idea: push your luck mechanic, focus on being a melee beast (as opposed to the arcanist which swims in similar waters???)