Any ideas for unqie mechanics? Thats what I am most looking for, with the rest I agree.
Barbarian : already has rage which is unique and central to the class.
Bard : see
@Steampunkette 's recent redesign.
Cleric : reduce spell power overall, increase the uses and power of channeling. I mostly forget channeling in bg3 because spells are more powerful. Get a new use of channeling when you role-play your god's tenet at a significant moment, but lose one if you violate your god's taboo.
Druid : wild shape is already unique and central but the extensive and powerful spells are too much on top.
Fighter - should be the only class able to use weapon mastery. The mastery system could unlock combos with bonus effects like some monsters (e.g. hitting twice in the same round unlocks bonus "rend" damage, trip then stun in the same round unlocks a chance of KO). They should also be able to purchase several combat feats and have access to some unique high-level feats.
Monk: already pretty unique
Paladin: could be the "aura" class. Simply having one around affects everyone with an ongoing effect: hope, despair, fear, revelation (no invis or stealth), etc. As you level up the aura increases radius and/or acquires secondary effects. Smite is ok, but it never needed to become a collection of spells.
Ranger: the stalker class that rewards exploration and prep. Gets bonuses to hit, damage, track, and understand an opponent after studying it or interacting with it prior to combat. Limited to +1/2 levels but stacks over time for any individual creature. Ex. Track an owlbear (+1), then hide and observe it for 10 min (+1) then explore its lair while it's gone (+1). When combat finally starts you're at +3 to hit and damage. Entirely skill-based, cannot be dispelled or disrupted. Also has abilities to help the whole party hide or set up ambushes.
Rogue: already pretty unique especially with sneak attack riders.
Sorcerer: too much like wizard. It could be the only class able to improvise spells. (E.g. a noun-verb system)
Warlock: already pretty unique.
Wizard: too much like sorcerer. It could be the only class able to maintain multiple concentration spells.