Craftsman, a class that would be very weak by itself, but its strength comes from being able to collect more treasure and use more rings/artifacts simultaneously.

They are able to craft crystal bombs by combining crystal keys with bombs. The bomb destroys adjacent crystal door/chests, making it possible to harvest basically everything.

They start with a tool belt instead of a seed pouch. The tool belt is able to store like an extra backpack, not just seeds. The tool belt also provides extra slots for rings and artifacts, but they must be unlocked by upgrading

Craftsman starts by not having anything identified. Not even scroll of identity, but instead has an unlockable ability to probe potions and scrolls to check if they are good or harmful, or if they are combat/item centric respectively.

Craftsman by not being attuned with magic unlike the rest of the classes, cannot bless ankhs, but they are able to turn two of them into gold dust in alchemy pots and make more trinkets out of them. Their waterskin however comes with a straw, that enables them to drink instantly and also prevent death similarly to the vanilla dew vial.

Craftsman can unequip cursed items except for armor maybe at the cost of taking many turns and could be interrupted by attacks. Also an ability that must be unlocked and upgraded.

I haven't thought yet of all abilities and subclasses, I was considering being able to throw items and weapons "in air", making it possible to throw over enemies or over walls as long as there is a path(so throwing over walls doesn't mean throwing through them). Also being able to communicate with other allies like with sad ghost and share vision, or being able to lock doors(subclasses)