The Fragile - Bones so old a single hit knocks out the spirit holding them together . . . temporarily. They slowly reassemble.
Chor - The chor seeks only to re-cloak its frame. The chosen victim first loses flesh, becoming motionless, then blood, losing consciousness, then skin, leaving naught but bones. There is a chance, if the newly fleshed chor is turned, that the lingering soul of the victim can inhabit the new body.
Plures - The skeletons of children, hold hands, wrap arms, weave themselves tightly as a wall of bone surrounding their victims. Some say they will even cross chasms and climb inclines in pursuit, by weaving their mass of bones together.
The Boneless - A limp mass of flesh and hair that looks like a de-boned human. The first human to touch it will feel their bones called to it as their skeleton starts to rip out of their flesh. Serious wounds result.
Okay the last one is kind of a stretch-- it's the victims skeleton that's involved-- but, hey, close enough. I left off stats. I'd give saves versus the real bad stuff (2,5) do a certain die of damage per round for the others or just treat as normal skeletons otherwise.