1) Height: 5'6" but can stretch and alter body at will (no internal skeleton)
2) The black mass on the right is known as Soul and is an extradimensional being that essentially pilots the "Pelt" that is the Monster that is seen. Kind of like a person in a fursuit.
3) Soul cannot interact with the 3rd dimensional world normally, so it uses the Pelt to interact with and experience the world.
4) Agender/Greysexual/Panromantic
5) The quills on its neck and tail can fold down and stand on end, and grow back if broken off.
6) Bleeds a thick yellow/green goo
7) Expression is shown in "pupils" as on far right top
8) Can hover but not really fly
9) Tailmaw has it's own brain but can communicate with the main brain via an internal link
10) Fur is very sleek but can fluff up to nearly 3x

• sorry the front view looks dopey, i can't perspective with skulls