I just wanted to sort out my bodytypes since my headcanons differ from the norm. Sorry it's a sketch! Also wow, really boring poses.

Aradia: Tiny and short. I imagine her thicker after she godtiers.

Tavros: Big and beefy (lol). One of the tallest.
Sollux: Average build. He has the shiniest hair, and tiny wrists.

Karkat: Actually kinda tall. Good build, and a darker grey skin than the rest.

Nepeta: Strong and average height.

Kanaya: Tall and slender!