Forget the dragon and even draven. I've had a design like this in mind for awhile now, but could never get it down just right. I think I finally have it, atleast a base (and I'm still deciding on whether to add wings).

He's very regal; an upperclass, noble demon; and can be a bit of an ass if the wrong buttons are pushed: passive-aggression to outright hostility. He is not above physically lashing out either. He does have a bit of a feral side and can seem like a completely different creature if it shows. He has an affinity for small puzzle games, wine, and small creatures. (Possibly making him a widowed dad- giving him a sore point and a softer side)

Height: ~6' at the shoulder
Length: 35-40'
Weight: 1-1.5 tons
Age: 730