Tango is one of my lovely main oc's
despite human/demon appearance he is actually one of these lovely creatures http://sta.sh/026yb5j9geo4
they are called Silentium and are a species of dragon that are basically just hollow beings that are filled with a fire, allowing them to float, i could ramble on about them for hours but i dont think people would be interested xD

He has gray skin because his species is unable to recreate the wide variation of skin tones, so they stick at a basic white-black quq