This just gives a general idea of how Pyroglorp is supposed to look. This is not finalized, and may be subject to change.

Pyroglorp is a firey and oozing demon made of fireslime. Fireslime is an intensely warm sticky substance infused with fire magic that feels and acts like lava but won't instantly burn you. Pyroglorp is mostly a blob, though his head resembles that of a demon. Three things betray Pyroglorp's other form, the freezing angel wings and arms made of cryogoo and the cryogoo eyes. Cryogoo is a bitter cold sticky substance infused with ice magic that will eventually freeze those who stay in it too long.

Pyroglorp and Cryoglorp are one entity and can shift between the two forms at will.

https://www.furaffinity.net/view/39117301/ - Cryoglorp, the other form of the Thermal Ooze Duality