This is my first entry. I chose a male unicorn for the first demon pony.
I based him off of an angler fish and a saccopharyngiforme, both of which are deep sea fish. His body design is a mixture of the sea, the sea floor, and elements found in both fish mentioned previously. He has no mane, and the reason for this is simple: very few deep sea fish have the normal organs most fish do, and most of them are missing certain body parts (organs, bones, muscles, fins, etc.). Because of this, my demon pony is missing a body part as well: a mane. His demon is a pelican eel, which is a type of saccopharyngiforme. Some saccopharyngiformes have the ability to create light, and I added in certain light elements to the pony's overall design as well as the demon's. Like an angler fish, this pony has eyes without pupils. His demon is the same. This pony is connected to his demon through the charm on his horn. The charm is a tooth from a deep sea fish.