From my and my husband's Return AU. Dragon Doc's last face and Dinky's father. He's been forgotten by all in the universe, including himself.
He is a Time Pony, of the planet Gallopfrey. His horn doesn't actually work. When a Time Pony regenerates, their environment has a huge effect on what they might look like, as well as other factors such as who they're with, what they're feeling, and even events that might be going on around them at the time of regeneration. They will always retain their cutie mark (known as a 'time mark' on Gallopfrey, as it's usually some sort of time piece or something related to time) they earned no matter what their appearance looks like. They always have an equine shape, but may take on other attributes such as horns, wings, etc. These parts will never function as well as those of the species they normally belong to, or they might not work at all, such as a magical horn being inert.