Dar is the older sibling of Colwyn and is a dragon of the abyss. Here's his info, copy/pasted.

Dar is one of many angel dragons, but one of the few to actually be born in recent times, in fact he was born on the 3rd of December, 1802. As a child he was often a bit rough with other angel dragons and beings and sometimes had to be kept away from the others from getting into trouble. This led to him feeling a bit lonely. Not wanting to see their child fall into the Abyss, his parents gave birth to Colwyn. They got along well at first, but Dar was already falling and hooked on negative feelings, slowly becoming more and more aggressive and sad. His fur coat was even beginning to turn black from it. Eventually his addiction led him to run away. Colwyn went searching for him, but by the time he found him, Dar had turned completely into a dragon of the Abyss. Colwyn tried to approach, but Dar wasn't going to have any of his kindness and attacked him until Colwyn couldn't move anymore. Afterwards, he walked down into the Abyss without looking back. He now feeds off of negative energy and his powers that he's had from the beginning fit him very well, which is the breath and ability of darkness.

Dutch Angel Dragons generally live in Aether, which is a dimensional plane closely tied to Terra, the physical world. Ones like Dar live in the Abyss, but can still interact with Terra. This allows Dar to sometimes cross paths with Colwyn. Dar feels like he has to be his sibling's rival and whenever he meets him he goes out of his way to cause him trouble. Other times he's generally causing problems such as nightmares and other things, but one of the worst things Dar has done is caused the tragedy of the Titanic, while making small things happen to endanger it, the little things ended up dooming the ship and killing many people. To this day he continues to cause problems and rival against Colwyn. Dutch angel dragons tend to hoard things like any other dragon. Dar's hoard consists of bones of the things he's killed or found dead. On top of these habits, though, he tends to try to drag others down into the Abyss with him as well, including Colwyn, but he's not always successful. Like other dutch angel dragons, he has the ability to interact with Terra objects and people for brief periods of time, even possess them. He can also float and fly in the air. He cannot physically manifest in Terra, though, as he is not powerful enough.

Dar has a feral anatomy. His color is mainly black all over. His eyes are yellow with slitted pupils and black where the whites would normally be and the eyes appear to be glazed over as if he was dead. His fur and feathers are a bit scruffy and his horns and claws are gray. The only parts of him that aren't dark are his gray markings. His inner ears, fingers and toes, some of his feathers, a stripe on top of his snout, and a tuft of fur on top of his head are all gray. The tips of his ears, his underside, and the rest of his feathers are even darker than the main shade of his fur. His tail has feathers at the end of it and his wings are of course feathered. He has two rough looking horns on top of his head and he almost looks like he hasn't eaten in a while. When standing on all fours he is 8 feet tall and about 21 feet long. He has paws with black paw pads and has a habit of drooling and not keeping himself clean. His vocalizations mainly include standard dragon growling and roars as well as some dinosaur like noises. He also has a forked tongue and sharp, but damaged looking teeth. The fur from the top of his head to a bit after the base of his tail is a bit longer, giving him a mane.

Dar ©

Dutch Angel Dragons ©

I did my best to keep the anatomy correct, but I'm not the best artist. And as far as I know I followed all the guidelines for DADs.