Image imported from derpibooru 
Original Description:
 
Onyx Flare  
Nickname: Onyx,
 
Family: Rarity (mother) x Spike (father).
 
Age: 17
 
Appearance: Dragon-Pony hybrid.He has grean coat, purple mane and blue dragon-like eyes. He has spikes at his tail-root and at the end of his tail, big claws on all of his four hooves, scales on his flank and downwards on the back of his hind legs and large dragon-like wings. He’s much larger than other stallions and has a rather muscular structure.
 
Cutie Mark: Doesn’t have one
 
Ability: He has an ability to sniff out / find gems, good sight and hearing, incredible strength and (weak) fire breath. Due to his large wings and strong muscles in them he can come up to quite the speed when flying in a straight line but is terrible at turning and agile flying. His dragon blood have also made his body very resistant, he can withstand strong heat, cold and has tuff skin that can take some beating.
 
Personality: A loyal, kind and caring guy that looks out for his friends and rarely gets mad. He always seems to have a smile on his face and also seems to have that childish innocence. He’s more of a go-with-the flow/follower than a leader and is always up for his friend’s ideas without questioning unless it’s mean or INCERDIBLEY stupid. He is also quite clumsy since he seems to forget how large he is and don’t always have “an eye” on his body parts as well as forgetting how strong he is. His most childish side is his love for comic books.
 
Residence: Carousel Boutique / Ponyville
 
Bio: A child between a dragon and a pony was believed to be impossible so Raritys pregnancy first came as a shock before it became pure joy for them but it wasn’t without complications. Rarity got trouble walking, standing and even lying down due to Onyx being much larger and different from a normal foal. It was even starting to become a health issue for her but she decided to keep on fighting and made it in the end thanks to some help from her friends and even the dragon queen Amber. Once he was born he was at first enwrapped in a little shell that looked like an onyx (so Rarity did kind of give birth to an egg that hatched seconds after it came out) and as an infant his iris was black before it got color and that is how he got his name.  
As a child he was from time to time mocked for him being different but he never let it got to him and the lack of a cutie mark have never bothered him either. He sees it as a possibility to be whatever he wants and he likes to try out all kinds of different things until he’ll find exactly what it is that he wants to do.
 
Relationship: He has a great relationship with his parents. His mother was the one who taught him to be a gentlecolt and to be generous while his father taught him how to fly, breath fire, find gems and fan-girling over comic so they mean quite a lot to him. When necessary Onyx filly-sit his little cousin Pearl. They get along good and enjoy their little cousin-times, he doesn’t mind her painting his claw or putting sparkling stickers on his scales, he would much rather have it this way than her wanting to go on some crazy dangerous adventure.