[In the reference image, it shows elongated teeth, but he does not have them. His teeth are of usual length.]
When it comes to something he wants, he is very tenacious. He will not give up on something when he puts his mind to it. This helps him through his every day life, and gives him a sense of drive and purpose to see through to what he is doing, and trying to accomplish. There is a time when he can be seen as playful, and it is usually in the presence of a female, or multiple females. His charismatic ticks poke forward and he can do little to stop himself. He puts on thick layers of charm for the females, trying his best to impress them.
Hazel did have some troubles with pregnancy keeping and sticking all the way through. But finally, she gave birth to three young males: Obsidian, Coal, and Slate. It was determined from the first chance that Obsidian took his first breathe that he too would be set up for an arranged marriage, as he was the eldest. His father would find the future prospect and heard that the Winterfell family was actually looking for the same sort of deal. Albus and Hail spoke for a long time, trying to figure out if the pairing would work and their two houses could be aligned. Albus wanted Obsidian to join the Imperial Army first, serving his country to learn a sense of responsibility and duty.
So the two fathers would wait for the opportune time to try and set their children up. As Obsidian grew older, he was taught the average things a knight would be. He could hunt, fight, and even fish. He was studios and wanted to take every lesson to heart. His little brothers tried their best to beat him at literally anything possible, but he was always just naturally better. Obsidian was accepted into the Imperial Army nearing his second birthday. He was a large and formidable foe. He worked for many years, and still does. At the beginning of his fourth year of life, his mother gave birth to another litter, and her last: Opal, Onyx, and Ruby. Obsidian was proud to hear of the news, but he was so set in his path among the Imperial Army, that he did not come back home to see the little ones. He is too determined to stay with his duty and honor.