
Started with some possible sketches of his Black, Maryam (I like mounts having names that start with 'M' for some reason...), then I tried to draw him running without a reference. Pretty fail, but I think I captured his happy go lucky and his crazy wild hair. First portrait of a dragon in flight without reference...not too bad.
Xiren was a Dragonrider with no mother (died) and an extremely difficult father. He was a Dragonlord, and therefore had extremely high expectations of his happy-go-lucky son, who was kept isolated to cut off his cheerful streak and make him into a serious man. When he got his Black (a traditionally unlucky color) from a hatching, his father was disappointed in both his mount and his ecstatic attitude about getting her.
He grew up in the mountains then and made lots of friends, where his father couldn't limit his growth, but he was always close by, harassing him, physically abusing him, etc. Having no other parental figure to turn to, and the only model of adulthood being one of violence, his mind began to break and he began to have violent thoughts. These in turn twisted the mind of his dragon, and they spiralled downward together until, one stormy day after a particularly brutal display of abuse from his father and the assurances that he would both never make Dragonlord and was to be immediately transferred to the far reaches of the world, away from those he loved...
He killed his father and his aides. All of them, innocent or no. And he felt nothing.
He flew away on Maryam and went further crazy with guilt and the fact that he sometimes felt nothing but numbness. He started thirsting for power, resenting the other riders for branding him as a murderer so unjustly. He killed anyone who tried to take him, he took what he wanted. He had a bastard son by an elf, who she kept and named Karimo. He one day grew up and put an end to the killings of the father: the first and last time he met him, they were both on their Black mounts, weapons in hand, and Karimo left with blood on his hands and a sense of ease in his conscience.
And all this, from the smiling, happy youth who just wanted to play with his dragon.