While Bjorn mostly looks human, his Other is obvious in the particular blue tint that his hair is. It's a very light, powdery blue, but more saturated. His eyes are also a very bright blue, and if one pays attention when he talks, they may just note the fangs poking out from his upper lip. He used to have wings, but they often got in the way, so the Republic cut them off.
... we don't talk about his wings anymore.
Like many, Bjorn and his twin brother Soren's family was fairly standard. Their mother stayed home, and their father was often working. In time, though, it became very clear Bjorn wouldn't be able to live his life the way other children could. From a very young age, he had motor problems, speech issues, and other complexities that the small family couldn't handle very well.
It was probably a matter of time before their father left, and though their mother tried, eventually she had no choice but to give Bjorn to the United Republic, in hope they could do more for him than she could.
Bjorn was, as many are, spliced with Other genes, and while he suddenly could do a lot of things he couldn't do as a human, he also became more withdrawn over time. He was never outright vicious, and didn't have an inclination for disobedience like some, but he was very nervous, and had troubles controlling his abilities. Most often, when startled, Bjorn would generate a strange purplish shield that, when touched, caused poisoning. He wasn't often offensive, even when very stressed out, so the Republic gave him likely more chances to straighten out and fly right than they would've anyone else.
Still, he slipped up too many times, poisoned too many of the wrong people, and despite his danger rating being excruciatingly low, they still chose to terminate him. That is, until one of the older Gammas suggested letting his brother, whom had joined the Republic and signed onto the SOF at some point, try; and one of the Alpha Primes agreed with him.
If it wasn't for Jadyka Maitra's interference, and Suyis Lucain's support, Bjorn would be dead now, and he knows that, probably a lot better than most think.
He and Soren are now probably the handler and part-blood pair that are most infamous. They work very well together, and Bjorn hasn't had any problems since his twin was around more. Soren may not've ever forgiven their mother for the choice she made, but Bjorn forgave her a long time ago. They're also now the most common argument Jadyka and Suyis use when trying to force the Republic to bend on the no-family-contact clause. Some Losrians and part-bloods might be more cooperative and do better if they were allowed to remain in contact with their family, they argue, and Bjorn has to admit, they're probably right.
These days, Bjorn is very low-rated still, and he and Soren do little missions here and there. When Jadyka or Suyis say jump, they do, though. Fortunately, this isn't very often.