According to Bjorn's SimDNA in SimPE he had blond hair before it turned grey. Similar to General Chip Grunt, his eye and hair genetics are inconsistent with that of his parents' genetics. Bjorn's name proves that his family has Scandinavian ancestry, as his name translates to bear. He and his family might have Swedish roots.
Though Bjorn's thumbnail displays brown eyes his genetics are for light blue eyes. The reason for this is because he has a corrupted face. According to his age data in SimPE, he had 20 days left in the elder stage when he died.
Bjorn returns in The Sims 3 as an adult, living with his family in Aurora Skies. He has 5 points in Gardening and 3 in Handiness and works as an Aquatic Ecosystem Tweaker. When first played, in Aurora Skies, he is 11 days away from becoming an elder.
This Sim has no character data and cannot be resurrected in-game. For more information, read this guide.
This Sim has a corrupted face, and will likely appear with a randomly generated face when initialized in the game. This Sim's corrupted appearance may be genetic and may be passed on to their offspring.