Derek is a tall, muscular, and handsome man with black hair, blue-green eyes, and olive skin. He tends to wear simple, casual clothes such as boot-cut jeans, henley or v-neck shirts in neutral colors, a black leather jacket, and boots, and he typically has either facial stubble or a scruffy beard. He's also notable for having a black triskelion tattooed between his shoulder blades to remind him that all werewolves, whether Alphas, Betas, or Omegas, have the potential to rise to one rank or fall to another. In his full wolf form, Derek's fur is completely black, and his eyes are bright blue.
Personality and traits
Derek's personality has gone through more development throughout the seasons than most of the other characters in the series. When he was first introduced, he was a sullen and aggressive werewolf who was beaten down by grief and survivor's guilt following the Hale House Fire and the murder of his sister, Laura. He was prone to threats and anger, and had very little patience for the newly-turned Scott McCall and his teenager-y ways. He used violence and fear to train Scott in being able to survive being hunted by the Argents and the Alpha, and was vehemently against Scott's relationship with Allison Argent due to him projecting his own unresolved issues about his relationship with Kate Argent onto them.