Sylus is a 28-year-old 6'2 ft / 190 cm tall muscular man. He has messy silver hair, bright red eyes, and sharp facial features. His right eye will sometimes glow red when he's using his Evol. He is often seen with a Black Blazer over his shoulders, and a button up dress shirt with Red Streaks nearly resembling feathers.
According to Spacepedia, Sylus is the leader of Onychinus and said to have built his empire on illegal Evol weapons and Protocore deals.