Dainsleif is a tall man with light blond hair and sea blue eyes with distinct, star-shaped irises that are common among "pure-blood" Khaenri'ahns, such as Chlothar and presumably Pierro and Kaeya. He wears a mask-like eyepatch covering the right side of his face while still showing his right eye. Dainsleif wears a black jacket with blue details, a gray vest, and black pants along with black armored gloves and boots. He also wears a black cape with a starry, space-patterned interior.