Luka has unkempt blond hair and yellow eyes of the same color. His fingers, from the midsection onwards, are a vibrant purple hue.

He can frequently be spotted in a white t-shirt with a black cardigan with a black neck tie, Pearl chains cascade down from the top of his shoulder blades, while a sizable and lengthy bow is positioned at the back of his collar. He dons a pair of black, ankle-length slacks and plain white shoes. His height is 6'1.