Hisaka is of average height with pale skin and black hair. His eyes are his most striking feature, said to be as 'blue as lightning'. Those who have seen Lord Archane notes that they have 'similarities', while Fyrre Vier is almost certainly his sibling or twin in terms of appearance.
He has a preference for blue and dark colors. For some reason he likes clothes that covers as much skin as possible, like turtlenecks and long-sleeved shirts. Cloaks are also an indispensable part of his attire. He also wears a pendant shaped like a stylized sun, after discovering that his name meant "eternal summer" in an ancient eastern language.