Sermung has brown eyes, brown hair, average height, and a plain face. He often wears his famous overcoat of white, gold, and black.
According to Garovel, Sermung is honorable, intelligent and had a presence that was overwhelming to be around, although that last might have been just soul pressure.
Little has been revealed about Sermung's history besides that he is about 600 years old and that he has been an emperor and in charge of Vanguard for about 200-300 of those years.
Sermung's power has not been revealed, although he has been described as strong enough that he could likely take on both Dozer and Morgunov at once in a fair fight.