Yan is a light-skinned man with white hair with black streaks tied into a long side ponytail. Much like other notable members of the Index, he dons a white cloak fitted with gold ornaments over a black suit. As a Messenger, Yan was bestowed a personalized greatsword adorned with golden chains and a lock that he is always seen carrying. He has carried out many questionable Prescripts which have led to the deaths of his loved ones and He can not go home until he finishes reading the value of E.