Seiren, born Hoshino, is a student of the Night Class at Cross Academy and the unofficial bodyguard/faithful follower of Kaname Kuran. Seiren is a tall and pale-skinned young woman with chin-length silver-lavender hair that has bangs stopping just above her eyebrows and silver-lavender eyes. As a child, Seiren had shoulder-length hair. Seiren seems to be a no-nonsense type of girl, who can always be trusted to get her job done. She can seem cold, but is very loyal. She is a very quiet and enigmatic character who only speaks when necessary. Seiren may come across as harsh at first, and she can get irritated very quickly. Some say she can be a little too serious. Once Seiren befriends a person, she will defend them to her last breath. It is not wise to threaten her or others she knows, as she will kill without hesitation. As Hanabusa Aido points out, Seiren has never been known to lie.