Seiren

Seiren (星煉, Seiren) is a student of the Night Class at Cross Academy. She is Kaname Kuran's unofficial bodyguard and faithful follower.

Appearance
Seiren is a tall woman and has a pale complexion, shared by many of the Night Class vampires. She has short, silver-violet hair and eyes of the same colour, with bangs that stop just above her eyebrows.

Personality
Seiren seems to be a no-nonsense type of girl, and 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 Aido points out, Seiren has never been known to lie.

History
Seiren was originally born as a human girl named Hoshino. She was bought as an infant and raised to become a sacrifice for Kaname to feed on. When shown to Kaname, she and another sacrifice, Yoruno, gladly offered themselves to him. She believed that by letting Kaname drink her blood, she would be allowed to go to heaven. Instead of drinking their blood though, Kaname rescued both Hoshino and Yoruno by taking them to Cross Academy. However, on their way to Cross Academy, Yoruno ran back, fearing that if she didn’t offer herself, she would go to hell.

Hoshino ran after her in order to stop her, only for the both of them to be caught by aristocrat vampires. While Yoruno died from the loss blood, Hoshino was on the verge of death when found by Kaname. He gave her the option to die or to live the life of a vampire. She chose to live, and Kaname turned her into a full-fledged vampire, while giving her a new name, Seiren. To show her gratitude, she trained in martial arts in order to stay by Kaname's side. Seiren is known to be one of the only people (apart from Yuki) to be aware of Kaname's true nature.

Plot
Seiren is first seen following Kaname as he accepts gifts from a crowd of admirers. In every appearance, her role is usually to assist Kaname in some way.

Seiren is usually the first to defend Kaname from anyone she regards as a threat. For example, she barely refrains from killing Zero Kiryu when he points the Bloody Rose at Kaname. Seiren also appears to serve Kaname in the capacity of a spy or informant. She is often seen in the background ever watching for danger or hidden to retrieve information which makes her mostly a loner. After Rido Kuran was killed, Seiren continues following her master, Kaname. Seiren is a highly trusted vampire, as when Kaname and Yuki return to the Kuran mansion in secret, Seiren is already there having prepared their quarters.

After Kaname sacrificed himself, she continued to serve Yuki. However, she did not appear alongside Yuki when Kaname was turned into a human, which could indicate that she is no longer in the service of the Kuran family and has gone her own way.

Powers & Abilities
Seiren's main choice of weapon is her body. Being highly skilled at various martial arts as well as ninja-like weapons, Seiren is able to quickly subdue multiple opponents. In fact, she mostly acts similar to a ninja when it comes to her "job", and is very agile. Also, as a vampire she possesses the ability to erase minds and put people to sleep when ordered (though this is a common ability for all vampires). She also has the ability to heal very quickly.

Relationships
Kaname Kuran

Seiren is fiercely loyal to Kaname, and serves him as his unofficial bodyguard. Kaname greatly trusts her and sometimes relies on her to obtain valuable information.

Yuki Kuran

As a member of the Kuran family and as Kaname’s sister/lover, Yuki has Seiren’s loyalty. By the time Kaname is resurrected, though, Seiren has left the Kurans’ service.

Toga Yagari

In 86th Night, for some reason, Toga rescues her from the rubble. In 93rd Night, they are shown together. Perhaps this is a hint that they became a couple.

Quotes

 * "Kaname-sama, I'll hold those for you."

Trivia

 * The meaning of her name: Sei means "star" and Ren means "To smelt" or "refine." Ren is also the same kanji used in Rengoku, or "purgatory".
 * Seiren Vampire Level: Level C
 * Seiren Vampire Abilities: Jujitsu (A form of Mixed Martial Arts)
 * Seiren Good at P.E.
 * Seiren Family Unknown.
 * Unlike the majority of the Night Class, Seiren was a human-turned vampire like Zero.
 * Ai and Ren refer to Seiren in past tense in Vampire Knight Memories, implying she died in the last 100 years.