Characters
Main Characters

Kojō Akatsuki (暁 古城 Akatsuki Kojō?)
Voiced by: Yoshimasa Hosoya
Kojō was a normal high school student 3 months prior to the beginning of the story, until becoming the 4th progenitor after his predecessor, Avrora Florestina inserted her spirit into his body as the result of a wish. He claims to remember nothing of the incident. When aroused, his blood lust takes over and the only way to satisfy it is to drink his own blood, usually from the nosebleeds he experiences. As a vampire, Kojō possesses superhuman strength, speed, reflexes, and durability, but is much more powerful than normal vampires due to his status. He has also inherited Avrora's twelve familiars. Due to never having drank human blood, Kojō at first has no control over his powerful familiars, but after drinking an individual's blood, one familiar will acknowledge him as their master. By drinking the blood of others who have familiars, he is able to gain control over their familiar. By volume 9, he is able to control 6 of the familiars.

Yukina Himeragi (姫柊 雪菜 Himeragi Yukina?)
Voiced by: Risa Taneda
A middle-school Sword Shaman from the Lion-King organization, Yukina was sent to observe the 4th progenitor and was told to kill him if he becomes a threat. At first, Kojō tries to trick her into thinking he's the wrong person, but his strength is revealed when he intervenes in a fight between her and another vampire. She is constantly following him everywhere he goes and as a result has become very close to him, even allowing him to suck her blood in order for him to gain control over his familiars. Unbeknownst to her, she was actually sent for this very purpose; with the organization intending for her to be his first blood partner, and even his mate. Like many others, she was supposedly sold to the Lion-King organization by her parents. By the end of the first arc, she seems to have developed feelings for Kojō.

Sayaka Kirasaka (煌坂 紗矢華 Kirasaka Sayaka?)
Voiced by: Ikumi Hayama
Yukina's ex-roommate and a War Dancer from the Lion-King. She is highly over-protective towards Yukina. At first, she despises Kojō for being close to Yukina, but further on begins to develop feelings for him. Like Yukina, Lion-King actually arranged the meeting between Sayaka and Kojō, intending for her to become his second blood partner and mate.

Asagi Aiba (藍羽 浅葱 Aiba Asagi?)
Voiced by: Asami Seto
Asagi is Kojō's friend and classmate. She is an expert programmer and works for the Manmade Island Management Corporation. She has a crush on Kojō and she kissed him in the end of Episode 8. Despite knowing that the island is deeply connected to supernatural personalities and creatures, she had no idea that her friends are among them until Kojō and Yukina finally revealed their true identities to her in Volume 7. She is nicknamed Cyber Empress.

Motoki Yaze (矢瀬 基樹 Yaze Motoki?)
Voiced by: Ryōta Ōsaka
Kojō and Asagi's classmate. Motoki is also a member of the Lion-King organization and the real observer of Kojō, the 4th progenitor. He is also Asagi's childhood friend and therefore often encourages her pursuit of Kojō. He's currently going after Koyomi Shizuka and has told Kojō and Asagi that she's his girlfriend, despite having not held her hand according to Natsuki. He is an Esper who have the ability to manipulate special sound waves, but needs certain drugs or enhancers to strengthen his ability.

Nagisa Akatsuki (暁 凪沙 Akatsuki Nagisa?)
Voiced by: Rina Hidaka
Nagisa is Kojō's younger sister. She is usually chatty with people she likes, including Yukina, who happens to be her classmate. She is the only main character who knows nothing about the supernatural incidents as the others conceal such information to protect her. Four years ago, she almost died after being involved in a train accident caused by demons, which traumatizes her whenever she sees one.

Ayami Academy

Natsuki Minamiya (南宮 那月 Minamiya Natsuki?)
Voiced by: Hisako Kanemoto
Natsuki is Kojō's English teacher and an attack mage. Despite claiming to be 26 years old, she has the appearance of a grade school girl. She is usually seen wearing a gothic lolita dress. She is one of the few people who knows that Kojō is the 4th progenitor. She is high ranking mage and is called "The Witch of the Void". It is later revealed that she is actually the guard of the magical prison that houses the most dangerous supernatural criminals; her actual body is sealed deeply in the prison, while it's actually an illusion that appears as a teacher and mage. Kojō, Aiba, and Yaze usually calls her "Natsuki-chan" but she usually orders them to address her as "sensei."

Kanon Kanase (叶瀬 夏音 Kanase Kanon?)
Voiced by: Kanae Itō
A blond hair middle-school girl who is Nagisa's friend. She has the same appearance as La Folia as her biological father is La Folia's grandfather. She was part of Kensei's experiment to turn her into an Angel Faux.

Rin Tsukishima (築島 倫 Tsukishima Rin?)
Voiced by: Rei Mochizuki
Kojō's classmate and Asagi's friend.

Lion King Organization

Koyomi Shizuka (閑 古詠 Shizuka Koyomi?) / Paper Noise (静寂破り（ペーパーノイズ） Pēpānoizu?)
Voiced by: Kana Ueda
The 3rd leader of the organization who ordered Yukina's mission. She appears as a senior school student who wears glasses.

Others

Dimitrie Vatler (ディミトリエ・ヴァトラー Dimitorie Vuatorā?)
Voiced by: Yūki Ono
A pure-blood vampire who is a direct descendant of the First Progenitor. He is in love with the previous Fourth Progenitor, Avrora and becomes interested in Kojō after her death. He becomes the Ambassador in the Embassy of the Warlord's Dominion after the Nalakuvera incident.


Avrora Florestina (アヴローラ・フロレスティーナ Avurōra Furoresutīna?)
Voiced by: Kaori Ishihara
The previous Fourth Progenitor, a young girl who passed her title to Kojō after her death.

Rudolf Eustach (ルードルフ・オイスタッハ Rūdorufu Oisutahha?)
Voiced by: Kenta Miyake
A combat deacon of Lotharingia who comes to Itogami City to retrieve the right arm of a saint from the West European Church. He initially controls Astarte until his defeat at the hands of Kojō and Yukina.

Astarte (アスタルテ Asutarute?)
Voiced by: Yuka Iguchi
A homunculus that controls a Familiar. She currently serves Natsuki.

Christoph Gardos (クリストフ・ガルドシュ Kurisutofu Garudoshu?)
Voiced by: Eizō Tsuda
The leader of the Black Death Emperor Faction and a former soldier of the Warlord's Dominion.

Mogwai (モグワイ Moguwai?)
Voiced by: Shinji Kawada
Asagi's virtual partner who assists in her hacking missions.

La Folia Rihavein (ラ・フォリア・リハヴァイン Ra Foria Rihavuain?)
Voiced by: Saori Ōnishi
The princess of Aldegyr. She was pursued by Magnus Craft for her blood of the Aldegyr royal family. She later became Kojō's third blood partner to activate his third familiar to save Kanon.

Kensei Kanase (叶瀬 賢生 Kensei Kanase?)
Voiced by: Yutaka Aoyama
The leader of Magnus Craft. He is Kanon's adopted father whose younger sister is also Kanon's biological mother. He was a former royal court mage at the palace of Aldegyr. He had plans to make Kanon into a weapon to defeat the Fourth Progenitor.

Beatrice Basler (ベアトリス・バスラー Beatorisu Basurā ?)
Voiced by: Satomi Arai
An employee of Magnus Craft. She wields a spear containing the Familiar "Jabra".

Lowe Kirishima (ロウ・キリシマ Rou Kirishima?)
Voiced by: Yūki Hayashi
An employee of Magnus Craft. He can morph into a beast.