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Family[edit | edit source]

Nagisa Akatsuki[edit | edit source]

As she is his sister, he is very protective of her, but he has no siscomplex with her. He was surprised when he learned that Nagisa is a hybrid and Avrora's soul is inside her, but that does not change anything as he still considers her his sister and takes care and protects her from danger.

He is willing to go through great lengths for her; he once risked his life just to retrieve her straw hat that was at the edge of a cliff when they were younger. He also cares for her dearly. This is shown in Return of the Alchemist, wherein he sees the almost dead Asagi and loses control of his powers, but quickly stops when reminded of his sister.

Mimori Akatsuki[edit | edit source]

She is Kojou and Nagisa's mother. He loves her and cares about her and keeps her away from harm as much as possible. Presumed to be divorced to their father, she gave Nagisa the chance to be a hybrid. He doesn't know that she knows about him being the Fourth Primogenitor.

Hisano Akatsuki[edit | edit source]

She is Kojou's grandmother. Kojou descries her as a "pretty strict old lady", similar to Gajou's depiction of her.

Gajou Akatsuki[edit | edit source]

Kojou's father. Kojou's relationship with him is a little rocky as Gajou can be an irresponsible and careless parental figure, but they still love each other nonetheless.

Reina Akatsuki[edit | edit source]

It is assumed that they have a loving father-daughter relationship. Daughter of Kojou Akatsuki and Yukina Himeragi. She is similar to Yukina but is taller and has bigger breasts. She has blue eyes like Kojou and is also a vampire.

Moegi Akatsuki[edit | edit source]

It is assumed that they have a loving father-daughter relationship. Daughter of Kojou Akatsuki and Asagi Aiba. She has violet eyes, blue from her father and red from her mother, Moegi is also a vampire.

Wives[edit | edit source]

Yukina Himeragi[edit | edit source]

A 14-year-old Sword Shaman from the Lion King Organization, Yukina was sent to observe the fourth primogenitor and was told to kill him if he becomes a threat. She despised him at first, but eventually grew to accept him. She is constantly following him everywhere he goes as his observer and as a result, has become very close to him. She was actually sent for this very purpose with the organization intending for her to be his first blood partner and even his mate.

In Strike the Blood EX, they are implied to be married, and have a daughter named Reina Akatsuki

Asagi Aiba[edit | edit source]

Asagi Aiba is Kojou’s classmate and best friend. Kojou and Asagi have known each other since middle school and Asagi has had strong feelings and a crush on Kojou ever since. Before Kojou became a vampire were Asagi and Kojou always seen together with Motoki Yaze. But since Kojou became a vampire have both Asagi and Kojou been spending less time together since Yukina Himeragi came into their lives and when Kojou’s life starts to change. Kojou then starts to spend his time more with Yukina instead. Kojou is also more absent from school and is less present in Asagi’s life. Both Asagi and Yukina have shown jealousy whenever Kojou is seen spending time with either of them. Early into the series, has Asagi both confronted and question Kojou’s relationship with Yukina.

In Strike the Blood EX, they are implied to be married, and have a daughter named Mogei Akatsuki.

Avrora Florestina[edit | edit source]

Avrora was one of the containers of original Fourth Primogenitor's beast vassals, who passed down the powers to her servant, Kojou. Although Kojou cannot recall any of his memories from the time he was with Avrora, he occasionally remember segments from his past. Avrora Florestina resided inside Kojou's sister, Nagisa, before being transfered into Hektos, another container of the original Fourth Primogenitor's beast vassals.

She becomes Kojou's wife.

Yuuma Tokoyogi[edit | edit source]

Young Kojou, Yuuma and Nagisa

Yuuma is Kojou's childhood friend. They met when Kojou forced Yuuma to help retrieve Nagisa's hat at the edge of a cliff. Since then, the two along with Nagisa often played together before growing distant.

During the events of the Labyrinth of the Blue Witch, Yuuma and Kojou temporarily switched bodies.

She becomes Kojou's wife.

In season 4, Yumma returns to save asagi from being attack by Kasugaya Shizuri Castiella and the larvae on the highway. Yumma would be teleported with Kojou, Asagi, Yukina, and tank rider to the online island. On the online island they would battle against Magatoki Kato, Also known as the ouma witch, in which yumma would copy her magic book to defeat her with Kojou and co.

Sayaka Kirasaka[edit | edit source]

She is a friend of Yukina Himeragi. Sayaka was ordered by the Lion King Organization to take charge of multinational magical crimes in the Foreign Affairs Division. She is the observer of Dimitrie Valte part time, just as Yukina was observing Kojou Akatsuki. Sayaka is very protective of Yukina, having known each other since childhood. They initially had a rough relationship; she was upset that Kojou made Yukina his blood partner, and blamed Kojou for involving Yukina in dangerous situations. She has androphobia (fear of men), which may have affected her early judgement of Kojou. Sayaka later takes a liking to Kojou, and allows him to suck her blood to unlock a new Beast Vassal. Similar to Yukina, she gets irritated when Kojou is seen with other girls. 

In the Dengeki Bunko official  short story, Reina appears/Courthouse confrontation, Reina indirectly says she is Kojou's wife in the future.

She becomes kojou 's wife

La Folia Rihavein[edit | edit source]

She is the eldest Princess of the Aldegyr Kingdom. Sayaka briefly mentioned about her in Episode 9 when she told Kojou that she was sent as an observer of La Folia. La Folia was seen by Kojou and he first thought her to be Kanase.

She becomes Kojou's wife.

Kanon Kanase[edit | edit source]

She was a girl who was experimented upon by her adoptive father who had almost turned her into an artificial angel. La Folia revealed in Episode 11 that she was her aunt, as she was a child of her grandfather who had an affair with a Japanese woman, that at the later part of Amphisbaena arc was identified as Kanase Kensei's sister. She calls Kojou ”Brother”.

She becomes Kojou's wife.

Kiriha Kisaki[edit | edit source]

She is the dark sword shaman that appears in the season 2 of the anime.

She becomes Kojou's wife.

Yume Eguchi[edit | edit source]

She is the vessel of Lilith, the world's strongest succubus. The bullying that Yume had gone through because of her mind-control magic made her think that her existence will always cause problems and harm to others, and she could not kill herself in a simple way because Lilith would simply find another suitable vessel and that person would also have to suffer. So she decided to assist Taishikyoku in their plan to control Leviathan, the strongest living weapon from the ages of the gods as she is the being with the strongest mind-control magic, only to betray them and reveal her true goal which was to die inside Leviathan, which has the ability to dissipate any entity into nothing and which will kill her along with Lilith. But Kojou saves her and gives her a meaning to her life.

She becomes Kojou's wife

Yuiri Haba[edit | edit source]

She is a Sword Shaman from the Lion King Organization. Yuiri first discovered the existence of Kojou through rumors spread at High God Forest. She was also nominated as a candidate for becoming Kojou's observer. As an avid reader of romance manga, Yuiri fantasized about developing a romantic relationship with him. However, she was not selected because she could not skillfully employ a Schneewalzer, as well as consideration for her family.

She has feelings for him, and is jealous whenever Koujo and Yukina are very close.

She becomes Kojou's wife

Shio Hikawa[edit | edit source]

she becomes kojou's wife

Kasugaya Shizuri Castiella[edit | edit source]

Introduced in Season IV Episode 1

She first introduces herself as Kojou's watcher.

She becomes Kojou's wife

Friends[edit | edit source]

Motoki Yaze[edit | edit source]

He is Kojou's friend and classmate whom he met during middle-school alongside Asagi. He's 16 years old. Motoki is also a member of the Lion King organization and the real observer of Kojou, the fourth primogenitor. He is also Asagi's childhood friend and therefore often encourages her pursuit of Kojou. He's currently going out with Koyomi Shizuka and has told Kojou and Asagi that she's his girlfriend, despite having not held her hand according to Natsuki. He is an Esper who has the ability to manipulate special sound waves, but needs certain drugs or enhancers to strengthen his ability. Kojou does not know that Motoki is his real observer and it is unknown what his reaction would be if he became aware of it.

Natsuki Minamiya[edit | edit source]

She is a teacher at Kojou's school and also the Witch of the Void. Kojou always calls her "Natsuki-chan," probably due to Natsuki's body size and childish face. Although, this somewhat insulting nickname doesn't mean that Kojou respects her less than any older figures in his life, since Natsuki is the only adult that he had explicitly respected, as shown by the OVA.

Astarte[edit | edit source]

She was an artificial life form who had a Familiar installed in her. Kojou saves her and she later becomes a maid for Natsuki.

Others[edit | edit source]

December[edit | edit source]

She was the seal the of the 10th familiar. It is unknown how far her feelings is to Kojou but before she disappeared it seems she has grown to love him to extent that to live him a goodbye kiss.

Glenda[edit | edit source]

She can turn into a dragon when she gets emotional. She is also a protector of Cain.

Nina Adelard[edit | edit source]

In their brief interaction in Alchemist arc, both of them can interact with each other, with Kojou taking the tsukkomi role to Nina's mischievous personality.

Dimitrie Vatler[edit | edit source]

Kojou is wary of him, as Kojou sees him as someone that's ruthless and doesn't care about the well being of Itogami Island at all, doing thing merely in the pursuit of pleasure with questionable methods. He can't understand Vatler's way of reasoning, just like the majority of the cast. However, Vatler's over-friendly gestures towards him sometimes make people misunderstand their true state of relationship, thinking that he's close to the older vampire. However, in volume 15, Kojou admitted to Vatler that despite the latter's tendencies to create problems in Kojou's life, he can't really "hate him to the bone."

Kira Lebedev Voltisloa[edit | edit source]

Kojou seems quite relaxed with Kira, as the latter doesn't intimidate him and always treats Kojou and his friends nicely. His relaxed demeanor around him even made Asagi think that Kojou is into men.

Tobias Jagan[edit | edit source]

Kojou doesn't have a civil relationship with Tobias the way he has with Kira. This could be attributed to Tobias' belligerent attitude towards him, that he showed freely by throwing insults to Kojou here and there when Kojou experienced some difficulties, that in Tobias opinion translated as "incompetence." However, their relationship seems to have improved when Tobias apologized to and even thanked Kojou at the end of Volume 15.

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