Daigo Aoyama

Daigo Aoyama is a police officer in the Seraph of the End: Guren Ichinose: Catastrophe at Sixteen manga. While investigating the murders of high school girls, he would also return to his home in the area to see his sister, Mizuna Aoyama. The religion his father was involved in would affect his life again, and he would meet Guren Ichinose who was involved with the case.

Appearance
He had short light colored hair. A a boy Daigo was seen wearing a light hoody like top and dark capri like pants. When a police officer, Daigo wore a shirt and tie under a jacket in addition to a police hat.

Personality
Horrified at the site of someone murdered, Diago would become increasingly agitated at how the matter was being handled. Feelings of frustration at who he saw as a civilian in a crime scene, in addition to Guren interacting with the body resulted in anger at the scenario. Suspicions that Guren was the culprit, and other officers behaviour led him to believe that a cover-up was underway which he acted to address in order to defend others. When distressed, Daigo could be overcome with emotion yet it did not stop him thinking critically, neither deter him from doing what he thought was right.

History
Ten years ago as a boy Daigo was thrown into a surface by his father. With his younger sister Mizune tending to him, Daigo raises with his father how since mother died he has been drinking so much, and what happened. Speaking that his father was addicted to a strange religion and they are taking his money, Daigo implored his father to wake up. Older, Daigo had a band aid on his head when telling Mizuna that he was leaving home. Stating he had to leave, Daigo said one day he will come back and take care of Mizuna. Ever since he fought with father when a junior high school student, Daigo ran away from that city leaving behind his younger sister.

Story
While the Aichi Police Inspector and another officer nonchalantly consider the murdered girl before them, Daigo is alarmed at the sight of her bound to a wall. Daigo remarks to them both that this is part of the rapes and murders of junior high students in Aichi. Shocked to learn that there have been twenty such cases, Daigo raises there has only been six publicized. Startled that the sorcerer coming to the crime scene is in charge of Mikado no Tsuki, he asks why does the name of such a suspicious organization come to mind so quickly. Questioning whether the Aichi prefectural police is truly stupid, and whether there are no non-believers, Daigo wonders whether everyone here is a fervent supported of Mikado no Tsuki. Asking if this case is religious, Daigo raises are they trying to hide it. Stating that his parents were addicted to religion and that it messed up his childhood, Daigo affirms this case is condemnable.

After he is restrained on the floor by other officers for his words, Daigo asks if they think they will be forgiven. Telling them not to think they can erase an incident this large, Daigo states he will write about it on the Internet and sell it to the media to prevent a cover-up. With Guren joining them, Daigo questions why is he here. Increasingly disconcerted, he asks what they are saying that a Mikado no Tsuki sorcerer is here when this is a murder scene. Attempting to stop Guren from approaching, Daigo shares he is a police officer when called a civilian. Questioning whether the inspector is sure about letting the brat here, Daigo turns to see Shigure Yukimi, where Sayuri Hanayori arrives after. Shouting at Guren to not touch the corpse without permission, Daigo is then taken away by other police and says what is this. Addressing him as Guren ichinose from the Mikado no Tsuki Sect, with this being a religious affair, Daigo raises what if Guren himself is a spy, or the culprit. With Guren asking what if he is, Daigo vows he will catch him. Such a thing would not be allowed in modern times, a dubious religionist with powers in this rural area, Daigo affirms Guren cannot hide anything.

Waling back, Daigo is frustrated and considers what is this sorcerer from Mikado no Tsuki, then is concerned at a false religion that is eating this town. Contemplating the sky, Daigo notes the strange things in this town did not start recently. It is why he left home ten years ago, where Daigo's childhood with his sister and father are recalled. Returning to his childhood house, Daigo finds Mizuna. Asking how father is, Daigo suspects he is at a Mikado no Tsuki gathering then asks is he still obsessed with that suspicious religion. Saying he will talk to father when he comes back, Daigo adds he will take care of Mizuna and has bought a house just for this. Detailing that he became a police officer, Daigo adds he has a salary and it why he came back to this town.

Sleeping beside one another, Daigo is aghast when Mizuna asks for him to embrace her. Stating they are siblings, Daigo picks up on Mizuna’s comment of deeming herself unclean. Asking what she means, Daigo questions what did father do to her and was it inappropriate. He is shocked at hearing from Mizuna that he came back too late. With Mizuna mentioning that Tenkon said they will be able to birth mother and father, Daigo answers to not be insane, and who made her this way. As he wonders whether it was Mikado no Tsuki he is kissed by his sister. Falling back with tears, Daigo thinks this such a thing was the reason why he ran away. While he means to help her, Daigo sees that Guren has joined them, armed with a sword. At once, Daigo places his body in the way of Mizuna to defend her. After being knocked aside, Daigo moves to tackle Guren to stop him getting close to Mizuna.

His eyes widen as Mizuna places a fox mask on her face and a growth of flesh from her spine develops into a large upper torso of a long haired monster with a large clawed left hand, and a blade as the right arm. Kicked out of harms way by Guren as the monster attacks, Daigo processes that is Mizuna. Confirming with Guren she is his sister, when asked if he wants to save Mizuna he asks can Guren do such a thing. Hearing that Mizuna can be killed to remove the curse, or he can curse her to live, even if it is dirty and ugly, Daigo focuses on how Mizuna can be returned to normal. If Daigo curses Mizuna he will be cursed too and he cries that he wants to be with his sister. After a spell tag is placed on his chest, Daigo witnesses Guren cut apart the monster and is showered with blood. Looking around and asking where Mizuna is, he sees her above.

A few days later, Daigo locates Guren training near a stream. Enquiring if he is doing well, Daigo shares he intervened in the police and public reports, so as to make sure the issue is not blown up. Asking if Guren wants anymore than this, Daigo replies his sister is in hospital, one that Mikado no Tsuki manages. He adds that Mizuna woke up from a coma today. The person who cursed his sister, Daigo heard that he was not from Mikado no Tsuki and had been excommunicated decades ago. Bowing to Guren, and stating he was not the culprit, Daido adds thanks to him his sister was saved.

Mizuna Aoyama
While Daigo lived with his younger sister for a time, the conflict with their father resulted in him leaving her. Having become a police officer and brought a house, Daigo returns to take care of her as he promised. He comments on her odd habit of smelling him, and asks why she is sticking to him when seated right beside her where she is happy to see him again. While sleeping, Daigo would be baffled at the romantic overtones from his sister, and right away concluded that something had happened while he was away. He delivered on his words to help her by physically protecting her, and assisting in driving a monster that had emerged from her body away.

Aoyama's Father
His and Mizuna's father was pictured happy in a photograph of them together, including their mother. After his mother passed away Daigo commented on his father's drinking and was wary of the religion he had become involved in. For all his efforts to talk, Daigo was physically and verbally assaulted by his father. This would culminate in Daigo leaving where he had a injury on his head. Returning home, Daigo enquired about his father and intended to speak with him. While suspicious his father remained involved with the cult he was a part of, Daigo was not aware that his father had his throat cut by Mizuna some time ago when he intended to make a baby with her.

Guren Ichinose
Against his presence at the crime scene due to his age, and of the horrifying nature of the crime, Daigo is further intolerant of Guren at learning of his religious affiliation. Feeling that Guren may be a suspect or even the culprit leaves Daigo angered. Seeing him again, Daigo does what he can to protect Mizuna from who he regards as a hostile presence. After Mizuna is saved by Guren, he takes measures to thank him. Commenting that for someone like Guren with status, prestige, and power, Daigo questioned why did he want to become stronger. Daigo regarded Guren as someone who had everything.