Guren Ichinose/Relationships

Aiko Aihara
A sergeant of the Japanese Imperial Demon Army and leader of a fifteen-man squad in the Moon Demon Company during the conflict in Nagoya. She and only a few other soldiers returned after dealing with a noble vampire to where the others were meeting up.

Guren tells her to stay behind and to inform the other squads who would later arrive of where their locations would be and their next instructions. She accepts and in return the others with her are allowed to rest. Shortly afterwards when Guren and the others departed, they are assaulted by vampires including Lacus Welt, René Simm, and Mikaela Hyakuya. After being forcefully interrogated and the suicide of the other soldiers, she is ultimately slayed by Mikaela after revealing to him solely the plans of the Japanese Imperial Demon Army.

Yayoi Endo
A member of Makoto Narumi's squad. She died while fighting against vampires after Mikaela had taken away Yūichirō.

Norito Goshi
A member of Guren's squad since he was 15 back in high school prior to the apocalypse. He enjoys making fun of Guren. A member of the prestigious Goshi family.

Sayuri Hanayori
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. She teaches the students training in the Moon Demon Company. She has a crush on Guren.

Kureto Hīragi
The most likely to become the next leader of the JIDA. He and Guren have a rivalry dating back to high school. He respects Guren's intelligence and ability to produce bearers of Black Demons. He is ruthless and does not hesitate to torture hostages to make Guren or others talk. He suspects Guren is a spy for the vampires or may lead a coup against the Hiragi family, but he also says he trusts Guren and sends Guren on an extremely dangerous mission to Nagoya. A member of the prestigious Hiragi family.

Seishiro Hīragi
A higher-ranking member of the JIDA, he calls Guren a loser and tells him to get lost. A member of the prestigious Hiragi family.

Shinoa Hīragi
She is Guren's subordinate, and he assigns her to be the surveillance officer to both Yu and Kimizuki. Shinoa and Guren have a close relationship, and he says he would even let her kill him. Her sister is the demon inside Guren's sword. After learning that Guren has been experimenting on Yu, she asks him what his real intentions are. She becomes more concerned after learning that her sister may be influencing Guren behind the scenes. However, she remains loyal to Guren. A member of the prestigious Hiragi family.

Shinya Hīragi
Although he was adopted into the prestigious Hiragi family, he is Guren's friend. He joins Guren without orders to help him in the attack on Nagoya.

Tenri Hīragi
Leader of the Japanese Imperial Demon Army as well as the Hiragi family, he looks down on Guren, who is from a lower branch family.

Yūichirō Hyakuya
When Yuchiro escapes Sanguinem, Guren takes him in and trains him as a soldier and secret weapon of the Japanese Imperial Demon Army. Guren knows he was a survivor of the Hyakuya Orphanage and saves him with the intention of experimenting on him. Yu is one of the seraph of the end. They develop a close relationship, and Guren acts as a father/mentor figure to Yu. He can make Yu transform by giving him a certain drug. Yu does not recall any of the experimentation or the transformation.

Rika Inoue
A member of Makoto Narumi's squad. She escaped the slaughter of 2/5 of her squad and along with the others head to Nagoya airport after rescuing the other soldiers at Nagoya City Hall. Devasted by the loss of her comrades, she blames Shinoa due to her actions for allowing Mikaela to take away Yūichirō. Makoto calms her down before deciding for them to head back to the town hall and rescue Guren.

Soon after, Kureto arrives along with a considerable number of soldiers. Releasing the chains that delved for blood to activate the Seraph of the End, Rika ultimately becomes a victim and is pierced through the heart, killing her.

Shusaku Iwasaki
A member of Makoto Narumi's squad. Just like with Rika, he escapes the vampires' ambush and arrived at the Nagoya Airport. Soon after when Kureto arrived, he is brutally stabbed by several chains to help activate the Seraph of the End, dying soon afterwards after telling Makoto to run.

Mito Jujo
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. She appears to be tsundere toward Guren and confesses her feelings to him in volume 6 of Guren's light novels. However, he rejects her. A member of the prestigious Jujo family.

Taro Kagiyama
A member of Makoto Narumi's squad. He dies while fighting against the vampires after Mikaela had taken away Yūichirō.

Shiho Kimizuki
A soldier Guren experimented on. A wielder of a Black Demon. Although he does not want to work with Yu, Yu eventually wins him over. His sister, Mirai Kimizuki, is under hospital care. A member of Shinoa's squad.

Makoto Narumi
A member of his own squad. He suffers the loss of Yayoi and Taro when the vampires ambush them after Mikaela has taken away Yūichirō. Along with most others, he escapes and arrives at the airport. He prevents Rika from killing Shinoa out of anger and resent, but also turning on Shinya and proclaiming that he and a few others will head back to the town hall and rescue Guren.

When Kureto arrives, he's wary of the Lieutenant General and refuses to rest. Later on he openly confronts Kureto about his plans and everything he's suffered. When the chains are released, he witnesses the death of the rest of his squad. Before he could attack Kureto for revenge and be slayed on the spot, he is helped by the Shinoa squad.

Aoi Sangu
She is the personal assistant of Kureto Hiragi. She arrives with him to the airport and releases the chain on his orders, ultimately resulting in the many losses of lives for their blood to activate the Seraph of the End.

Mitsuba Sangu
A soldier of the Moon Demon Company. She works under Shinoa as part of her squad. She disagreed with the decision to put her on a squad of rookies, but she later bonds with them. A member of the prestigious Sangu family.

Yoichi Saotome
A soldier Guren experimented on. A wielder of a Black Demon. He becomes Yu's first official friend. A member of Shinoa's squad.

Shigure Yukimi
A member of Guren's squad since she was 15 back in high school prior to the apocalypse. She does not speak often.

Ferid Bathory
An extremely powerful vampire, he works with Mika. Ferid plays with Guren on the battlefield at Shinjuku, though it's revealed later that he and Guren had been working together for some time, which explains a lot of the supposed coincidences throughout the story.

Mikaela Hyakuya
A powerful young vampire, who nearly kills Guren during the battle at Shinjuku. Guren calls him a naive brat. He turns out to be Yu's less-than-dead best friend and adopted family member. Guren agrees to help Yu get Mika back. A survivor of the Hyakuya orphanage and a seraph of the end.

Saitō
A vampire disguised as a modified human working for the Hyakuya Sect.

Mel Stefano
A nineteenth progenitor that Guren had difficulty fighting against, resulting in the losses of many lives while in the process of doing so.

Krul Tepes
Guren first met Krul once she arrived at Nagoya. Shortly after, Mahiru overtook his body and commanded Krul's assistance in an experiment at the airport. This told the ruler of Sanguinem that Guren and Mahiru, a woman she knew from eight years past, were connected.

Asuramaru
The demon Yuichiro Hyakuya makes a contract with. He has a connection to Guren.

Mahiru Hiragi (Mahiru-no-yo)
Guren's former fiancée and lover. Inventor of the Cursed Gear, she eventually becomes consumed with her research and becomes a demon. Guren kills her, and she becomes the demon in his sword. Shinoa Hiragi's elder sister. Despite her impressive genius, all she wants is to love Guren. Though while she might let Guren take the lead for the most part, she's not above possessing him to achieve her own ends, which she proves in Nagoya.

Noya
A demon prepared by Mahiru, whom Guren forms a contract with in volume 4 of Guren Ichinose: Catastrophe at Sixteen.