Aoi Sangū interacts with various other characters throughout the Seraph of the End series, which affects herself and the story. This article details Aoi's relationships with other characters.
Family[]
Mitsuba Sangu[]
Though they are sisters, Aoi and Mitsuba are not on good terms with one another. Aoi normally gives her the cold shoulder, and ignores her hourly. One example of this is when she arrived at Nagoya Airport with Kureto, Aoi notices her younger sister but turns her head from her, and does not say a word. Later, when she talks to Shinya in prison, she claims the Sangu clan has "no need for weakling and traitors" like Mitsuba. Further, once they meet again after Mitsuba's departure from the JIDA, Aoi makes it clear that she does not acknowledge Mitsuba as a sister anymore after betraying them in her mind.
Japanese Imperial Demon Army[]
Kureto Hīragi[]
Aoi is Kureto's personal assistant, and is extremely loyal to him. She follows his orders without question, and even agrees when Shinya calls her Kureto's pet. She secretly has a crush on him, however he is unaware of it.
Shinya Hīragi[]
They attended the same meeting to ascertain whether Yu was a traitor to the army where Shinya was also a suspect. At Nagoya airport, Aoi motioned for her sword when Shinya had his rifle materialise in response to what was planned. She meets him while he is in prison, and tells him to "act like a Hiragi". In anger he simply calls her Kureto's pet, which she agrees with.
Tenrī Hīragi[]
He is the head of the Hiragi family. He threatens to keep Aoi as a hostage if Kureto does not obey his orders.
Seishirō Hīragi[]
A member of the Hiragi family and when he threatens to inform Tenri of Kureto's plans, Aoi takes Kureto's side in the matter by killing his guards.
Mirai Kimizuki[]
Kimizuki's younger sister is used in human experiments. Aoi would monitor them and prepare Mirai as a weapon to use against the army's foes.
Moon Demon Company[]
Guren Ichinose[]
Aoi went to high school with him during their time as teenagers, although they did not interact too much.
Mito Jujo[]
They knew each other during their time in school.
Yuichiro Hyakuya[]
A black demon-wielder under Guren's command. He attempts to strike at Kureto from behind with Aoi blocking the attack but says he is strong.