Saitō/Relationships

Mahiru Hīragi
A teenage girl born from the Hīragi family. She joins the Hyakuya Sect to oppose her family. Saitō tells her to become a vampire and though refuses to turn her himself he helps Mahiru whilst also keeping his own objectives a secret.

Mikaela Hyakuya
A young seraph with high experimental potential. He acts as a leader toward the other orphans and is considered to be charming. He is half-Russian with blond hair and blue eyes. Saitō gives him money to buy ice cream. Mika's mother was a member of the Hyakuya Sect and gravely injured him by throwing him out of a moving vehicle. His parents died during the subsequent car crash and Saito delivers him to the Hyakuya orphanage.

Yūichirō Hyakuya
A young seraph who Saitō picks up after his mother attempts to burn him alive in their apartment and then lights herself on fire and commits suicide. His father was also abusive. Saitō takes him to the same orphanage as Mika a few minutes before the Apocalypse begins, and Yu fights him the whole way. At some point he orders his men at the Hyakuya Sect to infiltrate the building in Osaka where he is being held disguised as Kureto's scientists in order to capture him which he retrieve him successfully.

Guren Ichinose
The heir to the Ichinose family and one who opposes the Hīragi family. Saitō encounters him multiple times after a weak attempt to assassinate him, repeatedly offering an alliance persistently. Ferid later reveals that Saitō was only using Guren to his own benefits all along.

Sika Madu
Sika Madu, the First Progenitor, was the one who turned Saitō into a vampire. According to Saitō, he disregarded almost everyone in the vampire race except for Ashera Tepes, because he was bored and was not interested in them anymore.

Ferid Bathory
Saitō turned Ferid into a vampire. He disregarded Ferid because he did not act according to his expectations.

Crowley Eusford
Crowley was turned into a vampire using Saitō's blood. It is unknown if Saitō is aware that Crowley is sired from him.

Krul Tepes
Saitō meets her while she is imprisoned in Ferid's mansion. She recognizes him as the one who tagged behind the First Progenitor and he talks to her about how the First was only interested in her brother Ashera Tepes.

Urd Geales
Urd meets Saitō at Ferid's mansion while Krul was imprisoned. He addresses Saitō as Rigr Stafford and cuts off his arm. Saitō asks if Urd is bored following the laws established by the First Progenitor and tells Urd to leave Japan. Urd questions him and says Saitō is no longer a vampire. Saitō reveals he worked with humans before leaving. Urd wonders if Saitō is bored of living. Saito targets Urd's aircraft with a large scale missile attack.

Basteya Irclu
Although they never met, Basteya addresses him as lord Rigr Stafford revealing that he is the one in control and they just simply play their part. This is evident further when he sided with an agent from the Hyakuya Sect to retreat from the battlefield.

Asuramaru
Originally a vampire Ashera Tepes, Saitō along with Urd Geales were witnesses when the first progenitor, Sika Madu disappeared with him 1,000 years ago. Sika intentionally turned him into a demon against his sister Krul Tepes wishes which he ignores. He and Urd waited for Ashera to wake up soon after his transformation, Saitō says along with Urd that they will have to teach him control his thirst for blood.