Reinhard van Astrea/Relationships

Heinkel Astrea
In the past, Reinhard's father, Heinkel, was the only one who stood by him when everyone blamed him for his grandmother's death due to him inheriting the Divine Protection of the Sword Saint at an inopportune time. However, after his mother fell into a coma, Heinkel gradually became an alcoholic and started neglecting his son. At present, Reinhard has a very toxic relationship with his father, such as allowing him to use his standing as the Sword Saint to maintain his position in the Royal Guard. Ultimately, what remained of their familiar bond was shattered when Reinhard killed the reanimated corpse of his grandmother, causing Heinkel to vow to ruin his son's reputation.

Louanna Astrea
As Reinhard was only two years old when his mother, Louanna, fell into a coma, it is unknown if he even remembers her from before that.

Theresia van Astrea
Theresia was possibly the dearest relative he ever had. Reinhard worried a lot about her and became discouraged when he heard that she died. Sometime later when the Witch Cult resurrected her, Reinhard killed her with ease because for him his grandmother was dead and that thing was a corpse, following into more conflicts with his grandfather Wilhelm.

Wilhelm van Astrea
Wilhelm's relationship with his grandson is very tense, likely because Reinhard inherited his wife's power as the sword saint just before she died, making her much weaker than she was at her prime. Nevertheless, Wilhelm did want to fix their relationship after the Hakugei was successfully killed. However, after Reinhard was forced to kill Theresia's resurrected corpse, Wilhelm asked his grandson if he had any regret doing so. After hearing Reinhard's answer, he begins calling the current Sword Saint by his full name, showing that he sees him now as a stranger rather than his grandson.

Natsuki Subaru
Due to Reinhard's friendly and accessible personality, he easily befriended Subaru without thinking of him as inferior to him, despite himself being better than Subaru in every aspect imaginable. After Subaru's impressive feats of defeating the White Whale and the Sin Archbishop of Sloth, Reinhard started thinking of Subaru as his equal and was perfectly fine with relying on him, despite Subaru majorly lacking in strength, speed and battle experience. Together, they were able to defeat Regulus Corneas, whose Authority of Greed made him immune to outside interference, giving even Reinhard some trouble.

Felt
After the events of Arc 1, Reinhard took it upon himself to make Felt the 42nd King of the Dragon Kingdom of Lugnica. Ever since the Royal Selection Ceremony, the two of them are inseparable, partially due to the nature of their relationship - Reinhard being Felt's knight. The two of them engage in one-sided banter which often starts due to trivial reasons such as "Reinhard not being human" or "Reinhard being too perfect for a man". Naturally, Reinhard happens to be the one who the blame shifts onto. To an outsider, their relationship might appear as something rather novel and wholesome, however, even after having spent more than a year together, Felt still hates Reinhard, causing her to frequently lash out at him, as mentioned above. They're well-known throughout the Kingdom for having a very unorthodox relationship which breaks the bounds of normality, however, Felt doesn't consider the idea of "normalcy" as something one should bother with, hence she usually meets such observations with an air of hostility, which usually forces Reinhard to intervene and quickly resolve any potential disputes.

Despite such treatment, Reinhard displayed extreme devotion and affections towards his young mistress, always putting her before himself or anyone else. He disregards orders if they don't align with Felt's and is even prepared to forsake his duty as a knight, if the situation calls for it or if Felt is in danger. Sadly, this was sometimes used against him, as seen when his father Heinkel Astrea used Felt for his own advantage and forced Reinhard to guard him in order to make sure nothing bad happens to Felt.

Julius Juukulius
Julius and Reinhard know each other since their childhood years. They are both highly respected members of the Royal Guard. They both consider each other as best friends. However, as Julius had his name eaten, Reinhard no longer remembers Julius.

Emilia
Reinhard holds great admiration and respect for Emilia. In Arc 1 Epilogue, after the fight with Elsa, he bowed down to her and acknowledged that she was extremely magnanimous. According to Reinhard he believes Emilia to be the "chosen one", although it isn't made clear what Reinhard was referring to.