Reinhard van Astrea/Relationships

Felt
After the events of Arc 1, Reinhard took it upon himself to make Felt the 42nd King of the Dragon Kingdom of Lugunica. 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.

Rom
Due to both Rom and Reinhard being overly protective of Felt and deeply caring for her, the two ended up forging a rather nice and friendly bond. According to the author, they mostly talk about different ways to raise Felt properly.

Rachins Hoffman aka Chin
Following the events of Felt-chan Gathers Thugs side story, Rachins, Gaston and Camberley joined Felt in her endeavours to win the Royal Selections. Reinhard was tasked with physically training the trio, successfully being able to develop their individual strengths. Rachins had potential with Fire Magic, hence Reinhard primarily focused on that aspect. Though nowhere near as powerful as even moderately strong Fire Magic users, Rachins is able to cast basic fireballs thanks to Reinhard's help.

Furthermore, Reinhard and Rachins often engage in somewhat hostile banter, with Reinhard usually being on the receiving end of insults, and being blamed for most problems that arise in day-to-day life–primarily due to his gallantry and perfection in every and all aspects of life. Despite such rough treatment, however, Reinhard considers Rachins a valuable ally, and someone who's more than able to protect Felt if he himself isn't around.

Heinkel Astrea
Reinhard and Heinkel used to share a very close and intimate bond, even more so due to Louanna's mysterious illness which had struck her when Reinhard was just two years old. For the next three years, Reinhard and Heinkel were inseparable, with Reinhard viewing his father as a hero, and doing everything in his power to help him or make him feel better. One time, he even received a Divine Protection, just so he could help out his father in a matter (click here for more info). At age five, however, Reinhard received the Divine Protection of the Sword Saint, which was the main catalyst for his relationship with his father spiralling into darkness.

On the day when Reinhard received the aforementioned Divine Protection, his grandmother and Heinkel's mother–Theresia van Astrea–perished at the hand of the Witch, prompting Wilhelm–and soon after, Heinkel–to gradually start blaming Reinhard for Theresia's death. Due to all the losses he was forced to go through, as well as detesting Reinhard's perfection at everything, Heinkel resorted to heavy drinking, which further ruined his relationship with his son. After Reinhard joined the Royal Guard, Heinkel even went as far as using his son's title as the Sword Saint to retain his position as Vice Captain of the Royal Guard. Perhaps one of the more vile acts Heinkel has committed occured during Arc 5–when the Witch Cult attacked the Water Gate City of Priestella, Heinkel kidnapped Felt and forced Reinhard to stay by his side and protect him. By doing that, he effectively caused irreparable damage which could have been avoided if Reinhard had been able to act sooner.

After the downfall of Greed, Heinkel and Reinhard–alongside Wilhelm–had the chance to face off against the reanimated corpse of their relative who died 15 years prior–Theresia. However, as Reinhard had no choice but to dispose of Theresia's corpse, Heinkel swore to enact revenge on the boy for shattering their family even more, vowing to ruin his son's reputation once and for all.

Louanna Astrea
As Reinhard was only two years old when his mother, Louanna, fell into a coma, it is unknown what kind of relationship the two used to share. However, he does continue to take care of her in the absence of his father and Wilhelm.

Theresia van Astrea
Theresia was possibly the closest relative Reinhard ever had. He worried about her greatly and became despondent when he learned of her death, going as far as claiming responsibility for her demise, likely due to the blame he had received from his grieving family members. Many years in the future, after the Witch Cult resurrected her, Reinhard was forced to face her and cut her down in order to save Heinkel and Wilhelm. Despite lifting his sword against his beloved grandmother, however, Reinhard showed neither emotion nor remorse, as he did not consider her reanimated corpse to be anything more than a walking hunk of flesh. This decision sadly backfired on Reinhard, as neither Heinkel nor Wilhelm took Theresia's second demise lightly, completely shattering their already strained relationship.

Wilhelm van Astrea
Wilhelm's relationship with his grandson is very tense, likely because Reinhard inherited his wife's Divine Protection of the Sword Saint, just before she died.

Nevertheless, Wilhelm did want to fix their relationship after the Hakugei was successfully killed. He professed guilt to Subaru over unfairly blaming Reinhard for Theresia’s death. However, his worry over how Reinhard may think of him made him incapable of doing so, only adding to his shame due to being unable to communicate with his grandson.

After receiving encouragement from Subaru, Wilhelm finally took the first step towards making amends with his grandson. However, their conversation was cut short by Heinkel, who intervened due his belief that none of the Astrea family members deserve forgiveness.

After Reinhard was forced to kill Theresia's resurrected corpse, Wilhelm asked his grandson if he had any regret in doing so. After hearing Reinhard's answer, he began calling the current Sword Saint by his full name and an honorary title, showing that from that point onwards, he sees him as nothing more than an acquaintance who he does not consider as his close family member.

Julius Juukulius
Having known each other for years on end, Reinhard and Julius share an incredibly close and friendly relationship, both considering each other one of their closest and best friends, alongside Ferris Argyle. The two first met when Reinhard was around eight years old, though he himself has been stated to remember his first interraction with Julius taking place when he was around fifteen years old. In the following years, the two have served together in the Royal Guard, and developed a close bond filled with mutual respect and admiration. Despite that, however, Julius was shown to harbour some sort of an inferiority complex towards Reinhard, as can be seen in Ex4 spin-off side story. Following the events of Arc 5 and Julius' fight with the Sin Archbishop of Gluttony, Julius had his name eaten which resulted in Reinhard no longer remembering him.

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 Hakugei 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 the Sin Archbishop of Greed, whose Authority of Greed made him immune to outside interference, rendering even Reinhard unable to harm him.

Emilia
Reinhard holds great admiration and respect for Emilia. In the Epilogue of Volume 1, 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 a "chosen one,” feeling a pressure from her that he attributes to her status and presence as a royal selection candidate.

Garfiel Tinsel
During the year following the conclusion of Arc 4 and Garfiel's initiation into the Emilia Camp, Reinhard had heard a great deal about him and his abilities, wishing he could meet the so-called Emilia's Shield. Luckily for him, not even a year later, that chance showed up in the Water Gate City of Priestella–though it didn't go as smoothly as Reinhard hoped. Immediately upon appearing before the Emilia Camp, Garfiel, who had been startled upon sensing Reinhard’s immense power, attacked him with everything he had. Reinhard effortlessly countered the attack, unknowingly and unintentionally scarring Garfiel through to the sheer gap in their strength. By the time Reinhard realized such, it was already too late.

In spite of the massive divide in their power, Reinhard still respects Garfiel, commenting that he was remarkably strong for a boy his age.