Natsuki Subaru/Relationships

Emilia
Subaru falls in love with her at first glance. He devoted himself to protecting her no matter what happens to him, even if that meant having to repeatedly go back in time by dying. Initially she does not understand the meaning of his playful flirting with her, but gradually she nevertheless develops reciprocal feelings for him and even becomes jealous if she sees his "interest" in other girls. Their relationship is one of the main themes of the series and, in fact, the main reason for Subaru's development as an individual, because thanks to her, he gradually gets rid of his impulsive personality and learns to be more reliable, judicious and useful person than he was at the beginning of the novel. Later Subaru officially becomes her Knight which symbolizes the strong bond of trust she has developed towards him.

Rem
In their initial meeting Rem and Subaru had a neutral if not positive relationship However, due to the scent of the witch Rem in truth distrusted Subaru and wanted nothing more than his death. After witnessing his true character and seeing how far he went to protect the children in the town and her from the Wolgrams, Rem eventually comes to fall for Subaru and ends up, devoting herself wholly to him. Rem's relationship with Subaru only increases after this, she can be seen supporting and comforting him on multiple occasions, helping to persuade Emilia when he asks to join her in the selection, comforting him when he believes he's a liability, defending him when he's being accused of being a part of the witch cult. and staying with him when he's left in a shocked state after experiencing several revivals. Subaru deeply cares for Rem, this can be seen when he willingly committed suicide to stop the curse from killing her and exclaiming his love for both her and Rem prior. Subaru was also very supportive of her and often complemented her on her appearance and her smile. He comforted her when she was feeling in debt to her sister and motivated her when she stated she was nothing but a replacement. Subaru's relationship with her only increases after he witnesses her self-sacrifice and selflessness after she singlehandedly challenges the witch cult to save him and intercepting the white-whale to buy time for him to escape. Subaru was livid after witnessing Betelegeus torture Rem and shouted his intent to murder him on the spot. Subaru and Rem both rely on each other and promise to always laugh together stating there both demonically possessed. Rem confesses Subaru is the ideal hero in her eyes and that she'll do anything for him. Although Subaru has already declared his love for Emilia, Subaru reciprocates Rem's feelings to an extent as seen when he offers her the chance to leave the country with him to build a better life and jokingly admitting if Emilia agrees, he will make her his second wife. Subaru was heartbroken to discover that Rem had fallen into a coma and that not even his Return by Death could save her. However, he presses forward knowing that would have been what Rem wanted him to do and in hopes that he can one day free Rem from her slumber.

Ram
Ram and Subaru initially had a very neutral and somewhat positive relationship, Subaru immediately takes a liking to both of the maids, and after being hired by Roswall, they both teach him about their daily duties. Ram nicknames Subaru, borasu, and teaches him how to cook, clean, read and contribute to the work in the house. Ram would mockingly tell Saboru about how Rem takes care of her in every way while Subaru would tell Ram she should contribute more and not leave everything to her sister. Ram believes that Suboru has a secret affection for her and her sister as she mentions how he violated her post waking up and how he was probably interested in seeing her nude after he took his bath, which Subaru immediately denies. When Roswall mentions the possibility of Suboru to be a spy, Ram admits the likelihood of that being very slim, showing she trusts Sabaru to an extent despite only knowing him for five days. After Rem's death Saboru and Ram's relationship falls apart, Ram wounds Subaru and declares her promise to kill him, Subaru exclaims his love for her and Rem and how he's going to save them moments before jumping off a cliff to revive again. Subaru has no problem mentioning how thankful he is to both Ram and Rem as they both taught him skills he'll need to progress in the future, after being killed by Rem he was horrified by the both of the both, however he still cares for them evident by him willingly committing suicide just too save Rem's life. Ram deeply appreciated his sacrifice when he bought time for them to escape after being attacked by the Wolgram and had no ill will to him after the rescue. Ram would often trust Subaru's intuition even if the likelihood of the scenario had no basis. Ram isn't above complementing Suboru if she believes he's done a good job, evident as when she told Roswall she believed him to be quick-witted when needed. Although they both hardly mention it, they both care very much for each-others wellbeing and there both good friends.

Felt
Subaru met Felt in the first loop when some thugs assaulted him but Felt didn't help. Later on, she was about to get killed by an assassin but got saved by Subaru. From there they both established a friendship. Sometime later, when they met again in the capital, Felt showed that she was still making fun of him. Despite the confidence they both have, Felt doesn't like to approach him.

Reinhard van Astrea
Subaru sees Reinhard as a reliable friend, even bragging to the Witch of Sins that he personally knows the current Sword Saint.

Satella
Satella brought Subaru to Lugnica and said she loves him very much. After Subaru met Satella for the first time, she asked him to kill her but he said he will save her instead of killing her.

Pack
Subaru has a positive friendship with Pack, likely stemming from the boy's friendship with Emilia. However, in a loop where Subaru accidentally killed Emilia by telling her about Return by Death, Pack angrily froze him to death for breaking his promise with Emilia, returning to the mansion against her wishes, and being the one that killed her.

Beatrice
Subaru and Beatrice initially had a antagonistic relationship. Subaru's personality often annoyed Beatrice, leading her to always mock and insult him. Subaru however begins to rely on Beatrice for knowledge and advice and exclaims about how close they are. While Beatrice's actions imply the friendship is one-sided, she does to an extent care for Subaru as she cured him from his curse and foretold him about his death and how he could avoid it. She willingly made the contract to protect him from any potential threats to his life and defended him from Ram's and Roswall's attacks post Rem's death. She even went as far as to threaten Ram explaining she wouldn't hold back if she truly sought Subaru's death, providing evidence that she takes their promise very seriously and will do anything to secure his safety. After she became his Artificial Spirit, she became less cruel and started to understand Subaru's feelings.

Crusch Karsten
Subaru has fostered a good alliance with Crusch after the success of killing the Hakugei, with Crusch even giving most of the credit of the victory to him. After her memories got eaten by Ley Batenkaitos their relationship became somewhat neutral. However, after the events in Arc 5 at Priestella, they regained their friendship after Subaru accidentally saved her by taking in the part of the Dragon Vein that Capella used to poisoned her.

Anastasia Hoshin
Subaru and Anastasia's relationship is somewhat complicated. In one loop where Subaru accidentally told information about Crusch's Camp she abandoned him after revealing that she was actually using him. Despite this, Subaru still saw her as a key potential ally alongside Crusch during the campaign to subjugate the Hakugei. Currently their relationship hasn't improved, because Anastasia is currently possessed by Echidna.

Julius Juukulius
Subaru and Julius started with a bad relation when Subaru forgot his place. While both have apologized to each other after the battle with the Hakugei, Subaru told him he still hated him, with Julius stating that he didn't think they could be friends. After Julius' name got eaten by Roy Alphard, their relationship has gotten somewhat better and became close friends with both liking each other during their trip to the Pleiades Watchtower.

Ricardo Welkin
Subaru first thought of Ricardo that he was an annoying guy that would give him a headache. On their way to the Flugel Tree to fight the White Whale, Subaru realized that Ricardo and the members of the Fang of Iron are riding large wolves called Ligers. He asked him a question about a large beast man riding a large wolf makes it a bit awkward. Ricardo didn't mind it, however, he warns him not to ask that question to the others as he considers that question offensive. After they end the conversation on the Lifaus Highway, Subaru realized that Ricardo was looking out for him, calming his nerves before the battle. Subaru's first impression of Ricardo has changed since then. During the fight against the White Whale, he saved Subaru by taking the hit, sustaining major injuries in the process. In exchange, he gives Subaru a message that the whale is "lighter". This gives Subaru a fighting chance.

Echidna
Echidna is greatly interested in Subaru's Return by Death ability, as it allows him to collect information from multiple points in time. To that end, she invited him to her tea party so in order to strike a conversation with him and later offered Subaru her assistance in the form of a contract. However, Subaru rejected the offer after the other witches gave hints that Echidna wasn't telling the full truth, noticing that she is actually using him.

Meili Portroute
After the death of Elsa Granhiert, Meli was captured and was overseen under the Roswaal manor. Subaru forgave her and gives her a panda to convinced her to help him from now on.

Garfiel Tinsel
Subaru helped Garfiel to understand the truth about his mother and became good friends with him. Despite his fights in the past, Subaru was still willing to talk to him.

Roswaal L Mathers
Subaru was originally impressed by Roswaal, admiring him as the head of the Roswaal mansion and Emilia's primary benefactor despite the wizard's eccentric behavior. After the event of Arc 4, he realized that Roswaal is actually an egoistic and cruel person dedicated solely to reviving his master. Among Subaru's allies, he is the first to figure out that Subaru is looping through some method. After Subaru defeated Roswaal in their challenge, Roswaal has agreed to help him, but has also threatened to force Subaru into undergoing another loop if he makes a mistake.

Ley Batenkaitos
Even though Subaru doesn't know Ley that well, he feels immense anger for him for placing Rem in a coma and stated that he will avenge her.