Yūya Sakaki (manga)/Relationship

Yūshō Sakaki
Yūshō is Yūya's father. Although their interaction has not been shown much, it was clear that both loved and believed in each other like a father and son would. Not only Yūshō sent Yūya to the past to save his life, he also entrusted Yūya with a mission to find the creator of G.O.D even though Yūya didn't know much of the detail, believing that his son will succeed his last wish. Yūya, in return, was actually unwilling to left his father when World Illusion began, crying right before he was sent to the past. Trusting his father, Yūya determined to carry out the duty his father left to him, showing how much he respect and love his father.

Yūto
Yūto is one of Yūya's twin brothers. Yūya's cheerfulness and optimistic thinking sometimes clashes with Yūto's more serious disposition, especially due to the fact that Yūya's actions sometimes get them into trouble, leading Yūya to always be lectured by Yūto. When Dueling, Yūya sometimes even ignore Yūto's warning and advices due to his optimistic thinking, though most of times he listens and do as was advised to do. Yūto acts as a voice of reason for Yūya and always scolds him whenever he is doing something reckless or irresponsible and is very strict on lecturing him. When Yūya make a mistake, Yūto sometimes feels the need to correct it in his stead to the point of being stubborn. His way of scolding can even sound harsh, but he does so out of genuine concern for Yūya's well-being and safety. At certain moment, a praise from Yūya was enough to pacify his worry to a degree. Despite their differences, both nevertheless deeply cares and would look out for each other. Together with Yūri and Yūgo, Yūto will do anything to avoid making Yūya sad, even if it means erasing the past memories they have shared together.

Yūri
Yūri is one of Yūya's twin brothers. Yūya cares for Yūri, which is shown when he shows concern for Yūri's condition after receiving tripled damage impact and then defended him from Sora. Yūya though, has a disagreement with Yūri's rougher Dueling style, and Yūri in return thinks that Yūya is too soft. Yūri has shown a strong protective streaks towards Yūya. His protectiveness though, goes farther to the point he will disregard any reason and mercilessly beat up anyone who brings harm to Yūya in any way. When it comes about Yūya's safety, Yūri has no hesitation to put himself in harms' way and show clearly his anger and even uses rougher language as oppose to his usual politeness. He won't stop punishing his opponent even if Yūya himself asked him to stop. His protectiveness, however, doesn't stop Yūri from trusting Yūya's skill as a Duelist, which is shown during his Duel against Sora as he shows confidence that Yūya will win despite the damage he took. Together with Yūto and Yūgo, Yūri will do anything to avoid making Yūya sad, even if it means erasing the past memories they have shared together, and will remind either Yūgo or Yūto if he feels either of them want Yūya to remember them.

Yūgo
Yūgo is Yūya's one of Yūya's twin brothers. Both are very close with each other since their childhood. Yūya was always cheering for Yūgo whenever he was Riding Dueling, and this becomes Yūgo's main encouragement whenever he is starting to lose his confidence. Like Yūto and Yūri, Yūgo is protective of Yūya, having swore to himself that he will always protect Yūya at all cost, which becomes his main motivation to keep on fighting. Together with Yūri and Yūto, Yūgo will do anything to avoid making Yūya sad, even if it means erasing the past memories they have shared together. He even cried for Yūya when he saw a fragment of Yūya's painful memory, immediately destroying the memory so Yūya doesn't need to go through with the pain again and stated that he will never forgive the one who made Yūya suffer. Yūya's concern for Yūgo is shown during his Duel against Ren, in which Yūya sensed Yūgo is in danger and subconsciously saved him by creating a road within his mind when he fell from the road. He also followed Yūgo's instruction in riding D-Wheel without complaining and continue to train hard, fully believing his older brother who has more skill and experience in Riding Dueling.

Yuzu Hīragi
Yuzu is Yūya's manager and friend. The two has a rather unusual start; Yuzu wants Yūya to teach at her Duel school so she tricked him into signing the contract and forcefully make him to accept her as his manager, much to Yūya's own dismay. Their kind and friendly nature however, allows them to quickly get along quite well. Yūya would protect and save Yuzu when she is in danger, and Yuzu will assist Yūya in his quest regardless of the danger and shows genuine concern when he is injured. Like Yūto, Yuzu also scolds Yūya when she thinks he is being overly optimistic, but unfortunately, she usually has no choice but to go along with him.

Reiji Akaba
Due to the history between their fathers, both are quickly not on good terms with each other the moment they met. While Reiji admitted that he doesn't hold any grudge against Yūya, Reiji sees Yūya as a threat that will destroy the world due to his belief that Yūya is planning to control G.O.D's power and is determined to capture him at all cost. The fact that Yūya is the son of Yūshō whom he deemed responsible for his father's death also resulted with Reiji got offended when Yūya introduced Reiji as his friend. Yūya understand Reiji's hatred for his father, and sadly accepted the fact that they have to clash against each other, though Yūya believes the day will come when Reiji will finally understand the truth. Even after Reiji learned that Yūya's goal was to destroy G.O.D, Reiji was still reluctant to accept him as ally.