Yūto/Relationship

Ruri Kurosaki
There has been no interaction between Yūto and Ruri thus far. However, Yūto displays care and protectiveness towards Ruri as he stated to Yuzu (at that time thinking she was Ruri) that he doesn't want her to get hurt. Also, despite not wanting to hurt anyone anymore, Yūto decides to continue to fight to save her, as shown when he accepted Sora's challenge when the latter told him that he can save Ruri by destroying the Academia. He is also shown to be very supportive and defensive of Ruri as he told Shun, after he also mistook Yuzu for his little sister, that Ruri would never learn the enemies' form of summoning with a smile on her face. This being said with full determination and belief in her. This shows that both are very close with each other.

Shun Kurosaki
Shun is Yūto's Resistance comrade. Although there are disagreement between their way on finding Ruri, they have a lot of faith and trust in each other. Yūto also refers to Shun as his best friend, protesting that the two did not run away from their homeland. He is also shown to have to keep Shun under control (sometimes with physical force) and even continue to do so after being merged with Yuya, such as when Shun angrily accused him of stealing Yuto's duel disk and Dragon. Shun also considers Yūto as his close friend, though this didn't stop him from threatening Yūto when he felt Yūto was getting in his way of saving his sister. Shun is very concerned of Yūto's well-being. This was demonstrated when he wanted to assist Yūto in fighting Yūgo, and when he angrily accused Yūya of harming and stealing Yūto's Duel Disk and Dragon since Yuya had possession of the card.

Yuzu Hīragi
Upon their first meeting, Yūto mistook Yuzu for Ruri Kurosaki. He began to grow protective of her until he discovered she was not Ruri. However, despite this knowledge, Yūto still watches over her, warning her not to get involved in their battle because he doesn't want her to get hurt and also told her that if she got involved, then he wishes for her to survive. Yuzu was initially skeptical and wary of Yūto, but eventually understand that Yūto is not a bad person, defending him when Masumi thought he was the one responsible for attacking Marco, and cleared up the misunderstanding between him and Yūgo

Yūya Sakaki
Although they've only met for a short period of time, Yūto immediately developed a trust with Yūya because they both believed the purpose of Dueling is to make people smile and have fun. Yūto truly wishes for this, which led him to sacrificed himself for Yūya from Yūgo's Dragon. He then entrusted Yūya with his Dark Rebellion Xyz Dragon and told him to bring Duels with smiles for everyone's' future. Like Yuzu, he is shown to be protective of Yuya as shown when he merged with Yuya to help him defeat Isao who had cornered Yuya in his Duel. Yūya also grows to trust Yūto, determined to fulfil their promise, which became one of Yūya's primary motivations to continue Duelling. As a result, the two formed a strong bond similar to that of brothers and have defended each other in many ways, such as Yuto defending Yuya from Shun's accusations and Yuya silencing Reiji when he was about to tell about the Xyz invasion because he knew how much it hurt Yuto and Shun.