Yūto/Relationship

Ruri Kurosaki
There has been no interaction between Yūto and Ruri thus far. However, in Episode 24, Yūto and Yuzu's conversation revealed that the first time Yūto encountered Yuzu, he mistook her for Ruri, who is currently captured by theor enemy, Academia. This displays the care and protectiveness Yūto has towards Ruri as he stated to Yuzu (at that time thinking she was Ruri) "I don't want you to get hurt anymore." His concern for Ruri's safety may be the reason why he continues to be around Yuzu. After having a flashback, Yuto remembers an event during or after Ruri's capture as well as whispering her name after the memory ended.

He is 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.

Shun Kurosaki
Shun and Yūto appear to know each other for along time. Although they disagree between their ideas, they have a lot of faith and trust in each other. Yūto refers to Shun as his best friend, protesting that the two did not 'run away' from their homeland, while Shun shows concern when Yūto fought with Yūgo when a Synchro Summon was detected. He is also shown to have to keep Shun under control like Reji (sometimes with physical force) and even had to do so after being merged with Yuya after Shun angrily accused him of stealing Yuto's duel disk and Dragon.

Yuzu Hīragi
Upon their first meeting, Yūto mistook Yuzu for Ruri Kurosaki. He began to grow protective of her but soon discovered she was not Ruri. However, despite this knowledge, Yūto still watches over her.

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, and he also sacrificed himself for Yūya from Yūgo's monster. He then entrusted Yūya with his Dark Rebellion Xyz Dragon and told him to bring Duels with smiles for everyone's' future before he was absorbed into Yuya's soul. Like Yuzu, he is shown to be protective of Yuya as shown when he selflessly saved Yuya from a dangerous attack from Yugo at the cost of receiving it himself and again when he merged with Yuya to help him defeat Isao who had cornered Yuya in his Duel.