Leo Akaba/Relationship

Reiji Akaba
It is currently unknown how Reo felt for his son, but Reiji is shown to have a deep hatred and an unknown grudge to Reo and believes that he doesn't value him that much. He is also shown to display a great hatred for his father's ambition due to the suffering he has caused.

Yūri
Yūri appears to be Reo's most trusted student. Reo is shown to trust Yūri greatly as he entrusted him to kidnap Yuzu's counterparts because he knew that Yūri will handle the situation very well and is confident in his skills. Yūri in return is very loyal to Reo and will obey and do whatever Reo orders him to do and will follow his instructions without any question.

Serena
Serena is shown to be annoyed that Reo doesn't allow her to go fight the war with the Xyz Dimension and is forcing her to stay. Reo is shown to be interested in Serena's unknown ability, while Serena is trying to prove her worth to Reo so that he can allow her to join the war. According to Serena, Reo has treated her kindly and with care.

Sora Shiun'in
Reo also appears to trust Sora like how he does towards Yūri. Unlike Yūri, however, Sora doesn't listen to Reo's orders as it is seen when Sora asks him to return to Standard. Reo permitted him to and ordered him to bring Serena back to Academia. Sora only went there to get revenge on Shun rather than focusing on his mission.