Leo Akaba/Relationship

Reiji Akaba
It is currently unkown how Reo felt for his son but Reiji is shown to have a deep hatred and a unkown grudge to Reo and belives that Reo doesnt value him that much he is also shown display a great hatred for his fathers abmition due to the suffering they have cost.

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 how Yūri will handle the situation very well and is confident in his skills and Yūri in return is very loyal to Reo and will obey and do whatever Reo orderd him and wil follow his instruction without any question.

Serena
Serena is shown to be annoyed that Reo doesnt let her go fight the war with the Xyz Dimension and forcing her to stay. Reo is shown to be interested in Serena's unkown ability and Serena is trying to prove how worth she is towards Reo so that reo 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 ask 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.