Rona is Raji's only sister. Raji sometimes will get caught in Rona's schemes, but he usually tries to be her big brother.
Eugena is Raji's only brother. Raji will act like a big brother when he is with Eugena, although Raji's personality might interfere.
King Shenazard is the king of Tanbarun. Raji respects his father a lot since Raji will become king so the king does expect a lot from him.
His royal advisor who seems to want Shirayuki to stay with Prince Raj at Tanbarun.
Shirayuki is Raji's first friend and she has a royal title given by Tanbarun, the name was made up by Raji on the fly to save her from a kidnapping situation, as "Friend of the Crown" which is convenient since the privilege of the title is to leave and enter Tanbarun as she pleases since it's her home country. Their relationship started off rocky as Raji only wanted Shirayuki for her "unusual and rare" red hair and wanted to make her his concubine. Which was the cause of Shirayuki leaving her home country and cutting off her hair, but after giving him a second chance and as they conversed more when Shirayuki accepted his invitation to visit they have a much better relationship. Especially with Raji giving a helping hand in the kidnapping case and Shirayuki slowly changed him for the better, Raji is determined to become a better prince and take his position more seriously. Currently they have a friendly relationship.
In the beginning, Raji meets Zen face to face after Raji accidentally poisoned Zen instead of Shirayuki. Raji feared Zen after he told Raji to stay away from Shirayuki and to never speak her name out loud or else. However, as Shirayuki became friends with Raji, so did Zen. When Shirayuki went missing Raji and Zen teamed up to find her. Zen is good friends with Raji although sometimes they may have different opinions.
Raji doesn't seem jealous of Shirayuki's relationship with Zen, and supports their relationship.