Renji Daidaiiro

Renji is the male best friend of Keiti and Kyoko and who is supposed to be the Orange Rainbow Prince. He currently serves as a knight in the Rainbow Knight Force.

Trivia

 * Renji was not originally supposed to exist; he was added to the cast because the creator felt like the series could use another male character, she wanted to be able to demonstrate the concept of Rainbow Princes and the Rainbow Knight Force, and, perhaps the most random reason of all, she remembered the friend group of Takara Yumi, Amai Tenshi, and Seji Aka from the MMD series "Sadistic Passion".
 * Originally, Renji's place was, for the most part, taken by Eimi.