Height: 185 cm (6'1")

Kouji Mihama is one of the love interests in Pretty Rhythm: Rainbow Live. He often is seen playing the guitar and singing. He used to be in the musical section of Edel Rose until a certain conflict with former classmate Hiro Hayami when he stole his song. However, he still attends the school. He is dating fellow musician and Prism Star Ito Suzuno.

At the end of Pretty Rhythm Rainbow Live he forms the unit Over The Rainbow with Hiro and Kazuki, which is named after Kouji's father memento.

In King of Prism:

Genius songwriter. The songs he writes have a certain charm that sometimes is called devilish. Even then, he receives a lot of offers from abroad. Lives a busy life every day.