Reo-kun is one of the characters from Pop'n Music 2.

最近はクラブのＤＪもしているreo★kunは、ビートマニアにも曲を提供しているんだよ。
reo★kunのメロディーラインとセクシーなため息にまたまた女の子はメロメロ！
Reo★kun is recently the DJ of a club, and has also provided a song for Beatmania.
Girls are madly in love with the sexy melody line of Reo★kun!

Round Pop

Reo-kun reappears with slightly longer hair and no longer wears
sunglasses. His beret now has a rosette pinned onto it with blue and
white streamers. He wears a dark gray shirt and white tie under a beige
vest, and his pants are now more purple in color. This palette makes
another appearance in シュガーソングとビターステップ from Pop'n Music éclale and 朝までワンモアラブリー（onemore 90's lovery） from Pop'n Music: Usagi to Neko to Shounen no Yume.