Piko is a male Japanese pop singer signed to the Sony Music Entertainment sub-label Ki/oon Music. He became popular on the Internet through the video sharing network Nico Nico Douga. His fans call him "Ryouseirui", a fan-made word to describe his wide vocal range that includes notes typical of both male and female voice types.
His kaomoji is "ﾋﾟωﾟｺ". As a Vocaloid producer, he uses the name Chuutoro-P.