A Sanrio character who was originally created in 1970's, she appears with other My Melody-related characters in the 2005 anime Onegai My Melody and its sequels.

Her appearance is that of a sheep with pink wool. Unlike My Melo's other animal friends, she doesn't speak in human words, but by bleating instead. Despite this, she is still considered a gifted poet, a trait she shares with her human friend Miki. She can also play the keyboards skillfully.

She was originally called Hitsuji-san (Lamb-san), but was given the name Piano-chan in 2005 through a vote in the Japan-only Sanrio magazine Strawberry News.