Flat is a Supporting Character in Onegai My Melody. He is a blue mouse with yellow ears who wears an orange or pink ribbon on his tail. He is the closest among My Melody's animal friends. Whenever there's trouble, especially a curse created by Kuromi's magic, My Melody sometimes casts a spell on Flat to deal with it. There have also been hints that Flat may have a crush on My Melody; for example, blushing when she hugs him in one episode.