Rosa「ロザ」is a Bijousha from Skyriver, who possesses the power of the pink rainbow in the Guardian Angels Of The Sky series. Rosa made her first debut in Guardian Angels Of The Stars, the second season of the series.
Rosa is the keeper of the pink rainbow, who lives inside one of the Heart Brilliants, which belongs to Momozaki Rikka. Rosa is a lovely dovely Bijousha, who has a special friendship with her Bijousha friend Ione. Both appear to have spent their days together even before they became Bijoushas. Rosa is quite clumsy, yet pretty cheerful. Ione would sometimes call her stupid for her actions, which are never meant to harm anyone though.
- Momozaki Rikka: Rikka is Rosa's partner, whom she lend the powers of love.
- Ione: Ione and Rosa have been friends since their childhood and even became guardians of the rainbow together. They usually do everything together and have a hard time getting used to being separated.
- The word Rosa means "pink" in many languages.
- Rosa's appearance resembles a bunny.