Jouju was appointed as the Goddess of the Corona Borealis by Lady Astria, the High Priestess of the celestial realm. However, Jouju, who valued her beloved family and friends more than the life of a goddess, chose to remain in the human world. She is a self-centered character who likes to step forward everywhere and acts out of self-importance, but she is an icon of positivity—an honest and cute girl who spreads happy energy wherever she goes. Though her desires and reality often clash, she is active as a righteous Star Goddess, helping people and protecting world peace alongside her friends.

Jouju's childhood friend and a popular guitarist attending a music school. She started a band through Jouju and Stella, and now they are so famous in Sunshineville that there is no one who doesn't know them. She is a proactive woman of action with a cool and cheerful personality, and her great empathy allows her to get along well with those around her. Not only is she musically talented, but she also has excellent athletic nerves, excelling in tennis, which she recently started.

A girl who wants to become a musical actress with her talent for ballet and passion for acting. She is in charge of the keyboard in the band with Jouju and Cindy, and the three have become inseparable friends. Stella has learned courage and self-confidence from her friends in addition to her efforts toward her dreams. She is kind, considerate, and thoughtful, making her quietly popular.

A mysterious girl like an ice fairy who descended from the sky riding on a music slide staff while playing the Secret Violin. She exudes an air of nobility and intellectual haughtiness that is extraordinary, but in reality, she has nothing and is staying at Jouju's house while working a part-time job. Because she always makes logical and calm judgments with her smart brain, she may seem cold on the outside, but she is warmer than anyone else on the inside. She and Irene were best friends before Irene became the Great Witch.

A treasure hunter hired by the Great Witch to steal the star gems, the Jubiju. She exercises magical abilities through a witch's staff received from the Great Witch and opposes Jouju's group to gather the scattered Jubiju. She has an arrogant personality and flares up instantly if she hears something she doesn't like, but like a goldfish, she forgets quickly and her mood lightens easily.

Due to various incidents, Irene developed scars and an obsession with strong power, gradually becoming stained by darkness and eventually becoming the Great Witch. Failing to get what she wanted, her resentment toward the world grew, leading her to use magical power in the wrong direction. However, if she joins hands with Jouju's group, she returns to her original form. Before she became the Great Witch, she and Rosa were the closest of friends.

A being who travels with Jouju and connects the Star Goddesses with the human world. He provides Jouju with information and missions from the magical world. He also warns her when danger arises. He helps and advises Jouju so she can use her powers. He jokes around sometimes, but he is serious at crucial moments.