Nanako is a main character in the anime. Her childhood was marked by the separation of her family, which left her with a deep sense of loneliness and longing. This early experience shaped her into a self-sufficient and reserved person who learned not to rely too heavily on others. She lives with her father. In terms of appearance, Nanako has purple hair and purple eyes. She is often seen wearing a black witch-like hat and a matching cloak even when not in her magical form, and she typically dresses in a white dress with black loafers.

Personality wise, Nanako is generally quiet and introverted, with a somewhat monotone demeanor that can make her seem distant. However, this changes notably when she acts as a translator for the small alien known as the Pleiadian, adopting a more animated and expressive tone. Beneath her reserved exterior, she is a sweet and caring person who genuinely worries about the well-being of her teammates. She is also deeply passionate about stargazing and astronomy, an interest that ties into her role in the story.

Her motivations stem from her solitary upbringing. When the magical girls need someone to undertake a three-month journey to collect engine fragments, Nanako volunteers because she is already accustomed to being alone. She joins the team as the heroine of the story, helping to gather the scattered pieces of the Pleiadian’s spaceship engine so that the alien can return home. Her role within the group includes not only magical combat but also serving as the Pleiadian’s interpreter, a skill unique to her.

Key relationships include her father, with whom she lives, and her fellow magical girl teammates, to whom she grows increasingly close over the course of the series. Her bond with the Pleiadian is especially important, as she is the only one who can understand and communicate with it, bridging the gap between the alien and the rest of the team.

Through her journey as a magical girl, Nanako undergoes personal growth. She starts as a quiet, lonely girl and gradually becomes more confident and courageous, learning the value of teamwork and friendship. This development is central to her character arc.

Notable abilities include her magical transformation, which grants her an aura shaped like the Pleiades star cluster, emphasizing her love for astronomy. She rides a magical broomstick to chase down engine fragments across the cosmos and can use magic in battle. Additionally, her ability to translate the language of the Pleiadian makes her indispensable to the group’s mission.