Kosuzu Sakurazaki, also known by the alias Tanpopo, is a preteen alien girl who works for an intergalactic toy company called Toys of the World. She is sent to Earth with the mission of testing an experimental power suit developed by the Galaxy Federation Police for peacekeeping purposes. To carry out this assignment, she recruits the unemployed college student Suzuo Sakurazaki, providing him with the belt that transforms him into the superhero Dokkoida. On Earth, she assumes the cover identity of Suzuo’s little sister and lives with him in the Cosmos House apartment complex. In this role, she takes responsibility for the household, including cooking meals, which she prepares using imported alien ingredients that initially take Suzuo time to adjust to. Tanpopo is portrayed as competent and resourceful for her apparent age, calmly managing the logistics of her mission and maintaining her disguise among the other tenants. Her primary motivation is the successful evaluation of the power suit, which she undertakes with a sense of duty to her organization. She acts as Suzuo’s direct supervisor, guiding him in his superhero duties while keeping the true nature of their work concealed. Her key relationship is with Suzuo, whom she supports both as a handler and as a familial presence in their shared living situation. While her character does not undergo extensive development, she demonstrates adaptability and a pragmatic approach to the challenges of living on Earth. Her notable abilities include access to advanced extraterrestrial technology and the resourcefulness to carry out her mission while blending in with human society.