Nene Mouri is a character from the anime Princess Nine who serves as the team manager and part-time cheerleader for the Kisaragi Girls' High baseball team. Her background is that of a wealthy and energetic teenager with a wide range of interests. She is described as a constant bundle of energy and a perpetual ditz, meaning she is often scatterbrained but cheerful. Her motivation stems from a genuine desire to support her friends and the baseball team, although she knows very little about the sport itself, learning everything she knows primarily from sports manga. This lack of practical knowledge does not diminish her enthusiasm.

In the story, her role is primarily off the field. She manages the team's equipment, organizes activities, and provides cheerleading support during games. She also occasionally steps in as a replacement coach when the official coach, Shinsaku Kido, is absent or late due to his drinking habits. While she is not a player, her upbeat presence contributes to the team's morale.

Key relationships include her close friendships with teammates Yuki Azuma and Kanako Mita, with whom she bonds over shared interests. She also has a lighthearted dynamic with Coach Kido, often tolerating his unreliable behavior. Another relationship is with Yoko Tokashiki, who dismisses Nene's potential for fashion modeling, but Kanako defends Nene's abilities in that area.

Nene's development is subtle; she remains consistently supportive and enthusiastic throughout the series, and her loyalty to her friends is a defining trait. Her notable abilities are not athletic but rather organizational and cheerleading skills, alongside a remarkable variety of hobbies such as baking, flower arrangement, Japanese dance, violin, sewing, ballet, and collecting stuffed animals. These hobbies reflect her curious and multifaceted personality. Overall, Nene Mouri is a lighthearted, devoted manager who provides emotional support and comic relief to the team.