Nene Todoroki is a student at Osai Academy and a member of the Robot Research Club. She has short brown hair and brown eyes, and her primary interest lies in building mechanical devices, ranging from complex robots to vibrating personal items. Her technical skill allows her to create functional inventions, some of which she carries with her during the school day. Nene’s personality is characterized by a carefree and openly perverse nature, frequently making lewd remarks and engaging in behavior that pushes the boundaries of decency. She aligns with the more uninhibited members of the student body, often serving as a source of sexual innuendo and boke-style commentary in conversations. Her motivations center on her enjoyment of inventing and her lack of inhibition, rather than any personal ambition or growth.

Within the story, Nene functions as a supporting character who appears primarily alongside the student council members. She is a friend of Suzu Hagimura and interacts regularly with vice president Takatoshi Tsuda, who often finds himself on the receiving end of her antics. While she does not undergo significant character development over the course of the series, her consistent behavior helps maintain the series’ comedic tone. Her unique expertise in robotics and her willingness to apply it to risqué projects make her a recurring contributor to the school’s chaotic atmosphere. Her most notable ability is her aptitude for building practical and often inappropriate gadgets, which she uses both for personal amusement and to unsettle those around her.