Nae Tennouji is the only daughter of Yuugo Tennouji and Tsuzuri Imamiya. Initially portrayed as timid and reserved, she lives in fear of Rintaro Okabe's "Hououin Kyouma" persona, frequently labeling him a weirdo over his nickname habit; she especially resents Okabe calling her father "Mister Braun." Nae maintains close bonds with Mayuri Shiina and Suzuha Amane, viewing them as older sisters. She exchanges the "Tutturu" greeting with Mayuri and spends time with Suzuha at the CRT TV store where Suzuha works. Deeply devoted to her father, Nae often feels she burdens him, prompting her to learn cooking from Mayuri and Kurisu Makise to support him. Her life fractures following Yuugo's suicide, plunging her into profound depression. She blames Okabe and Moeka Kiryu for her father's death, a conviction leading her to murder Moeka and gravely wound Okabe in the alpha worldline with divergence 0.523307%. In this worldline, she witnesses her father's suicide and later joins SERN's Rounders. Utilizing a time machine confiscated by SERN from the Future Gadget Lab, she makes over 2000 jumps back to 2010 seeking revenge, declaring she has nothing left in her original timeline. Nae exhibits an alternate personality known as "Sergeant Clean," characterized by strict, commanding behavior used to enforce cleaning. In this role, she assigns cutesy nicknames like calling Itaru Hashida "Mister Smileybear," mirroring her father's own cleanliness enforcement tendencies. In an unspecified worldline, Nae follows Okabe and Mayuri into the metro during a SERN attack. While attempting to hug Mayuri, she inadvertently pushes her in front of an oncoming train, causing Mayuri's death. This event traumatizes Nae, though her subsequent fate is unknown. Unlike her vengeful actions in the 0.523307% divergence, this incident appears unintentional. The anime adaptation presents a different sequence where Nae does not directly witness her father's suicide, preventing her descent into vengeance as depicted in the visual novel. Beyond these events, Nae reappears as an adult in the shared Science Adventure universe within "Robotics;Notes," working as a 20-year-old employee at JAXA.