Sora Tenkuji fights alien Censor Bugs as the youngest member and a junior high student in the Saitama Branch of the Earth Defense Force, born on September 20th. She possesses short silver hair often in pigtails, green eyes, and a petite frame measuring B86, W52, H78 centimeters.

Sora displays a calm, kuudere personality, appearing emotionally reserved. She lacks typical social boundaries, sometimes sleepwalking into teammate Retto Enjo's bed unknowingly. Her primary passion is drawing erotic manga and fan art, favoring fictional worlds over reality. Initially embarrassed, she gained confidence after teammates, especially Kirara Hoshino, accepted her interests. Energetic and creative, she channels this into designing the team's specialized "XERO Suits".

Previously lacking close friendships, her bond solidified when classmate Hiiro Enjo became her first friend after exchanging contact information. Discovering Hiiro is Retto's biological sister further strengthened their connection. Sora views Retto as an older brother figure, exhibiting clingy behavior like seeking to sleep in his bed for comfort. She pragmatically recruits teammates as nude models for her art, including groping Kirara's breasts for anatomical study.

Her HXEROS device, shaped like a pendant, uniquely transforms H-Energy into functional wings for flight. In combat, she emits laser beams from these wings using signature attacks "Heavenly Flash" and "Heavenly Moonlight". Her H-Energy capacity measures 62.5 megajoules, ranking third highest in the Saitama team, primarily fueled by her enthusiasm for manga and art.

Trivia includes her nickname "Sorara" given by the Censor Bug Chacha, her second-place finish in a popularity poll with 6,717 votes, a noted physical resemblance to Kirin Toudou from *The Asterisk War*, a smartphone screensaver featuring the character Myuu from "Myuu and I", and her mission code name "Exeblue".