|Relative(s)|| Unnamed Parents|
Unnamed Younger Brother
|“||No one's blaming you here.||”|
—Onodera to Yu Ishigami, Vol 9. Chapter 90, Page 10
Rei has light shoulder-length hair which is stylized in loose drills. She wears the standard girl's school uniform.
She is a fairly calm girl under normal circumstances, and is fairly open minded since she shows passing interest in Ishigami reading light novels. When involved with the Cheer Team or the culture festival committee, she becomes far more energetic.
She is a rather intelligent girl, placing within the top fifty among her class in the second semester finals.
- Onodera is the only member of the Cheer Team whose face is visible from her first appearance.
- As of the second semester finals, she is ranked 48th among the first year students.
|Third Year||Gigako • Kazeno • Mass Media Club President • Previous Student Council President • Tsubame Koyasu • Yume Atenbo|
|Second Year||Ai Hayasaka • Chika Fujiwara • Erika Kose • Go Kazamatsuri • Hayato Hongo • Kaguya Shinomiya • Karen Kino • Maki Shijo • Maki's Brother • Miyuki Shirogane • Momo Ryuju • Nagisa Kashiwagi • Saburo Toyosaki • Tsubasa|
|First Year||Kobachi Osaragi • Koromo Shiranui • Kozue Makihara • Miko Iino • Rei Onodera • Yu Ishigami|
|Unknown Year||Daiki Sato • Maki • Masaru Kobayashi • Takky • Teppei Tanaka|
|Archery Club||Kaguya Shinomiya|
|Astronomy Club||Momo Ryuju|
|Cheer Team||Kazeno • Tsubame Koyasu • Rei Onodera • Yu Ishigami|
|Mass Media Club||Mass Media Club President • Erika Kose • Karen Kino|
|Occult Research Club||Yume Atenbo|
|Tabletop Gaming Club||Kozue Makihara • Chika Fujiwara • Gigako|
|Volunteering Club||Nagisa Kashiwagi • Tsubasa • Maki Shijo|