Ro-Kyu-Bu!/Trivia
- Casting Gag: The five main seiyuu actually form a group literally named Ro-Kyu-Bu. This isn't simply a mere coincidence.
- Hey, It's That Voice!
- In the first season:
- Yuuki Kaji as Subaru Hasegawa
- Kana Hanazawa as Tomoka Minato
- Yuka Iguchi as Maho Misawa
- Yoko Hikasa as Saki Nagatsuka
- Rina Hidaka as Airi Kashii
- Yui Ogura as Hinata Hakamada
- Mamiko Noto as Nayu Hasegawa
- Kanae Itou as Aoi Ogiyama
- Shizuka Itou as Mihoshi Takamura
- Minako Kotobuki as Natsuhi Takenaka
- Rina Sato as Touko Hatano
- Asami Seto as Kagetsu Hakamada
- Mariya Ise as Miyu Aida
- Satomi Satou as Manaka Nobidome
- Ayako Kawasumi as Hatsue Nobidome
- Asuka Oogame as Satsuki "Zono" Kakizono
- Ai Kayano as Tae "Shouji" Mishouji
- Chieko Kagose as Kumi Tsukada
- Naoko Sugiura as Misuzu Kuumoto
- Arisa Nishiguchi as Ran Yahagi
- Rei Mochizuki as Momoe Tachibana
- In the second season:
- Misaki Kuno as Mimi Balguerie
- Minami Tsuda as Tsubaki Takenaka
- Aya Suzaki as Hiiragi Takenaka
- Risa Taneda as Masami Fujii
- Takehito Koyasu as Ginga Hasegawa
- Ryotaro Okiayu as Shinobu Minato
- Yumi Uchiyama as Kaori Minato
- Shintaro Asanuma as Ryuichi Suga
- Asami Shimoda as Nana Yotsuya
- Yuiko Tatsumi as Mayumi Odaka and Nobue Okuda
- Haruka Yamazaki as Yume Nakano
- Ari Ozawa as Wakana Kitano
- In the first season:
- Relationship Voice Actor and nearly all of them have voiced a role in A Certain Magical Index/A Certain Scientific Railgun.
- Back to Ro-Kyu-Bu!