STU48's Kenkyuusei (Research Students (研究生)). They currently have 23 kenkyuuseis.
- Ikeda Yura (いけだちゃん Ikedachan) - 2nd Generation
- Imaizumi Miria (みりたん Miritan) - 2nd Generation
- Utsumi Rine (りねたん Rinetan, りーぽん Ripon) - 2nd Generation
- Osaki Serika (ぱせり Paseri) - 2nd Generation
- Kawamata Anna (あんちゃん Anchan, あんな Anna)- 2nd Generation
- Kawamata Yuuna (ゆな Yuna, ゆうた Yutama, ゆなゆな Yunayuna) - 2nd Generation
- Kudou Riko (りこち Rikochi) - 2nd Generation
- Kojima Aiko (あいちゃん Aichan, あいこじAikoji, あいちゅん Aichiyun) - 2nd Generation
- Sako Himeka (ひめたん Himetan) - 2nd Generation
- Shimizu Sara (さらちゃん Sarachan) - 2nd Generation
- Suzuki Ayaka (あやパン Ayapan) - 2nd Generation
- Takao Sayaka (さーやん Saayan) - 2nd Generation
- Taguchi Reika (れいかちゃん Reikachan, れかちゃん Rekachan) - 2nd Generation
- Tanaka Miho (みぽ Mipo, みほりん Mihorin, かみほ Kamiho) - 2nd Generation
- Tamura Natsuki (たむ Tamu) - 2nd Generation
- Nakahiro Yayoi (やよちゃん Yayochan) - 2nd Generation
- Harada Sayaka (さやかりん Sayakarin) - 2nd Generation
- Minami Yurina (ゆりにゃ Yurinya) - 2nd Generation
- Muneyuki Rika (りか Rika, ゆきりか Yukirika) - 2nd Generation
- Yoshizaki Rinko (凛子ちゃん Rinkochan, よしりん Yoshirin) - 2nd Generation
- Yoshida Sara (さら Sara) - 2nd Generation
- Rissen Momoka (ももちゃん Momochan) - 2nd Generation
- Watanabe Natsuki (なっちゃん Natchan) - 2nd Generation
- Oki Yuka - 3rd Generation Draftee (沖ちゃん Oki-chan) (STU)
- Shinano Soraha - 3rd Generation Draftee (そらは Soraha) (STU)
- Nakamura Mai - 3rd Generation Draftee (舞Q MaiQ) (STU)
- Mizoguchi Aiko - 3rd Generation Draftee (2019)
- Yura Akari (ゆらりん Yurarin) - 3rd Generation Draftee (2019)
- Maemura Himea - 2nd Generation (2019)
- Kondo Arisu (ありす Alice, ありてぃー Aritii) - 2nd Generation (2020)
STU48 Kenkyuusei Songs on STU48 Albums & Singles
- Yagate Nanohana ga Saku Koro (3rd Generation Draftee)
- Bokura no Shunkashuutou from Mubou na Yume wa Sameru Koto ga Nai (2nd Generation)
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