Ryūsei Ōnishi

Ryusei Onishi (大西 流星, Onishi Ryusei, born August 7, 2001) is a Japanese idol, actor, and singer. He is a member of the Japanese boy band Naniwa Danshi.

He joined Johnny & Associates as a trainee (Johnny's Jr.) in 2012, became a member of Naniwa Danshi when the group was formed in 2018, and made his CD debut with the group in 2021 with the single "Ubu Love".

Early life Onishi was born on August 7, 2001, in Hyōgo Prefecture, Japan. He joined Johnny & Associates in 2012, at the age of ten, after being inspired to pursue a career in entertainment.

Before entering the agency, he had studied dance from the age of five.

Career Shortly after joining the agency, Onishi became a member of the Kansai Johnny's Jr. unit Naniwa Oji.

In 2018, he was selected as a member of Naniwa Danshi. The group made its CD debut on November 12, 2021, with the single "Ubu Love".

In 2022, Onishi produced a collaborative cosmetics line with the brand Ettusais, reportedly becoming the first talent from his agency to do so.

As an actor, Onishi appeared in the television drama Starman: Kono Hoshi no Koi (2013), and later starred in Muchuu sa, Kimi ni. (2021) as Miyoshi Hayashi.

He went on to take leading roles in Kanojo, Okarishimasu (2022) and Benisasu Life (2023), the latter of which featured him as Masato Hojo, a university student who aspires to launch a cosmetics brand, reflecting Onishi's own interest in beauty and makeup.

In film, he appeared in Ninjani Sanjo! Mirai e no Tatakai (2014), Shonentachi (2019), The Good Father (2022), and My Happy Marriage (2023). In 2024, he played Eiji Aihara in We Don't Know Love Yet, his first starring role in a feature film.

Outside of entertainment, he served as a member of an advisory panel for Expo 2025 Osaka, Kansai.

Public image Onishi is known for his interest in beauty and cosmetics, which has been reflected in his work, including producing a cosmetics collaboration. He has also been noted for his enthusiasm for railways, particularly the Shinkansen. His interest in railways has led to collaborations with railway-related campaigns, including a promotional project with JR Central.

Filmography

Television Year Title Role Notes Ref. 2013 Starman: Kono Hoshi no Koi Dai Uno 2020 Toshishita Kareshi Takumi / Daichi Yano 2020 Seiho Boys' High School! Ten Momoi 2021 Muchuu sa, Kimi ni. Miyoshi Hayashi Lead role 2022 Rokuhodo Yotsuiro Biyori Tsubaki Nakao 2022 Rent-A-Girlfriend Kazuya Kinoshita Lead role 2023 Benisasu Life Masato Hojo Lead role

Film Year Title Role Notes Ref. 2014 Ninjani Sanjo! Mirai e no Tatakai 2019 Shonentachi 2022 The Good Father Jun Yotsui 2023 As Long as We Both Shall Live Prince Takaihito 2024 We Don't Know Love Yet Eiji Aihara Lead role 2024 Nintama Rantaro the Movie: Dokutake Ninja-tai Saikyo no Gunshi Seiemon Sakuragi Voice role

Stage Year Title Role Notes Ref. 2015 Boys: Dream of The World...Children Who Don't Know War Stage productions 2017 Boys: Snow Falls on a Southern Island Stage productions 2018 Kiki's Delivery Service Tombo 2018 Boys: Running Through Tomorrow Stage productions