Ryusei Onishi

Ryusei Onishi
大西 流星
Onishi in 2023
Born (2001-08-07) August 7, 2001
Hyōgo Prefecture, Japan
Occupations
  • Idol
  • actor
  • singer
Years active2012–present
AgentStarto Entertainment
Known forMember of Naniwa Danshi
Musical career
GenresJ-pop
Label
Member of

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. [1]

Before entering the agency, he had studied dance from the age of five.[2]

Career

Shortly after joining the agency, Onishi became a member of the Kansai Johnny's Jr. unit Naniwa Oji.[3]

In 2018, he was selected as a member of Naniwa Danshi.[4] The group made its CD debut on November 12, 2021, with the single "Ubu Love".[5][6]

In 2022, Onishi produced a collaborative cosmetics line with the brand Ettusais, reportedly becoming the first talent from his agency to do so.[7]

As an actor, Onishi appeared in the television drama Starman: Kono Hoshi no Koi (2013),[8] and later starred in Muchuu sa, Kimi ni. (2021) as Miyoshi Hayashi.[9]

He went on to take leading roles in Kanojo, Okarishimasu (2022)[10] 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.[11]

In film, he appeared in Ninjani Sanjo! Mirai e no Tatakai (2014),[12] Shonentachi (2019),[13] The Good Father (2022),[14] and My Happy Marriage (2023).[15] In 2024, he played Eiji Aihara in We Don't Know Love Yet, his first starring role in a feature film.[16]

Outside of entertainment, he served as a member of an advisory panel for Expo 2025 Osaka, Kansai.[17]

Public image

Onishi is known for his interest in beauty and cosmetics, which has been reflected in his work, including producing a cosmetics collaboration.[18] He has also been noted for his enthusiasm for railways, particularly the Shinkansen.[19] His interest in railways has led to collaborations with railway-related campaigns, including a promotional project with JR Central.[20]

Filmography

Television

YearTitleRoleNotesRef.
2013Starman: Kono Hoshi no KoiDai Uno[21]
2020Toshishita KareshiTakumi / Daichi Yano[22][23]
2020Seiho Boys' High School!Ten Momoi[24]
2021Muchuu sa, Kimi ni.Miyoshi HayashiLead role[25]
2022Rokuhodo Yotsuiro BiyoriTsubaki Nakao[26]
2022Rent-A-GirlfriendKazuya KinoshitaLead role[27]
2023Benisasu LifeMasato HojoLead role[28]

Film

YearTitleRoleNotesRef.
2014Ninjani Sanjo! Mirai e no Tatakai[29]
2019Shonentachi[30]
2022The Good FatherJun Yotsui[31]
2023As Long as We Both Shall LivePrince Takaihito[32]
2024We Don't Know Love YetEiji AiharaLead role[33]
2024Nintama Rantaro the Movie: Dokutake Ninja-tai Saikyo no GunshiSeiemon SakuragiVoice role[34]

Stage

YearTitleRoleNotesRef.
2015Boys: Dream of The World...Children Who Don't Know WarStage productions[35]
2017Boys: Snow Falls on a Southern Island Stage productions[36]
2018Kiki's Delivery ServiceTombo[37]
2018Boys: Running Through TomorrowStage productions[38]

References

  1. ↑ "大西流星". oricon (in Japanese). Retrieved March 20, 2026.
  2. ↑ "なにわ男子メンバー分析第2回：大西流星　人々を夢中にさせるプロフェッショナルアイドル". realsound (in Japanese). October 17, 2021. Retrieved March 20, 2026.
  3. ↑ "10歳を大抜てき！ジャニーズ入り1カ月で異例のスピードデビュー". Sponichi. August 5, 2012. Retrieved March 20, 2026.
  4. ↑ "関西ジャニーズＪｒ．に４年ぶり新ユニット「なにわ男子」お披露目". Sponichi Annex (in Japanese). October 25, 2018.
  5. ↑ "ジャニーズＪｒ．のグループ、なにわ男子が１１月１２日にＣＤデビュー決定". SANSPO.COM (in Japanese). July 28, 2021.
  6. ↑ "【きょうデビュー】なにわ男子って？ グループ躍進の歩みを振り返る". Oricon News (in Japanese). November 12, 2021.
  7. ↑ "なにわ男子大西流星が驚き「こんなに早く叶うとは」ジャニーズタレントで初のコスメプロデュース". Nikkan Sports. November 16, 2022. Retrieved March 20, 2026.
  8. ↑ "早すぎた『ホットスポット』だった…『スターマン・この星の恋』平成の酷評から一転、令和で愛される可能性". mynavi (in Japanese). May 14, 2025. Retrieved March 21, 2026.
  9. ↑ "なにわ男子 大西流星主演で『夢中さ、きみに。』実写ドラマ化決定　監督は塚原あゆ子、脚本は喜安浩平". realsound (in Japanese). December 5, 2020. Retrieved March 21, 2026.
  10. ↑ "大西流星、『かのかり』で冴えない大学生を好演　俳優としてのキャリアを積むなにわ男子". realsound (in Japanese). July 16, 2022. Retrieved March 21, 2026.
  11. ↑ "なにわ男子、大西流星の"コスメ"エピソード披露 主演ドラマ『紅さすライフ』鑑賞会". oricon (in Japanese). July 22, 2023. Retrieved March 21, 2026.
  12. ↑ "ジャニーズＷＥＳＴ＆関ジャニＪｒ．が集結　『忍ジャニ参上！未来への戦い』舞台あいさつ". billboard-japan (in Japanese). June 9, 2014. Retrieved March 21, 2026.
  13. ↑ "映画　少年たち". eiga.com (in Japanese). 2019. Retrieved March 21, 2026.
  14. ↑ "南沙良×大西流星「この子は邪悪」本予告完成！　主題歌はゲスの極み乙女「悪夢のおまけ」". eiga.com (in Japanese). 2022. Retrieved March 21, 2026.
  15. ↑ "目黒蓮が仕える皇子は「なにわ男子」大西流星！　「わたしの幸せな結婚」追加キャスト発表＆場面写真披露". eiga.com (in Japanese). 2022. Retrieved March 21, 2026.
  16. ↑ "大西流星が齊藤なぎさを抱き寄せる、「恋僕」胸キュンシーン切り取った新写真4枚". natalie (in Japanese). August 14, 2024. Retrieved March 21, 2026.
  17. ↑ "なにわ男子・大西流星「万博を支えたい」有識者懇話会委員に就任". Daily Sports. December 22, 2019. Retrieved March 20, 2026.
  18. ↑ "なにわ男子・大西流星、セルフメイク事情＆ポーチの中身披露「MAQUIA」新連載も決定". modelpress (in Japanese). February 13, 2026. Retrieved March 20, 2026.
  19. ↑ "なにわ男子 大西流星さんインタビュー　鉄道はロマン、新幹線は僕のヒーロー！". toretabi (in Japanese). March 19, 2025. Retrieved March 20, 2026.
  20. ↑ "JR東海「大西流星×東海道新幹線 りゅちぇ旅」限定コンテンツなど". mynavi. April 23, 2025. Retrieved March 20, 2026.
  21. ↑ "広末涼子：17年ぶり主演連ドラ「スターマン」クランクアップに涙 「頼りなかった……」". mantan. July 16, 2013. Retrieved March 20, 2026.
  22. ↑ "なにわ男子・大西流星、桜井日奈子の年下彼氏役に！関西ジャニーズJr.総出演『年下彼氏』". dogatch. March 4, 2020. Archived from the original on March 19, 2020. Retrieved March 20, 2026.
  23. ↑ "年下彼氏：第5回　なにわ男子・大西流星、Aぇ！group・正門良規が恋の火花 「俺、元彼」とライバル宣言？". 毎日キレイ. MANTAN. May 8, 2020. Retrieved March 20, 2026.
  24. ↑ "なにわ男子主演「メンズ校」10月7日スタート！注目の配役も明らかに". ザテレビジョン. September 4, 2020. Retrieved March 20, 2026.
  25. ↑ "なにわ男子・大西流星、「夢中さ、きみに。」で初のドラマ単独主演「林くんを追求して頑張りたい」". 音楽ナタリー. natalie. December 5, 2020. Retrieved March 20, 2026.
  26. ↑ "小瀧望主演『鹿楓堂よついろ日和』葉山奨之&大西流星&佐伯大地&白洲迅が出演". ORICON NEWS. 株式会社oricon ME. November 28, 2021. Retrieved March 20, 2026.
  27. ↑ "なにわ男子・大西流星主演『彼女、お借りします』メインビジュアル公開　追加キャストに沢口愛華ら". crank-in (in Japanese). June 17, 2022. Retrieved March 20, 2026.
  28. ↑ "なにわ男子・大西流星が7月期シンドラで主演、コスメで起業を目指すメイク男子に". natalie. May 22, 2023. Retrieved March 20, 2026.
  29. ↑ "キャスト". 忍ジャニ参上! 未来への戦い. Shochiku. 2014. Archived from the original on July 1, 2014. Retrieved March 20, 2026.
  30. ↑ "Movie (ジャニーズJr.)「映画 少年たち」". Johnny's net. November 2018. Archived from the original on November 17, 2018. Retrieved March 20, 2026.
  31. ↑ "お母さんじゃない…南沙良主演「この子は邪悪」公開、大西流星や桜井ユキ、玉木宏も参加". natalie (in Japanese). January 17, 2022. Retrieved March 20, 2026.
  32. ↑ "なにわ男子・大西流星、目黒蓮が仕える皇子役 『わたしの幸せな結婚』追加キャストに決定". ORICON NEWS. oricon ME. November 11, 2022. Retrieved March 20, 2026.
  33. ↑ "『恋を知らない僕たちは』主演 大西流星インタビュー". screenonline (in Japanese). August 27, 2024. Retrieved March 20, 2026.
  34. ↑ "大西流星&藤原丈一郎『忍たま乱太郎』声優挑戦のキャラクタービジュアル公開 森久保祥太郎から演技指導". oricon. November 12, 2024. Retrieved March 20, 2026.
  35. ↑ "関西ジャニーズJr.総出演のミュージカル開幕". nikkansports. August 2, 2015. Retrieved March 21, 2026.
  36. ↑ "関西ジャニーズJr.の大阪松竹座公演開幕！大西流星はアキラ100%に対抗意識!?". Sports Hochi. August 2, 2017. Archived from the original on August 5, 2017. Retrieved March 21, 2026.
  37. ↑ "関西ジャニーズJr.大西流星、福本莉子の変化に「東京に染まってきたのかな」 阿部顕嵐との食事会秘話も〈魔女の宅急便〉". modelpress. June 14, 2018. Retrieved March 21, 2026.
  38. ↑ "西畑大吾ら関西ジャニーズJr.出演「明日を駆ける少年たち」が今夏松竹座で". ステージナタリー. natalie. May 29, 2018. Retrieved March 21, 2026.
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