Itagaki was born on January 28, 2002, in Yamanashi Prefecture.[1] He began modeling when he was two years old.[2] In fifth grade, he passed the model audition for Stardust Promotion and joined the agency.[3][4]
^"ja:Zi-O Main Cast Interview: 板垣李光人" [Zi-O Main Cast Interview 5: Rihito Itagaki]. ja:Official Perfect Book 仮面ライダージオウ 公式完全読本 Celebrate the Zi-O Completion (in Japanese). December 25, 2019. pp. 24–26. ISBN 978-4-7986-2094-7.
^"ja:【Reader Store】2.5次元を中心に旬のステージを語り尽くす!" [[Reader Store] Talking about the latest stages mainly in 2.5 dimensions!] (in Japanese). Off Stage. Vol. 14. November 19, 2018. Archived November 20, 2018 at the Wayback Machine.
^"ja:スターダストプロモーション芸能1部モデルオーディション" [Stardust Promotion Entertainment Part 1 Model Audition] (in Japanese). Deview. Retrieved September 9, 2023.
^"ja:【注目の人物】「仮面ライダージオウ」超美形少年と話題の板垣李光人とは?" [Who is Rihito Itagaki, the super-beautiful boy from Kamen Rider Zi-O?] (in Japanese). Model Press. December 16, 2018. Archived September 9, 2023 at the Wayback Machine.
^"Cast" (in Japanese). Live-action Horimiya Official Website. Retrieved September 9, 2023.
^"ja:西銘駿や飯島寛騎のWebラジオが映画化!10名のキャストが登場する特報も公開(コメントあり / 写真17枚)" [Shun Nishime and Hiroki Iijima's web radio has been adaptated into a film! A special report featuring 10 cast members has also been released (with comments/17 photos)] (in Japanese). Eiga Natalie. July 27, 2020. Retrieved September 9, 2023.
^"ja:板垣李光人、なにわ男子・高橋恭平のライバル役に起用 『なのに、千輝くんが甘すぎる。』に出演「青春しながら作品を描けた」" [Rihito Itagaki will play Naniwa Danshi member Kyohei Takahashi's rival in And Yet, You Are So Sweet: "I was able to draw a work while still young"] (in Japanese). Oricon. September 29, 2022. Archived October 12, 2022 at the Wayback Machine. Retrieved September 9, 2023.
^"ja:松本まりかと柳俊太郎「神酒クリニックで乾杯を」出演、16歳の板垣李光人は32歳役(コメントあり)" [Marika Matsumoto and Shuntaro Yanagi appear in Cheers to Miki Clinic. 16-year-old Rihito Itagaki plays the role of 32-year-old man (comments available).] (in Japanese). Eiga Natalie. December 10, 2018. Retrieved September 9, 2023.
^"ja:山田裕貴主演『ここは今から倫理です。』メインビジュアル&生徒役11人発表" [Yuki Yamada plays a lead role in Koko wa Ima kara Rinri desu with 11 student roles announced] (in Japanese). Oricon. December 15, 2020. Retrieved September 9, 2023.
^"ja:吉川愛&板垣李光人W主演!「ジェンダーレス男子に愛されています。」ドラマ化" [My Androgynous Boyfriend gains drama adaptation W-starring Ai Yoshikawa and Rihito Itagaki!] (in Japanese). Cinema Today. March 1, 2023. Retrieved September 9, 2023.
^"ja:青天を衝け:大河ドラマ新キャスト発表 磯村勇斗が第14代将軍・徳川家茂 深川麻衣が和宮 西郷隆盛役は博多華丸" [Reach Beyond the Blue Sky New Taiga Drama Cast Announcement: Hayato Isomura will play the 14th Shogun Iemochi Tokugawa, Mai Fukagawa will play Kazumiya, and Saigo Takamori will be played by Hanamaru Hakata] (in Japanese). Mantan Web. January 26, 2021. Retrieved September 9, 2023.
^"ja:板垣李光人、『青天を衝け』クランクアップ写真を公開「全てにおいてSpecialな経験でした」" [Rihito Itagaki on leaked photos of Reach Beyond the Blue Sky: "It was a special experience in every way."] (in Japanese). TV Life. September 21, 2021. Retrieved September 9, 2023.
^"ja:平野紫耀の主演ドラマ "問題を抱えた生徒役" に道枝駿佑、板垣李光人ら" [Sho Hirano joins Shunsuke Michieda, Rihito Itagaki, and others in the drama A School Where Students Can Start Over] (in Japanese). Oricon. July 19, 2021. Retrieved May 29, 2024.
^"ja:内田理央、手に"アレ"握る衝撃カット ホットパンツ姿で"美脚"チラリ" [Rio Uchida, shocking cut that holds "that" in his hand, glimpse of "beautiful legs" in hot pants] (in Japanese). Oricon. July 9, 2021. Retrieved September 9, 2023.
^"ja:板垣李光人、平手友梨奈主演ドラマで"失声症"の厩務員役「表現するのが楽しみ」" [Rihito Itagaki on the role of a stable worker with "aphonia" in the drama starring Yurina Hirate: "I'm looking forward to expressing myself"] (in Japanese). Oricon. August 24, 2021. Retrieved September 9, 2023.
^"ja:芳根京子、ホラー苦手だけど「やるのは楽しい」 Eテレ『怖い絵本』に飯豊まりえ&板垣李光人も出演" [Kyoko Yoshine is not good at horror, but "doing it is fun". Marie Iitoyo and Rihito Itagaki also appear in E-TV drama Scary Picture Book] (in Japanese). TV Life. December 17, 2021. Retrieved September 9, 2023.
^"ja:板垣李光人がドラマ「シジュウカラ」で"18歳差の恋"、宮崎吐夢と池内博之も出演(コメントあり)" [Rihito Itagaki appears in the drama Shijūkara, a man with "18-year difference in love", alongside Tomu Miyazaki and Hiroyuki Ikeuchi (comments available)] (in Japanese). Eiga Natalie. November 27, 2021. Retrieved September 9, 2023.
^"ja:板垣李光人:金曜ドラマ「インビジブル」で柴咲コウの"片腕"に" [Rihito Itagaki plays Kou Shibasaki's "right-hand man" in the Friday drama Invisible] (in Japanese). Mantan Web. March 22, 2022. Retrieved September 9, 2023.
^"ja:川口春奈&目黒蓮『Silent』に夏帆、風間俊介、桜田ひより、板垣李光人出演" [Haruna Kawaguchi & Ren Meguro star in Silent alongside Kaho, Shunsuke Kazama, Hiyori Sakurada, and Rihito Itagaki] (in Japanese). MyNavi News. September 15, 2022. Retrieved September 9, 2023.
^"ja:板垣李光人『Silent』から2クール連続木10出演 忍者の諜報部員・山田役" [Rihito Itagaki appears in 2 consecutive seasons of Silent as Yamada, a ninja intelligence agent] (in Japanese). MyNavi News. January 19, 2023. Retrieved September 9, 2023.
^"ja:山田裕貴"戦国最強武将"本多忠勝役 女性に奥手のキャラクター 大河ドラマ『どうする家康』追加キャスト" [Yuki Yamada plays the role of Tadakatsu Honda, the "strongest military commander in the Sengoku period" Characters who are behind the scenes for women Additional cast of the taiga drama What Will You Do, Ieyasu?]. Oricon News. April 15, 2022. Retrieved September 9, 2023.
^"ja:一瞬で話題!「どうする家康」板垣李光人の"美少年"井伊直政が初登場" [Exclusive: What Will You Do, Ieyasu? Rihito Itagaki's "beautiful boy" Ii Naomasa debuts] (in Japanese). Cinema Today. April 22, 2023. Retrieved September 9, 2023.
^"ja:「ああ、ラブホテル」最終話に林遣都、板垣李光人、坂井真紀、岡田義徳ら出演(コメントあり)" [Kento Hayashi, Rihito Itagaki, Maki Sakai, Yoshinori Okada, among others appear in the final episode of Oh, Love Hotel (comments available)] (in Japanese). Eiga Natalie. April 11, 2023. Retrieved September 9, 2023.
^"ja:板垣李光人、なにわ男子・道枝駿佑の"右腕的存在"に 『マルス-ゼロの革命-』出演【コメント全文】" [Rihito Itagaki will appear in Mars: Zero's Revolution as "right-hand man" for Naniwa Danshi member Shunsuke Michieda (Full comment)] (in Japanese). Oricon. November 29, 2023. Retrieved May 29, 2024.