# Seiichiro Yamashita (山下誠一郎)
**Seiichiro Yamashita** (山下誠一郎, Yamashita Seiichirō; born 1992) is a Japanese male voice actor affiliated with Osawa Office, known for lead roles such as Cid Kagenou/Shadow in *The Eminence in Shadow*, Naruse Sho in *orange*, and Yagen Toushiro in the *Touken Ranbu* series.[1](https://bangumi.tv/person/12143) • [2](https://jinbutsu.jp/catalog/people/yamashita-seiichiro.html)
| Key fact | Detail |
|---|---|
| Born | 1992, Fukuyama, Hiroshima Prefecture, Japan[1](https://bangumi.tv/person/12143) |
| Agency | Osawa Office (大沢事務所)[1](https://bangumi.tv/person/12143) |
| Training | Voice acting department, Amusement Media Comprehensive Academy[1](https://bangumi.tv/person/12143) |
| Debut | 2012, dubbing the foreign film *Good Doctor: The Forbidden Chart*[3](https://www.tv-ranking.com/detail/39080/profile/) |
| First lead role | Takahiro Mizuno in *Valkyrie Romance*, October 2013[3](https://www.tv-ranking.com/detail/39080/profile/) |
| Signature roles | Cid Kagenou/Shadow (*The Eminence in Shadow*), Naruse Sho (*orange*), Ishikawa Toru (*Horimiya*), Raiden Shuga (*86*), Yagen Toushiro (*Touken Ranbu*)[2](https://jinbutsu.jp/catalog/people/yamashita-seiichiro.html) |
| Game roles | Ace Trappola (*Disney Twisted-Wonderland*), Ramon Victorino (*Captain Tsubasa* games)[4](https://www.mobygames.com/person/707678/seiichiro-yamashita/) |
## Early life and training
Yamashita was born in 1992 in Fukuyama, Hiroshima Prefecture.[1](https://bangumi.tv/person/12143) He first aimed to become an actor, but living in [Hiroshima](https://www.edgepedia.org/hiroshima) meant he had no access to auditions in Tokyo; after entering high school he became deeply involved with anime and manga through friends, and decided that voice acting looked like interesting work.[3](https://www.tv-ranking.com/detail/39080/profile/) After graduating from high school he entered the voice acting department of Amusement Media Comprehensive Academy.[1](https://bangumi.tv/person/12143)
His career began not with Japanese animation but with dubbing foreign productions: in 2012, while still a student, he made his voice acting debut in the Japanese dub of the foreign film *Good Doctor: The Forbidden Chart*.[2](https://jinbutsu.jp/catalog/people/yamashita-seiichiro.html) • [3](https://www.tv-ranking.com/detail/39080/profile/) In January to March 2013 he passed a production-affiliation audition held within his school and joined Osawa Office.[1](https://bangumi.tv/person/12143)
## Anime career
**Early work.** In 2013 he took small roles in series such as *Aikatsu!*, *Arpeggio of Blue Steel -Ars Nova-*, and *A Certain Scientific Railgun S*, and in October of that year he played his first lead role, Takahiro Mizuno in *Valkyrie Romance*.[3](https://www.tv-ranking.com/detail/39080/profile/) Subsequent television credits include Soara in *Lady Jewelpet* and Kurei in *Soul Eater Not!* (2014), Koumura Gekka in *Battle Spirits Burning Soul* (2015), and Kitajou Buntarou in *The Girls in the Dark* (2016).[5](https://anime.eiga.com/person/10922/program/)
**Breakout and later roles.** His profile lists as representative work Cid Kagenou/Shadow in *The Eminence in Shadow*, Naruse Sho in *orange*, Ishikawa Toru in *Horimiya*, Raiden Shuga in *86*, and Yagen Toushiro in the *Touken Ranbu* series.[2](https://jinbutsu.jp/catalog/people/yamashita-seiichiro.html) He reprised Shadow in the second season of *The Eminence in Shadow* (2023), the crossover series *Isekai Quartet 3* (2025), and the theatrical film *The Eminence in Shadow: Echoes of Zanpei* (2027).[5](https://anime.eiga.com/person/10922/program/) Other 2023–2025 credits include Tsurucho in *Tokyo Revengers* (Tenjiku and Sanzen arcs), Leanne Scrimgeour in *The Ancient Magus' Bride* Season 2, Orslot in *Shangri-La Frontier*, Urabe Eigen in *Go! Go! Loser Ranger!* and its second season, and Lambert Balance in *Villainess Level 99 Otoko*.[5](https://anime.eiga.com/person/10922/program/) • [6](https://www.cy.netgamebm.com/creator/view/15710/)
## Game and dubbing work
MobyGames credits him on 20 games, including Ace Trappola in *Disney Twisted-Wonderland* (2020), Ramon Victorino in *Captain Tsubasa: Rise of New Champions* (2020) and *Captain Tsubasa II: World Fighters* (2026), Shadow/Cid Kagenou in *The Eminence in Shadow: Master of Garden* (2022), Yagen Toushiro in *Touken Ranbu Warriors* (2022), and Salamando, Elemental of Fire, in *[Visions of Mana](https://www.edgepedia.org/visions-of-mana)* (2024).[4](https://www.mobygames.com/person/707678/seiichiro-yamashita/) Japanese databases add roles such as Iso in *VALORANT* (2023) and Exabe Olive in *Mobile Suit Gundam GQuuuuuuX*-related titles.[7](https://coemee.com/column/seiyuu/yamashita-seiichiro/)
In the new game *[Samurai Pizza Cats: Blast from the Past!](https://www.edgepedia.org/samurai-pizza-cats-blast-from-the-past)*, produced for the 35th anniversary of *Kyatto Ninden Teyandee*, he was announced as the voice of Scassy, taking over the role from Juurota Kosugi, while other cast members from the original anime reprised their parts.[3](https://www.tv-ranking.com/detail/39080/profile/)
## Public appearances
He has appeared at industry events, including a stage for *The Girls in the Dark* at AnimeJapan 2019 alongside Kanahana, Akasaki Asami, and other cast members, and a [Tokyo Game Show](https://www.edgepedia.org/tokyo-game-show) 2017 broadcast for *FF Brave Exvius*.[8](https://www.anime-japan.jp/2019/img/index/aj2019_guidebook.pdf) • [9](https://expo.nikkeibp.co.jp/tgs/2017/pdf/press/jp/press_20170921-2_jp.pdf) Event databases list him at fan meetings and franchise stages for *Handsome Ransoming*, *PriPara*, and *The Eminence in Shadow*.[10](https://www.eventernote.com/actors/14111)
## References
1. [山下誠一郎 | Bangumi 番组计划](https://bangumi.tv/person/12143)
2. [山下誠一郎（実在の人物）とは｜JINBUTSU](https://jinbutsu.jp/catalog/people/yamashita-seiichiro.html)
3. [山下誠一郎のプロフィール](https://www.tv-ranking.com/detail/39080/profile/)
4. [Seiichiro Yamashita - MobyGames](https://www.mobygames.com/person/707678/seiichiro-yamashita/)
5. [山下 誠一郎 : 出演作品 - アニメハック](https://anime.eiga.com/person/10922/program/)
6. [山下誠一郎 - クリエイター・声優・俳優情報 - コノミー](https://www.cy.netgamebm.com/creator/view/15710/)
7. [山下誠一郎（やました せいいちろう）のプロフィール・出演作品｜coemeeメディア](https://coemee.com/column/seiyuu/yamashita-seiichiro/)
8. [ごあいさつ Greeting, AnimeJapan 2019 guidebook](https://www.anime-japan.jp/2019/img/index/aj2019_guidebook.pdf)
9. [東京ゲームショウ2017 press release](https://expo.nikkeibp.co.jp/tgs/2017/pdf/press/jp/press_20170921-2_jp.pdf)
10. [山下誠一郎のイベント・ライブ情報 - Eventernote](https://www.eventernote.com/actors/14111)
---
*Topic: Encyclopedia › Arts and culture › Screen and stage › Film and television › Screen people and creators › Voice performers › Japanese voice performers › Surnames N to Y*
*Initially written Sep 17, 2026 · Reviewed: Sep 18, 2026; Sep 30, 2026; Oct 25, 2026 · Edited: Sep 18, 2026; Sep 30, 2026; Oct 12, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license