Seishiro Nagi, the effortlessly talented and laid-back prodigy in Blue Lock, is voiced by Nobunaga Shimazaki in the original Japanese version, with Bryson Baugus providing his voice in the English dub. Shimazaki’s relaxed, almost detached delivery perfectly captures Nagi’s natural genius and unmotivated demeanor.
Nobunaga Shimazaki — The Japanese Voice of Seishiro Nagi

Date of Birth
December 6, 1988
About Nobunaga
Nobunaga Shimazaki is a highly respected Japanese voice actor known for his smooth, gentle vocal tone and ability to portray both soft-spoken and emotionally layered characters. As Seishiro Nagi in Blue Lock, Shimazaki delivers a nuanced performance that reflects Nagi’s boredom, curiosity, and gradual awakening to the thrill of competition.
His understated style allows subtle emotional shifts to shine—especially as Nagi evolves from a passive participant into a more engaged and ambitious player.
Shimazaki is widely recognized in the anime industry for his versatility, often taking on both quiet protagonists and energetic leads with equal skill.
Hometown
Miyagi Prefecture, Japan
Career Highlights
- Seishiro Nagi — Blue Lock
- Haruka Nanase — Free!
- Yuki Soma — Fruits Basket (2019)
- Eugeo — Sword Art Online: Alicization
- Mahito — Jujutsu Kaisen
His role as Yuki Soma in Fruits Basket earned widespread praise for its emotional sensitivity, while his portrayal of Mahito showcased his range in darker, more chaotic roles.
Full Current Filmography
Below is a structured list of documented roles from available sources (not exhaustive):
Anime (TV & Film)
- Blue Lock — Seishiro Nagi
- Free! — Haruka Nanase
- Fruits Basket (2019) — Yuki Soma
- Sword Art Online: Alicization — Eugeo
- Jujutsu Kaisen — Mahito
- Date A Live — Shido Itsuka
- Horimiya — Yuki Yoshikawa (supporting)
Video Games
- Granblue Fantasy — Sandalphon
- Fate/Grand Order — Arjuna
Note: This list reflects widely documented roles from cited sources and may not include his complete body of work.
Critical Reception
Nobunaga Shimazaki’s performance as Seishiro Nagi has been praised for its subtlety and authenticity. Fans often highlight how naturally he conveys Nagi’s disinterest and quiet brilliance without overacting. As the character develops, Shimazaki gradually introduces more emotional energy into the role, mirroring Nagi’s growing passion for soccer.
His broader career is consistently recognized for emotional nuance and versatility, making him a standout performer in both leading and supporting roles.
Our Sources
- Anime News Network – Nobunaga Shimazaki profile (https://www.animenewsnetwork.com/encyclopedia/people.php?id=109941)
- Behind The Voice Actors – Seishiro Nagi (https://www.behindthevoiceactors.com/characters/Blue-Lock/Seishiro-Nagi/)
- Official Blue Lock anime website and credits (https://bluelock-pr.com/)

