Shinichi Izumi in Parasyte -the maxim- is voiced by Nobunaga Shimazaki in the original Japanese version and Adam Gibbs in the English dub. Shimazaki’s performance captured Shinichi’s transformation from an ordinary high school student into a psychologically hardened survivor, while Gibbs brought the same emotional intensity and gradual character evolution to the English adaptation. (behindthevoiceactors.com)

Nobunaga Shimazaki – Japanese Voice of Shinichi Izumi

Date of Birth

December 6, 1988

About Nobunaga

Nobunaga Shimazaki is a Japanese voice actor affiliated with Aoni Production. Since rising to prominence in the early 2010s, he has become known for portraying emotionally layered protagonists across action, drama, romance, and fantasy anime.

His role as Shinichi Izumi in Parasyte -the maxim- became one of the standout performances of his early career. Shinichi undergoes dramatic emotional and psychological changes throughout the series as he struggles with fear, trauma, morality, and his increasingly inhuman nature after bonding with the parasite Migi. Shimazaki’s performance was widely praised for gradually altering Shinichi’s tone and emotional delivery as the character evolved.

Fans and critics frequently highlight how subtly his voice performance changes over the course of the anime, reflecting Shinichi’s loss of innocence and emotional detachment.

Outside of Parasyte, Shimazaki is also widely recognized for major roles in Sword Art Online, Blue Lock, Free!, and Date A Live.

Hometown

Miyagi Prefecture, Japan

Career Highlights

  • Shinichi Izumi — Parasyte -the maxim-
  • Eugeo — Sword Art Online: Alicization
  • Nagi Seishiro — Blue Lock
  • Haruka Nanase — Free!
  • Yuno — Black Clover
  • Mahito — Jujutsu Kaisen
  • Itsuka Shidou — Date A Live
  • Yuki Soma — Fruits Basket (2019)

Full Current Filmography

The following list reflects documented anime, film, and game credits from publicly available industry sources and may not be exhaustive.

Television Anime

  • Parasyte -the maxim- — Shinichi Izumi
  • Sword Art Online: Alicization — Eugeo
  • Blue Lock — Nagi Seishiro
  • Free! — Haruka Nanase
  • Black Clover — Yuno
  • Jujutsu Kaisen — Mahito
  • Date A Live — Shidou Itsuka
  • Fruits Basket (2019) — Yuki Soma
  • Horimiya — Akane Yanagi
  • My Hero Academia — Sir Nighteye’s sidekick Bubble Girl support cast
  • Your Lie in April — Additional Voices
  • A Certain Scientific Railgun T — Gunha Sogiita

Anime Films

  • Parasyte compilation and promotional releases — Shinichi Izumi
  • Sword Art Online Progressive films — Eugeo appearances
  • Free! The Final Stroke — Haruka Nanase
  • Blue Lock Episode Nagi — Nagi Seishiro

Video Games

  • Blue Lock Project: World Champion — Nagi Seishiro
  • Sword Art Online game series — Eugeo
  • Jujutsu Kaisen Phantom Parade — Mahito
  • Granblue Fantasy — Various Roles
  • Disney Twisted-Wonderland — Silver

Critical Reception

Nobunaga Shimazaki’s portrayal of Shinichi Izumi is widely praised for its emotional subtlety and gradual tonal evolution. Critics and fans often point to his ability to portray Shinichi’s increasing emotional numbness without completely losing the humanity that defines the character’s internal conflict.

His performance is considered one of the major strengths of Parasyte -the maxim- and helped elevate the psychological tension of the series.

Our Sources

Adam Gibbs – English Voice of Shinichi Izumi

Date of Birth

Adam Gibbs’ exact birth date is not publicly documented.

About Adam

Adam Gibbs is an American voice actor known for his work in English-language anime dubbing with Sentai Filmworks and HIDIVE. Over the years, he has become especially recognized for portraying emotionally introspective protagonists and psychologically complex characters.

As the English voice of Shinichi Izumi in Parasyte -the maxim-, Gibbs delivered a performance that closely mirrored the character’s dramatic emotional evolution throughout the series. Shinichi begins the story as a nervous and compassionate teenager, but gradually becomes emotionally detached and hardened after merging with Migi and experiencing repeated trauma.

Gibbs’ restrained delivery and gradual tonal changes were widely praised by fans of the dub, particularly during the anime’s darker psychological moments and emotionally intense confrontations.

Outside of Parasyte, Gibbs is also known for major roles in Hyouka, The Eminence in Shadow, Food Wars!, and Haikyu!!.

Hometown

Texas, United States

Career Highlights

  • Shinichi Izumi — Parasyte -the maxim-
  • Hachiman Hikigaya — My Teen Romantic Comedy SNAFU
  • Cid Kagenou / Shadow — The Eminence in Shadow
  • Takumi Aldini — Food Wars!
  • Hotaro Oreki — Hyouka
  • Osamu Dazai — Bungo Stray Dogs
  • Seijuro Akashi — Kuroko’s Basketball
  • Yuri Briar — SPY x FAMILY

Full Current Filmography

The following list reflects documented English dub acting credits from publicly available industry sources and may not be exhaustive.

Television Anime

  • Parasyte -the maxim- — Shinichi Izumi
  • My Teen Romantic Comedy SNAFU — Hachiman Hikigaya
  • The Eminence in Shadow — Cid Kagenou / Shadow
  • Food Wars! — Takumi Aldini
  • Hyouka — Hotaro Oreki
  • Bungo Stray Dogs — Osamu Dazai
  • Kuroko’s Basketball — Seijuro Akashi
  • SPY x FAMILY — Yuri Briar
  • Haikyu!! — Additional Roles
  • No Game No Life — Additional Voices
  • Akame ga Kill! — Additional Voices
  • Made in Abyss — Additional Voices

Anime Films

  • Parasyte promotional and compilation releases — Shinichi Izumi
  • My Teen Romantic Comedy SNAFU Climax! related dub releases — Hachiman Hikigaya
  • Kuroko’s Basketball: Last Game — Seijuro Akashi
  • SPY x FAMILY CODE: White — Yuri Briar

Video Games

  • SMITE anime collaboration appearances
  • The Eminence in Shadow: Master of Garden — Cid Kagenou
  • Bungo Stray Dogs game adaptations — Osamu Dazai
  • Kuroko’s Basketball game projects — Seijuro Akashi

Critical Reception

Adam Gibbs’ portrayal of Shinichi Izumi received strong praise from English dub audiences for its emotional restraint and psychological realism. Fans frequently highlighted how naturally his performance evolved alongside Shinichi’s changing mental state throughout the series.

His work on Parasyte -the maxim- is often regarded as one of the standout performances in Sentai Filmworks’ English dub catalog.

Our Sources

Social Media

Published by mayciballesteros03

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