The character of Akitaru Obi in the hit anime series Fire Force (En'en no Shouboutai) is voiced by Kazuya Nakai in the original Japanese version and Jeremy Inman in the English dub. These two seasoned performers bring the charismatic, unpowered leader of Special Fire Force Company 8 to life, balancing his intense physical presence with a deeply compassionate moral center.
Akitaru Obi is a unique figure in the Fire Force universe. Unlike the majority of his subordinates and peers, he possesses no pyrokinetic abilities. He is a "First Generation" human who relies entirely on rigorous physical training, heavy specialized equipment, and an indomitable will to fight the Infernals. Because the character serves as the emotional and tactical anchor of the series, the choice of voice talent was critical to establishing the show's tone. As of 2026, their performances remain benchmarks for how to portray authority figures in the shonen genre.
The Japanese Voice of Akitaru Obi: Kazuya Nakai
In the original Japanese broadcast, Akitaru Obi is voiced by Kazuya Nakai, a veteran seiyuu (voice actor) whose name is synonymous with some of the most iconic "tough guy" roles in anime history. Nakai’s casting as Obi was met with immediate approval from the fanbase due to his ability to project a gravelly, authoritative tone that doesn't sacrifice warmth.
A Career Built on Iconic Swordsmen and Leaders
Kazuya Nakai, born in November 1967 in Kobe, Japan, has been a staple of the anime industry since the mid-1990s. He is perhaps most world-renowned for voicing Roronoa Zoro in One Piece, a role he has held for over two decades. The parallels between Zoro and Obi are notable: both are characters defined by their extreme discipline, physical strength, and loyalty to their crew.
However, Nakai’s range extends beyond just the "silent warrior" archetype. His portrayal of Toshiro Hijikata in Gintama showcased his ability to handle comedic timing and high-stress shouting matches, while his role as Mugen in Samurai Champloo highlighted a more erratic, wild energy. For Akitaru Obi, Nakai draws on a blend of these experiences. He provides Obi with a "big brother" energy—someone who can scream orders on a battlefield one moment and offer fatherly advice the next.
Why Nakai’s Performance Works for Obi
The challenge of voicing Obi is his lack of superpowers. In a world where characters can fly or create explosions, Obi’s "power" is his human spirit. Kazuya Nakai’s voice carries a certain "weight" that makes the viewer believe Obi can go toe-to-toe with supernatural threats. When Obi dons his heavy fire-fighting gear, Nakai’s vocal delivery becomes more resonant, emphasizing the physical toll and the sheer effort the Captain puts into every movement.
In the more emotional sequences—such as when Obi explains the importance of respecting the dead even when they have become Infernals—Nakai softens his register. This nuance is vital for the series’ themes of grief and duty, ensuring that Obi isn't just a caricature of a muscular leader but a deeply empathetic man.
The English Voice of Akitaru Obi: Jeremy Inman
For the English-speaking audience, the mantle of Akitaru Obi is carried by Jeremy Inman. Inman is a prolific voice actor and ADR (Automated Dialogue Replacement) director associated heavily with Crunchyroll (formerly Funimation). His portrayal of Obi has been praised for capturing the same sense of earnestness and "blue-collar hero" vibes found in the original Japanese performance.
A Veteran Presence in the Dubbing Industry
Jeremy Inman has been a part of the anime dubbing world for many years, often taking on roles that require a deep, commanding presence. He is well-known to the Dragon Ball community for voicing Android 16 in Dragon Ball Z Kai, a character who, much like Obi, is physically imposing but possesses a gentle heart.
Inman’s background as an ADR director gives him a unique perspective on his acting roles. He understands the mechanics of how a scene is built and how to pace his lines to match the emotional beats of the animation. This experience is evident in Fire Force, where Obi often has to deliver long tactical explanations or motivational speeches during chaotic action sequences.
Capturing the "Captain" Persona
In the English dub, Inman gives Obi a voice that sounds slightly more like a traditional first responder—rough around the edges but inherently trustworthy. His performance leans into the "Fire Captain" aesthetic, making Obi feel like someone you would actually encounter in a high-stakes emergency situation.
One of Inman’s greatest strengths in the role is his chemistry with the rest of the English cast. Whether he is playing the straight man to Arthur Boyle’s delusions or serving as a mentor to Shinra Kusakabe, Inman’s Obi feels like the glue holding Company 8 together. As the series progressed through its various seasons, Inman’s comfort with the character allowed him to explore the more humorous aspects of Obi’s personality, particularly his obsession with weightlifting and "muscle training" as a solution to all problems.
Comparing the Two Performances
While Nakai and Inman bring their own cultural nuances to the role, both actors focus on the core pillar of Akitaru Obi’s character: sincerity. Obi is a man who cannot lie and who wears his heart on his sleeve.
| Feature | Kazuya Nakai (Japanese) | Jeremy Inman (English) |
|---|---|---|
| Primary Tone | Gritty, disciplined, authoritative | Robust, commanding, relatable |
| Notable Other Role | Roronoa Zoro (One Piece) | Android 16 (Dragon Ball Z Kai) |
| Approach to Obi | Emphasizes "Old School" leadership | Emphasizes "Everyday Hero" charisma |
| Years Active | 1995–Present | 2000s–Present |
| Defining Characteristic | Deeply resonant "warrior" voice | Reliable "commanding officer" voice |
The Japanese performance by Nakai often feels more rooted in the traditions of samurai-like discipline, which fits the aesthetic of Fire Force’s world (which blends modern firefighting with Shinto-inspired religious elements). In contrast, Inman’s English performance makes the character feel more accessible to Western audiences who are familiar with the trope of the "tough but fair" coach or captain.
The Importance of Akitaru Obi’s Voice in the Series Narrative
To understand why these voice actors are so vital, one must look at the narrative function of Akitaru Obi. In many shonen series, the mentor or captain is often a "retired" powerhouse who is stronger than the protagonist. Obi flips this trope. He is physically strong, but in terms of raw pyrokinetic output, he is the "weakest" member of his team.
The voice actors must convey strength without the aid of "power-up" screams or supernatural sound effects. When Obi fights, the audience hears the grunt of physical exertion and the clanking of metal. Both Nakai and Inman excel at these non-verbal vocalizations, which ground the show in a sense of realism that contrasts with the fantastical fire abilities of other characters.
Key Scenes for the Voice Actors
There are several pivotal moments in Fire Force where the voice acting elevates the material:
- The Confrontation with Company 1: When Obi stands his ground against superior officers, his voice must project an unwavering moral authority. Nakai’s delivery here is sharp and icy, while Inman sounds like a man who has reached the limit of his patience but remains professional.
- The "Never Show Your Weapons" Speech: This is one of Obi's most famous moments, where he explains why fire soldiers should never show their weapons to the public or the grieving families of Infernals. The performance here requires a delicate balance of sternness and profound empathy.
- The Physical Training Gags: Both actors do a fantastic job with the comedic elements of Obi’s character, particularly when he is shown lifting absurd amounts of weights in the office. This "himbo" energy provides much-needed levity in an otherwise dark series.
Technical Details and Production Context
Fire Force, produced by David Production, is known for its incredible sound design. The "clanging" and "mechanical" sounds associated with Obi’s gear are often timed to match the cadence of the voice actors. As the series reached its climax and moved toward its final adaptations by 2026, the consistency of the voice cast remained a top priority for the studio.
The series was directed by Yuki Yase (Season 1) and Tatsuma Minamikawa (Season 2), both of whom emphasized the importance of the "voice of the firehouse." The recording environment for both the Japanese and English versions required the actors to maintain high energy levels, as Obi is rarely a character who sits still.
Career Trajectories of the Actors as of 2026
As of 2026, both Kazuya Nakai and Jeremy Inman have solidified their legacies in the industry.
- Kazuya Nakai continues to be one of the most sought-after seiyuu in Japan. While One Piece continues to be his primary commitment, his work on Fire Force is frequently cited in retrospectives of his career as a perfect example of his "leader" archetype.
- Jeremy Inman has expanded his work in ADR directing, helping to shape the next generation of English dubs while continuing to lend his voice to major franchises. His portrayal of Obi is often used as a teaching tool for how to balance "big" voices with realistic emotional grounding.
Frequently Asked Questions
Is Akitaru Obi’s voice actor the same as Zoro’s?
Yes, in the Japanese version, Akitaru Obi is voiced by Kazuya Nakai, who is most famous for his role as Roronoa Zoro in One Piece. His distinct, gravelly voice is a hallmark of both characters, though Obi is generally more expressive and vocal than the stoic Zoro.
Does the voice actor change in Season 2 or Season 3?
No, the voice actors for Akitaru Obi have remained consistent throughout the series. Kazuya Nakai (JP) and Jeremy Inman (EN) have voiced the character in every season produced up to 2026. This consistency is a major reason why the character's development feels so cohesive.
Who voices Obi in the Fire Force video games?
In most official Fire Force media, including mobile games and collaborations, the original anime voice cast is used. Therefore, you will hear Kazuya Nakai in the Japanese versions and Jeremy Inman in the English versions of these games.
What other characters has Jeremy Inman voiced?
Beyond Akitaru Obi, Jeremy Inman is well-known for voicing Magellan in One Piece, Android 16 in Dragon Ball Z Kai, JJ in Yuri!!! on ICE, and various characters across the My Hero Academia and Black Clover franchises.
Why is Akitaru Obi's voice so deep?
The deep vocal range chosen for Obi is intended to reflect his physical maturity and his role as a "father figure" to the younger members of Company 8. Since he is an unpowered human who relies on muscle, a deep, resonant voice helps convey his strength and authority.
Final Recommendation for Fans
If you are a fan of Akitaru Obi, it is highly recommended to experience both the Japanese and English versions of Fire Force. While the subtitles provide the original intensity of Kazuya Nakai’s legendary performance, the English dub features a stellar turn by Jeremy Inman that captures the heart of the character in a way that feels uniquely authentic to the English language. For those interested in the craft of voice acting, comparing how these two actors handle Obi's high-stress tactical commands versus his quiet moments of compassion is a masterclass in character-driven performance.
