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11 Kenichiro Thomson is the English voice actor credited with the protagonist role of Musashi Miyamoto in Onimusha: Way of the Sword. His casting was publicly announced by Capcom's official Onimusha channels in February 2025, in the same wave of marketing that confirmed the game's protagonist and revealed Toshiro Mifune as the face model for the character. The announcement paired the two names explicitly, framing the face-and-voice split as a deliberate creative choice rather than a technical afterthought.
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33 Overview
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55 Thomson is a British-Japanese actor and voice artist based in London. He is listed as multi-lingual, with English, Spanish, and Japanese spoken fluently, along with working German, and his career to date has spanned television, film, stage, and voice work. Onimusha: Way of the Sword represents his first major credit as the English voice of a lead video-game protagonist, a role large enough that Capcom treated the casting itself as marketing material rather than as a line item buried in the end credits.
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77 The Japanese-language performance of Musashi is handled by Yoshimasa Hosoya. The two voice tracks were announced together with the face-model credit, which means the public presentation of Musashi was never anchored to a single performer but to a trio: Mifune supplying the face, Hosoya the Japanese voice, and Thomson the English voice. That arrangement is unusual enough that it became part of how the character has been discussed across previews and trailer reactions since the initial gameplay reveal.
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99 Role on Way of the Sword
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1111 Thomson's responsibility is the English-language dialogue and vocal performance for the protagonist across the entire game. That scope covers the cinematic story scenes, the barks and shouts that play during combat, any quiet in-world dialogue with allies, and the incidental vocalisation tied to traversing the city and wielding the Oni Gauntlet. Because Musashi is present in every story beat of the game and is the only playable character disclosed so far, Thomson's voice carries the full weight of the English performance.
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1313 The split between face and voice places a particular demand on the performance. The face model is locked to Mifune's likeness, a face that carries a dense set of viewer associations with classic samurai cinema, so the English voice has to land a Musashi that feels coherent with that face without becoming an impression of the actor behind it. Capcom's framing describes Thomson as talented in the initial announcement, which is the only descriptor the publisher has attached publicly, but the scale of the role is implicit in how the game is built: this is a single-protagonist action title, and the lead voice is carrying every scripted line the player will hear in English across a roughly twenty-hour campaign.
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1515 Casting Announcement
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1717 The casting was confirmed through the official Onimusha social channels on 12 February 2025, roughly ten days after the first gameplay trailer debuted during a State of Play broadcast on 2 February 2025. The Capcom post named Thomson as the English voice of Musashi, named Mifune as the face model, and attached the the talented Kenichiro Thomson phrasing that has been reused in downstream coverage. The wording set the expectation that the voice cast was a deliberate curatorial choice by the team rather than a generic localisation pass added late in production.
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1919 Pairing the voice and face announcements in a single post was a notable choice. It meant that from the moment Musashi was introduced to the wider public as a named protagonist, audiences knew the character was a composite: an iconic face, a modern Japanese voice performance, and a separate English voice performance. That framing fed directly into later previews, where the visible-and-audible identity of Musashi was discussed as a deliberate construction rather than as one actor delivering the full package.
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2121 Career Background
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2323 Thomson's prior credits sit primarily in live-action British and international television. His recurring television role is as Martin in the political drama The Diplomat, which began airing in 2023, where he is credited across eleven episodes of the show. He also appears in Britannia, the historical drama first released in 2017, and in the independent 2025 feature Two Big Feet, directed by Noah Stratton-Twine, in which he plays the character Frank. The film received a UK release in March 2025.
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2525 Because his on-screen credits already span period drama and contemporary political drama in English, and because his Japanese fluency is public record, Thomson fits the brief Capcom was working to fill on Way of the Sword more neatly than a generic English-speaking voice actor would. The role demands an English-language performer who can carry a historical Japanese setting without the result sounding like an out-of-period dub, and his stage and television background supplies that voicing register without relying on affected delivery.
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2727 CreditYearRoleBritannia2017Television drama (historical)The Diplomat2023Martin (recurring, eleven episodes)Two Big Feet2025Frank (independent feature)Onimusha: Way of the Sword2026Musashi Miyamoto (English voice, lead)
2828 Voice Direction and Production Context
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3030 The game is built on the in-house RE Engine and is directed by Satoru Nihei with Akihito Kadowaki producing. That production context matters for the voice work because the development team has been explicit that the game pursues historical authenticity in its setting, costuming, and period language. Musashi's English performance sits inside that frame, meaning the brief is to deliver the lines clearly in English and to do so without undercutting the recreation of Edo-era Kyoto the rest of the presentation is building.
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3232 The combat system also shapes the scope of the voice performance. Way of the Sword leans on the Issen counter, posture management, and soul absorption through the Oni Gauntlet as its core loop, which means the English voice track has to cover a large volume of combat vocalisation alongside the cinematic dialogue. Grunts, breath, shouted commands, and the vocal beats tied to special attacks are all part of the role, and those combat-side lines typically outnumber the scripted cinematic dialogue in an action game of this length.
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3434 Cast Credits
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3636 RolePerformerFace model for MusashiToshiro Mifune (archival likeness, licensed)Japanese voice for MusashiYoshimasa HosoyaEnglish voice for MusashiKenichiro Thomson
3737 No other English cast members have been publicly named at the same level of prominence as Thomson. The Capcom marketing has foregrounded the protagonist's voice rather than the full ensemble, which fits the pattern of how the publisher has chosen to introduce the game: Musashi first and most thoroughly, the supporting characters afterwards, and the broader voice cast rolled out closer to launch. Thomson's casting is therefore the only English voice credit for the game that has been confirmed through an official Capcom channel rather than inferred from later material.