Voice actor Kenjirō Tsuda has filed a lawsuit against TikTok's operator at the Tokyo District Court, alleging that the platform allowed an unidentified user to post at least 188 AI-generated narration videos imitating his distinctive voice without authorization. The case — filed in November 2025 — raises urgent questions about generative AI's impact on the voice acting industry.
The Case
Tsuda's legal team, led by lawyer Kei Hirano, argues that videos posted between July 2024 and the lawsuit filing feature AI-generated narration mimicking Tsuda's signature "smooth, low-pitched" and "deep, husky" voice. The unidentified account reportedly earned between 500,000-750,000 yen per month (approximately US$3,140-$4,396) from the videos, which narrated urban legends and trivia content, misleading viewers into believing it was Tsuda's actual voice.
Three closed-door pre-trial proceedings have already been held, with the first oral argument expected in summer 2026.
Plaintiff's Arguments
Tsuda seeks removal of the videos under Japan's Unfair Competition Prevention Act and argues violation of his right of publicity — the right to control the commercial use of one's identity, including voice.
"If unauthorized production is left unchecked, it could hinder the development of the voice acting industry."
"We hope to clarify the scope of illegality and encourage voice actors to exercise their rights by winning the case."
Defendant's Position
TikTok's Japanese subsidiary maintains that the voice in question is a "universal male voice" created by training AI on a friend's voice, and that a disclaimer on the poster's external website clearly states the narration is AI-generated. TikTok denies that there is confusion or any legal violation, and also argues that comments on the videos were about content rather than the narration voice, therefore not infringing on publicity rights.
Kenjirō Tsuda: A Voice Like No Other
Tsuda is one of Japan's most recognizable voice actors, known for his deep, gravelly voice that has become iconic across anime, video games, and live-action dubbing:
- Kento Nanami — Jujutsu Kaisen (呪術廻戦)
- Seto Kaiba — Yu-Gi-Oh! (遊☆戯☆王)
- Tatsu — The Way of the Househusband (極主夫道)
- Hyakunosuke Ogata — Golden Kamuy (ゴールデンカムイ)
- Sadaharu Inui — The Prince of Tennis (テニスの王子様)
His signature voice — described by fans as simultaneously menacing, smooth, and authoritative — has made him a frequent target of AI voice imitation, a problem increasingly faced by prominent Japanese voice actors.
Industry Implications
This lawsuit is among the highest-profile legal challenges to AI voice replication in the Japanese entertainment industry. Unlike the Western market, where several high-profile disputes have centered on AI vocal performance (including actors' strikes in Hollywood addressing AI protections), Japan's voice acting industry — the largest in the world by volume — has been slower to establish legal frameworks around AI voice replication.
The case could set a landmark precedent for how Japanese law treats AI-generated imitations of professional performers' voices, with significant implications for the estimated 1,000+ working voice actors in Japan whose distinctive vocal qualities are integral to their professional identity and livelihood.
Community Reception
The news has generated widespread discussion across anime communities. On MyAnimeList forums, the case was the subject of heated debate, with users overwhelmingly supportive of Tsuda's action while expressing concern about the broader implications of AI voice cloning for the industry. Many fans noted Tsuda's voice is one of the most distinctive in the industry — making him a particularly clear victim of unauthorized imitation. The case has also sparked discussions about the adequacy of Japan's current legal protections for performers in the age of generative AI.
What This Means
The Tsuda vs. TikTok case is poised to become a defining legal test for AI voice rights in Japan. As generative AI tools become increasingly capable of replicating professional voices with minimal training data, the industry needs clear legal boundaries. A ruling in Tsuda's favor could establish that voice — like likeness and name — is a protected element of publicity rights under Japanese law, giving performers a legal tool against unauthorized AI replication. The summer 2026 oral argument will be closely watched by talent agencies, streaming platforms, and voice actors across the industry.
Sources: Anime News Network, Yomiuri Shimbun Online (via DenFamiNicoGamer, Yaraon!)