Japanese voice actor Kenjiro Tsuda has taken TikTok to court over videos that he says used an artificial intelligence-generated imitation of his distinctive voice without permission, putting one of Japan’s best-known voice performers at the center of a potentially important test of how existing rights apply to AI voice cloning.
The dispute involves at least 188 videos posted to TikTok between July 2024 and September 2025 by an account that accumulated around 210,000 followers. Tsuda argues that the synthetic narration used in the videos deliberately imitated his voice and commercially exploited an important part of his identity. TikTok has disputed that interpretation, arguing that the narration amounts to a generic male voice rather than a reproduction uniquely identifiable as Tsuda. The Tokyo District Court is expected to deliver its decision on September 30, 2026.
The case is particularly significant for the voice acting industry because it raises a question that has become increasingly difficult to ignore as generative AI improves. A performer’s face and name are obvious parts of a public identity, but for an actor whose career has been built around a highly recognizable voice, should that voice receive similar protection when technology can generate something designed to sound like it?
Tsuda’s Lawsuit Targets Hundreds of TikTok Videos
According to reports on the case, Tsuda’s complaint centers on at least 188 TikTok videos published over more than a year. His side argues that the AI-generated narration resembled his characteristic deep voice closely enough to exploit the recognition attached to his professional identity. The account behind the videos reportedly generated an estimated ¥500,000 to ¥750,000 per month based on views, adding a significant commercial element to the dispute.
Tsuda’s argument relies in part on publicity rights, which protect the commercial value associated with aspects of an individual’s identity. Applying that concept to an AI-generated voice presents a relatively new legal question. The case does not simply concern an unauthorized recording of Tsuda speaking. Instead, it asks what protections may apply when technology generates new audio that allegedly imitates recognizable characteristics of a real performer’s voice.
TikTok has contested the premise that the narration can be treated as Tsuda’s vocal identity. The platform has argued that it sounds like a generic male voice and that judgments about its similarity to Tsuda are subjective. That disagreement creates an important distinction for performers as synthetic voices become increasingly convincing. A generated voice might share qualities such as pitch, tone or delivery with a particular actor without reproducing an actual recording, making the boundary between general vocal characteristics and a recognizable imitation difficult to define.
The Tokyo District Court’s decision could therefore attract attention well beyond the individual TikTok account involved. The case has been described as the first in Japan seeking legal protection for an individual’s vocal identity against an AI-generated imitation, putting the question of voice cloning directly before the country’s courts.
The Distinctive Voice Behind Nanami, Kaiba and Kishibe
The identity at the center of the case belongs to an actor whose voice has become familiar across several generations of anime. Born in Osaka in 1971, Kenjiro Tsuda has developed a career spanning voice acting, live-action performance, narration and directing, with his low, textured delivery becoming one of his most recognizable professional characteristics.
Among his best-known anime performances is Kento Nanami in Jujutsu Kaisen, the composed and pragmatic jujutsu sorcerer whose restrained personality made particularly effective use of Tsuda’s understated delivery. Another of his defining roles stretches much further back: Seto Kaiba in Yu-Gi-Oh!, the fiercely competitive rival of Yugi whose confidence and intensity helped establish Tsuda’s voice for an earlier generation of anime viewers.
His credits also include Kai Chisaki, better known as Overhaul, in My Hero Academia; Kishibe in Chainsaw Man; Atomic Samurai in One-Punch Man; Hannes in Attack on Titan; and the title character Tatsu in The Way of the Househusband. Outside anime, Tsuda has an extensive Japanese dubbing career that includes providing the Japanese voice of Kylo Ren in the Star Wars sequel films.
That career history gives the current dispute an additional dimension. Recognition of Tsuda is not based solely on his name or appearance. His voice is itself a major component of his professional identity, developed through decades of performances across anime, games, narration and dubbed productions. For audiences familiar with his work, particular vocal qualities can immediately evoke the actor even when he is portraying an entirely new character.
Japan Confronts AI Voice Cloning and Performer Rights
Tsuda’s case arrives as Japanese authorities and performers are already examining how generative AI affects actors, singers and other professionals whose careers depend on recognizable voices. In April 2026, Japan’s Justice Ministry established an expert panel to examine unauthorized AI-generated uses of performers’ voices, part of a broader effort to determine how existing legal protections apply to rapidly developing voice-generation technology.
The issue presents challenges that did not exist when many current legal frameworks were developed. Traditional unauthorized use might involve copying and distributing an actual performance or recording. AI systems can instead produce new speech that was never spoken by the original performer while potentially retaining enough recognizable vocal characteristics to make listeners associate it with that person.
Representatives of Japan’s acting community have consequently pushed for clearer recognition of vocal identity. Japan Actors Union executive director Yuko Sasaki has argued that a person’s ownership and control of their own voice should be treated as a fundamental right. Concerns extend beyond famous performers whose voices might be immediately recognizable to millions of people. Synthetic voice technology could potentially affect narrators, dubbing performers, commercial voice actors and others whose voices have direct professional value even if their names are less widely known.
At the same time, Tsuda’s dispute illustrates why establishing legal boundaries may be complicated. Not every deep voice that resembles another performer can reasonably belong to that actor, and characteristics such as pitch or vocal texture are shared among countless people. Courts and lawmakers may therefore have to grapple with where resemblance ends and deliberate imitation begins, particularly when the generated audio is being used commercially.
A September 30 Decision Could Provide an Early Legal Test
The Tokyo District Court is scheduled to issue its decision on September 30, giving the voice acting industry an unusually concrete legal case to watch. Whatever the outcome, the dispute highlights how AI voice generation is moving questions about performer identity from hypothetical industry discussions into actual courtrooms.
For Tsuda, the central claim concerns something that has been essential to his career for decades. His performances as Nanami, Kaiba, Kishibe and many other characters demonstrate how a voice can acquire recognizable qualities and commercial value without being attached to a performer’s physical appearance. The rise of generative AI now makes it possible for those qualities to be approximated in entirely new recordings that the actor never performed.
The court will have to consider the specific facts and legal arguments in Tsuda’s case rather than settle every question surrounding AI-generated voices. Even so, its treatment of the distinction between a generic synthetic voice and an imitation of an identifiable performer could make the decision particularly relevant to voice actors.
For an industry built around performers creating characters through their voices, that distinction is becoming increasingly consequential. Tsuda’s lawsuit puts a simple but difficult question before the court: when audiences recognize a performer in a synthetic voice, how much control should that performer have over the use of that resemblance?