Kenjiro Tsuda Sues TikTok Operator Over AI Voice

Kenjiro Tsuda, a well-known Japanese voice actor, filed a lawsuit at the Tokyo District Court in November 2025 seeking removal of short-form videos on TikTok that his legal team alleges used generative AI to imitate his voice, according to The Yomiuri Shimbun and NewsOnJapan. The complaint asserts at least 188 videos were posted between July 2024 and November 2025, per The Yomiuri Shimbun and CBR. Reporting states the videos covered topics such as urban legends and trivia and were uploaded by an unidentified account, per The Yomiuri Shimbun and NewsOnJapan.

The plaintiff alleges the narrations were produced by generative AI and closely resembled Tsuda's distinctive low, mellow voice, as described in reporting by The Yomiuri Shimbun and CBR. The lawsuit cites the Unfair Competition Prevention Law and the "right of publicity" as legal grounds for removal, according to The Yomiuri Shimbun. The defendant, identified in reporting as the operator of TikTok, has argued the narrations were made with a "universal male voice," and that the uploader stated the model learned a friend's voice on an external site, per The Yomiuri Shimbun. The Yomiuri Shimbun reports three closed-door clarification proceedings have occurred and that a first oral argument may be held this summer.

Industry-pattern observations: advances in generative audio models have made realistic, celebrity-like voice synthesis widely accessible, lowering the technical barrier for high-volume content production. Companies and creators using voice synthesis often rely on user-provided voice samples or third-party model services; public reporting in this case does not identify the specific model or vendor used. Detection and attribution of synthetic voice remains technically challenging at scale, and reported litigation tends to focus on identifiable usage patterns, distribution channels, and monetization rather than solely on acoustic similarity.

reporting by The Yomiuri Shimbun frames this as likely the first lawsuit in Japan alleging unauthorized AI voice cloning of a celebrity. Legal claims invoking the right of publicity and the Unfair Competition Prevention Law raise cross-cutting questions about platform liability, creator monetization, and remedial takedown mechanisms for AI-generated content. For global observers, the case will be one of several jurisdictional tests of how existing intellectual property, publicity, and unfair-competition frameworks apply to synthetic media.

Observers should watch for the Tokyo District Court's schedule for oral argument and any written rulings that clarify how Japanese law treats AI-generated voice likenesses (The Yomiuri Shimbun). Key evidentiary issues will include proof of acoustic similarity, the uploader's disclosures about model provenance, claimed revenues (reported as ¥500,000 to ¥750,000 per month by The Yomiuri Shimbun and CBR), and the operator's content-moderation role as reported by The Yomiuri Shimbun. The extent to which the court addresses platform liability and remedies under existing statutes will shape follow-on litigation and policy discussions in Japan and elsewhere.