The official JoJo’s Bizarre Adventure X account has announced the supporting cast for Steel Ball Run, the anime adaptation of the manga’s seventh part, which is currently rolling out on Netflix.
Three performers were named, all voicing members of the Boom Boom family: Fumiyoshi Shioya as L. A. Boom Boom, Yoshiki Nakajima as Andre Boom Boom, and Jirou Saitou as Benjamin Boom Boom. The Boom Booms are recurring figures early in the story, which follows a transcontinental horse race across 19th-century America.
The reveal lands while the anime’s 2nd and 3rd STAGEs are still airing. Those episodes began streaming exclusively worldwide on Netflix on September 25, with new instalments arriving weekly.
Who is behind the anime
Yasuhiro Kimura and Hideya Takahashi are directing at David Production, with Toshiyuki Katou — who served as director on Stone Ocean — credited as series director. Yasuko Kobayashi, whose credits include Dororo, is handling series composition, while Daisuke Tsumagari is designing the characters and serving as chief animation director. Yugo Kanno, whose recent work includes Pluto, is composing the music.
David Production has carried the JoJo anime through its previous parts, so the studio’s return for Steel Ball Run keeps the visual continuity that fans have followed since Phantom Blood. The new cast members join a production that has already drawn heavy attention for its release model, split into labelled STAGEs rather than a single continuous season.
Where Steel Ball Run fits in JoJo
Hirohiko Araki originally launched Steel Ball Run in Weekly Shonen Jump in January 2004 as a story not yet tied to the main series. After the manga transferred to Ultra Jump in April 2005, it became an official part set in an alternate timeline. Shueisha published it in 24 volumes between May 2004 and June 2011, then recompiled the story into 16 volumes between February 2017 and January 2018.
The seventh part is a departure from the lineage before it. Its protagonists, former jockey Johnny Joestar and outlaw Gyro Zeppeli, are thrown together by a cash-prize race across America, with conspiracies and supernatural threats running underneath the competition. That premise is why the supporting roster matters: the early stages introduce a large, colourful field of racers, and the Boom Boom family sits squarely within it.
The wider franchise remains active. The eighth part, JoJolion, ran for about a decade and ended in Ultra Jump in August 2021, and its final volume followed that September. The ninth part, The JoJoLands, began in February 2023, with Shueisha releasing its ninth volume on September 17.
Why it matters
Cast reveals are the steady drumbeat that keeps a weekly Netflix rollout in the conversation, and Steel Ball Run has an audience that watches each announcement closely. For a part as densely populated as this one, who plays whom is genuinely useful information for viewers following along episode by episode rather than bingeing.
It also shows the production is still being actively promoted after launch, rather than treated as a finished package dropped all at once. Netflix has experimented with different release shapes for its anime, and the weekly pattern here means announcements like this one can stretch the story’s visibility well past its premiere date.
For more on this release, see our coverage of the ending theme backlash around the Dr. Luke credit. You can also catch the wider season in our Fall 2026 anime ranking.
Source: MyAnimeList (via the series’ official X account)
Featured image: Key visual for Steel Ball Run: JoJo’s Bizarre Adventure, via MyAnimeList.
