In “Demon Slayer: Kimetsu no Yaiba Hashira Training Arc,” the main characters include:

1. Zenitsu Agatsuma, voiced by Hiro Shimono in Japanese and José Luis Piedra in Spanish.
2. Inosuke Hashibira, voiced by Yoshitsugu Matsuoka in Japanese and Uraz Huerta in Spanish.
3. Nezuko Kamado, voiced by Akari Kitou in Japanese and Annie Rojas in Spanish.
4. Tanjirou Kamado, voiced by Natsuki Hanae in Japanese and Iván Bastidas in Spanish.

Supporting characters in the arc include:

1. Gyoumei Himejima, voiced by Tomokazu Sugita in Japanese and Gerardo Reyero in Spanish.
2. Obanai Iguro, voiced by Kenichi Suzumura in Japanese and Arturo Cataño in Spanish.
3. Mitsuri Kanroji, voiced by Kana Hanazawa in Japanese and Melissa Gedeón in Spanish.
4. Shinobu Kochou, voiced by Saori Hayami in Japanese and Cristina Hernández in Spanish.
5. Sanemi Shinazugawa, voiced by Tomokazu Seki in Japanese.
6. Muichirou Tokitou, voiced by Kengo Kawanishi in Japanese and Armando Corona in Spanish.
7. Giyuu Tomioka, voiced by Takahiro Sakurai in Japanese and Marc Winslow in Spanish.
8. Tengen Uzui, voiced by Katsuyuki Konishi in Japanese.

The staff involved in the production includes Haruo Sotozaki as the director, with theme song performances by Hyde and MY FIRST STORY. The original creator of the series is Koyoharu Gotouge, and various artists and musicians contributed to the character design, music, art direction, and animation of the arc. Marc Winslow serves as the ADR director for the English dub.