Yumiko Kobayashi

Kobayashi is a freelance Japanese voice actress raised in Chiba Prefecture who has worked in the industry since 1998. She is best known today as the voice of Shinnosuke Nohara in Crayon Shin-chan and also has ties to the One Piece franchise through its Japanese voice cast.

Kobayashi's highest-profile credit came in July 2018, when she succeeded veteran actress Akiko Yajima as the voice of Shinnosuke Nohara in Crayon Shin-chan, a role Yajima had originated back in 1992. Kobayashi has cited Yajima's earlier performance as Kevin in the Japanese dub of Home Alone as an influence on how she approaches child roles.

Kobayashi began voice acting in 1998 while still a college student, debuting as Mita in the series Kirara. Three years later she landed her first lead role, voicing Kento Yuki in Dennou Bokenki Webdiver.

Kobayashi remains close friends with fellow actresses Nana Mizuki, Hisayo Mochizuki, and Natsuko Kuwatani, having shared the stage with them in Sister Princess as part of the vocal unit Prits. That connection dates back to earlier in her career, before her later lead role on Crayon Shin-chan.

Kobayashi's specific contribution to One Piece is not detailed in the sources consulted for her profile. She is included among the extensive Japanese voice cast credited on the long-running Toei Animation series, alongside her more prominent lead work like Crayon Shin-chan.