Note: I own nothing. All credit goes to Disney, The writer and Director and actors.
Ponyo = Noah Cyrus.
Sosuke = Frankie Jonas.
Lisa = Tina Fey.
Koichi = Matt Damon.
Fujimoto = Liam Needson
Granmanmare = Cate Blenchett.
Ponyo's Sisters = Akiko Yano ( English voice unknown)
Suigyo = George Tokoro ( English voice unknown)
Toki = Lily Tomlin
Yoshie = Betty White
Kayo = Cloris Leachman.
Mother = Rumi Hiiragi ( English voice unknown)
*Announcer = Shinichi Hatori.
* Kumiko = Eimi Hiraoka
* Karen = Nozomi Ohashi
* All English voices unknown.
Enjoy
Ponyo = Noah Cyrus.
Sosuke = Frankie Jonas.
Lisa = Tina Fey.
Koichi = Matt Damon.
Fujimoto = Liam Needson
Granmanmare = Cate Blenchett.
Ponyo's Sisters = Akiko Yano ( English voice unknown)
Suigyo = George Tokoro ( English voice unknown)
Toki = Lily Tomlin
Yoshie = Betty White
Kayo = Cloris Leachman.
Mother = Rumi Hiiragi ( English voice unknown)
*Announcer = Shinichi Hatori.
* Kumiko = Eimi Hiraoka
* Karen = Nozomi Ohashi
* All English voices unknown.
Enjoy