- Mana Ashida
- Yui
- Sari Awano
- Hiyori
- Ben Balmaceda
- Toyosawa River Kappa / Yoshi's Nephew / Additional Voices (voice)
- Casey Casper
- Yoshi
- Brook Chalmers
- Shizukuishi River Kappa / Reiko's Grandfather / Additional Voices (voice)
- Pam Dougherty
- Kiwa
- Caitlin Glass
- Tomoko / Reiko's Mother / Additional Voices (voice)
- Alan Lee
- Kitakami River Kappa / Reiko's Brother (voice)
- Michelle Marie
- Reiko
- Risa Mei
- Hiyori
- Madeleine Morris
- Yui
- Brent Mukai
- Tanaka Jizo / Additional Voices (voice)
- Mike Pollock
- Sarugaishi River Kappa
- Lucas Schuneman
- Mabechi River Kappa / Additional Voices (voice)
- Laura Megan Stahl
- Female Staff Member / Additional Voices (voice) (as Laura Stahl)
- Kaiji Tang
- Kozuchi River Kappa / Yui's Father (voice)
- Takuya Tasso
- Kozuchigawa no kappa
- Sarah Wiedenheft
- House Spirit / Additional Voices (voice)
- Shinobu Ôtake
- Kiwa-san
