- Yûko Sanpei
- Renton Thurston
- Kaori Nazuka
- Eureka
- Keiji Fujiwara
- Holland Novak
- Michiko Neya
- Talho Yuki
- Shigenori Yamazaki
- Dominic
- Ami Koshimizu
- Anemone
- Mamoru Miyano
- Moondoggie
- Fumie Mizusawa
- Gidget
- Akio Nakamura
- Matthieu
- Mayumi Asano
- Hilda
- Tamio Ôki
- Ken-Goh / Kuzemi Swigert (voice)
- Chô
- Woz
- Tomoyuki Shimura
- Jobs
- Tarô Yamaguchi
- Hap
- Yasunori Matsumoto
- Stoner
- Yôko Sômi
- Mischa
- Sakiko Tamagawa
- Nirvash / The End (voice)
- Mugihito
- Braya Mattingly
- Mariko Akashi
- Coda Lovell
- Tetsuo Komura
- Jurgens
- Sachiko Kojima
- Maria
- Ken'ichi Ono
- Morita
- Yuriko Yamaguchi
- Female Engineer
- Takahiko Sakaguma
- (voice)
- Oki Sugiyama
- (voice)
- Kensuke Nishi
- (voice)
- Hiromu Miyazaki
- (voice)
- Katsunori Kobayashi
- (voice)
- Haruka Somekawa
- (voice)
- Takeshi Aono
- School Principal
- Yoshiko Sakakibara
- Old Anemone
- Johnny Yong Bosch
- Renton Thurston
- Stephanie Sheh
- Eureka
- Crispin Freeman
- Holland Novak
- Kate Higgins
- Talho Yuki
- Peter Doyle
- Dominic
- Kari Wahlgren
- Anemone / Old Anemone (voice)
- Steve Staley
- Moondoggie
- Jessica Straus
- Gidget
- Kirk Thornton
- Matthieu
- Megan Hollingshead
- Hilda
- Kyle Hebert
- Ken-Goh
- William Frederick Knight
- Kuzemi Swigert
- Dave Wittenberg
- Woz
- Tony Oliver
- Hap
- Doug Stone
- Stoner
- Mary Elizabeth McGlynn
- Mischa
- Melissa Fahn
- Nirvash / The End (voice)
- Michael Forest
- Braya Mattingly
- Barbara Goodson
- Coda Lovell
- Michael McConnohie
- Jurgens
- Peggy O'Neal
- Maria
- Terrence Stone
- Morita
- Julie Ann Taylor
- Young Renton Thurston
- Steve Kramer
- School Principal
