- Christopher Courage
- Amano
- Rebel Joy
- Akemi Ito / Changing Gymnast / True Overfiend (fetus) (voice)
- Sonny Weil
- Kuroko / Enkakuki / Harem Girl / Malformed Demon / Metropolis Demon / Niki's Mother / Nurse (voice) (as Rose Palmer)
- Bick Balse
- Ozaki
- Jurgen Offen
- Suikakujyu
- Barbie O'Buoy
- Chanign Gymnast / Fukakuki / Harem Girl / Kitako Togami (human voice) / Orgy Leader (voice)
- Camille Way-Pene
- Changing Gymnast / Girl in Pain / Gymnast in Glasses (voice)
- Greg Puertolas
- Jujinkai Elder
- Kathleen McNearney
- Harem Girl / Makai Queen / Peering Gymnast (voice)
- Herb Hummel
- Dragon Gang Leader / Satsuki (voice)
- Ron Kalish
- Bald Beast-Man / Man Absorbed by the Chojin / Niki's Father / Old Man in the Future (voice)
- Lucy Morales
- Megumi Amano / Gossiping Girls (voice)
- Anthony Rocissano
- Narrator
- Bill Timoney
- Tatsuo Nagumo / Overfiend / Basketball Stadium Announcer / Basketball Team Member / Blonde Beast-Man / Doctor / Intro Demon / Kitako Togami (demon voice) / Lecher / University Students / Myojin University Professor / True Overfiend (fetus) (voice) (as Danny Bush)
- Minako Arakawa
- Girl
- Mizuka Arima
- Ms. Togami
- Yôko Asagami
- Akemi Ito
- Daisuke Gôri
- Great Elder / Mr. Niki (uncredited)
- Ken'yû Horiuchi
- Yoriichi Ozaki
- Tsutomu Kashiwakura
- Kuroko
- Satoko Kitô
- Leotard Girl
- Miyuki Matsushima
- True Chojin
- Miyuki Matsushita
- True Chojin
- Shigeru Nakahara
- Basketball Club
- Hidetoshi Nakamura
- Doctor
- Tomohiro Nishimura
- Amano Jaku
- Shinji Ogawa
- Narrator
- Maya Okamoto
- Megumi Amano
- Ken'ichi Ono
- Majin
- Natsumi Sasaki
- Girl
- Hirotaka Suzuoki
- Tatsuo Nagumo
- Yumi Takada
- Nurse
- Nobuo Tobita
- Jujin
- Kôji Totani
- Majin
- Narumi Tsunoda
- Girl
- Norio Wakamoto
- Suikakuju
- Randy Woodcock
- Niki
- Kôichi Yamadera
- Yuichi Niki
