- Makoto Tsumura
- Â Astro Boy / ... 50 episodes, 2003-2004
- Hisashi Katsuta
- Â Dr. Ochanomizu 50 episodes, 2003-2004
- Roland Angelo Crisolo
- Â Shibugaki 50 episodes, 2003-2004
- Hirakazu Shibayama
- Â Policeman / ... 40 episodes, 2003-2004
- Akiko Kawase
- Â Yuko Kisaragi / ... 29 episodes, 2003-2004
- Banjô Ginga
- Â Inspector Tawashi 27 episodes, 2003-2004
- Kôichi Sakaguchi
- Â Barris / ... 21 episodes, 2003-2004
- Yûko Satô
- Â Kenichi / ... 21 episodes, 2003-2004
- Susumu Chiba
- Â Shibugaki / ... 20 episodes, 2003-2004
- Miki Maruyama
- Â Uran 18 episodes, 2003-2004
- Motoko Kumai
- Â Tamao 17 episodes, 2003-2004
- Shin'ya Ôwada
- Â Dr. Tenma 17 episodes, 2003-2004
- Rio Kaneoka
- Â Child / ... 15 episodes, 2003-2004
- Naoki Tatsuta
- Â Robita 13 episodes, 2003-2004
- Kôji Ishii
- Â Mr. Lamp 12 episodes, 2003-2004
- Yoshinori Sonobe
- Â Policeman / ... 12 episodes, 2003-2004
- Yûgo Takahashi
- Â Billy / ... 11 episodes, 2003-2004
- Makoto Higo
- Â Nyanko's Father / ... 10 episodes, 2003-2004
- Hideyuki Tanaka
- Â Blue Knight 10 episodes, 2004
- Bon Ishihara
- Â Dave / ... 8 episodes, 2003-2004
- Takehito Koyasu
- Â Dr. Kato / ... 7 episodes, 2003-2004
- Tabitha St. Germain
- Â Additional Voices / ... 7 episodes, 2003-2004
- Kôji Yusa
- Â Blues / ... 6 episodes, 2003-2004
- Saburô Kamei
- Â Chairman Lyon 6 episodes, 2004
- Kazuki Yao
- Â Skunk Kusai 5 episodes, 2003-2004
- Nobuyuki Hiyama
- Â Atlas 5 episodes, 2003-2004
- Sanae Kobayashi
- Â Midori Niwano 5 episodes, 2003-2004
- Daisuke Sakaguchi
- Â Butch / ... 5 episodes, 2004
- Akio Ôtsuka
- Â Pluto 4 episodes, 2003-2004
- Rikiya Koyama
- Â Katari 4 episodes, 2003-2004
- Akiko Hiramatsu
- Â Epsilon 4 episodes, 2003-2004
- Kôsei Tomita
- Â Shunsaku Kisaragi 4 episodes, 2003-2004
- Toshihiko Nakajima
- Â Jazz / ... 4 episodes, 2003-2004
- Tetsuo Sakaguchi
- Â Sundance 4 episodes, 2003-2004
- Rie Kugimiya
- Â Nyanko 4 episodes, 2003
- Akiko Kômoto
- Â Ena 4 episodes, 2004
- Tarô Ishida
- Â Duke Red 4 episodes, 2004
- Hidetoshi Nakamura
- Â Gordon 4 episodes, 2004
- Kenji Utsumi
- Â Tokugawa 3 episodes, 2003-2004
- Kiyoyuki Yanada
- Â Harley 3 episodes, 2003-2004
- Daiki Nakamura
- Â Hercules 3 episodes, 2003-2004
- Rumi Kasahara
- Â Announcer / ... 3 episodes, 2003-2004
- Shôko Tsuda
- Â Chris / ... 3 episodes, 2003-2004
- Kozue Kamada
- Â Child / ... 3 episodes, 2003-2004
- Keisuke Baba
- Â Hunter Robot / ... 3 episodes, 2003
- Takeshi Sasaki
- Â Mechanic / ... 3 episodes, 2003
- Shin'ichirô Miki
- Â Gulliver / ... 2 episodes, 2003-2004
- Chô
- Â Ham Egg 2 episodes, 2003-2004
- Mami Koyama
- Â Sarah Jones 2 episodes, 2003-2004
- Megumi Toyoguchi
- Â Carla 2 episodes, 2003-2004
- Takeshi Aono
- Â Dr. Mini Mini 2 episodes, 2003-2004
- Keiko Takeshita
- Â Phoenix 2 episodes, 2003-2004
- Tomohisa Asô
- Â Ishida / ... 2 episodes, 2003-2004
- Mitsuru Ogata
- Â Dr. Kisaragi / ... 2 episodes, 2003-2004
- Ai Satô
- Â Lady / ... 2 episodes, 2003-2004
- Masashi Hirose
- Â Panna Cotta / ... 2 episodes, 2003-2004
- Shigeru Shibuya
- Â Driver / ... 2 episodes, 2003-2004
- Mayuko Takahashi
- Â Child / ... 2 episodes, 2003-2004
- Fumiya Fujii
- Â Rock Holmes 2 episodes, 2003-2004
- Machiko Tanaka
- Â Boy / ... 2 episodes, 2003-2004
- Yûko Kaida
- Â Nurse / ... 2 episodes, 2003
- Ichirô Nagai
- Â Dr. Poppotore 2 episodes, 2003
- Mitsuaki Madono
- Â Announcer 2 episodes, 2003
- Sayaka Maeda
- Â Child / ... 2 episodes, 2003
- Yumi Tôma
- Â Kaaya / ... 2 episodes, 2004
- Masako Katsuki
- Â Rabia 2 episodes, 2004
- Mahito Tsujimura
- Â Donpa 2 episodes, 2004
- Keiji Hirai
- Â Attendant / ... 2 episodes, 2004
- Masaaki Ôkura
- Â Man A / ... 2 episodes, 2004
- Yuto Kazama
- Â Controller / ... 2 episodes, 2004
- Kiyonobu Suzuki
- Â Stalin 2 episodes, 2004
- Megumi Hayashibara
- Â Alien 1 episode, 2003
- Kôichi Yamadera
- Â Numata 1 episode, 2003
- Minami Takayama
- Â Shinichi 1 episode, 2003
- Ken'ichi Suzumura
- Â Yukio Nishino 1 episode, 2003
- Toshio Furukawa
- Â Neon Lights 1 episode, 2003
- Aki Sasaki
- Â Child 1 episode, 2003
- Chika Sakamoto
- Â Gunon 1 episode, 2003
- Yûko Miyamura
- Â Mimi 1 episode, 2003
- Bin Shimada
- Â Director 1 episode, 2003
- Ryûzaburô Ôtomo
- Â Gaff 1 episode, 2003
- Dennis Falt
- Â Narrator 1 episode, 2003
- Kinryû Arimoto
- Â Erika's Father 1 episode, 2003
- Yoshihisa Kawahara
- Â Bonbon 1 episode, 2003
- Michiko Neya
- Â Reiko 1 episode, 2003
- Masashi Ebara
- Â Archer 1 episode, 2003
- Hiroya Ishimaru
- Â Gustav 1 episode, 2003
- Mika Kanai
- Â Denkou 1 episode, 2003
- Yôko Sômi
- Â Tommy 1 episode, 2003
- Mayumi Izuka
- Â Lily 1 episode, 2003
- Seizô Katô
- Â Rommel 1 episode, 2003
- Takahiro Fujimoto
- Â Security Guard 1 episode, 2003
- Kazuhiro Nakata
- Â Leader 1 episode, 2003
- Masahiko Tanaka
- Â Erza Kane 1 episode, 2003
- Sachi Matsumoto
- Â Ken 1 episode, 2003
- Naomi Shindô
- Â Female Announcer 1 episode, 2003
- Yôsuke Akimoto
- Â Captain 1 episode, 2003
- Tarako
- Â Shiowamu 1 episode, 2003
- Miyoko Shôji
- Â Helen 1 episode, 2003
- Katsunosuke Hori
- Â Dr. Saruta 1 episode, 2003
- Shiho Kikuchi
- Â Tefe 1 episode, 2003
- Takuma Suzuki
- Â Minion 1 episode, 2003
- Junpei Takiguchi
- Â Mr. Darling 1 episode, 2003
- Marc Handler
- Â Jumbo 1 episode, 2003
- Tomoe Hanba
- Â Tatsuo Nishino 1 episode, 2003
- Sayuri
- Â Caster 1 episode, 2003
- Katsumi Toriumi
- Â Kusuko 1 episode, 2003
- Yûko Sasamoto
- Â Taku 1 episode, 2003
- Miyako Ito
- Â Marshmallow 1 episode, 2003
- Yukie Maeda
- Â Researcher 1 episode, 2003
- Hiroshi Ôtake
- Â Cookie 1 episode, 2003
- Akimitsu Takase
- Â Delta 1 episode, 2003
- Ryûji Saikachi
- Â Dr. Toneriko 1 episode, 2003
- Ruri Asano
- Â Street Announcer 1 episode, 2003
- Mai Katagiri
- Â Underclassman 1 episode, 2003
- Tomoko Naka
- Â Scientist 1 episode, 2003
- Yumi Hikita
- Â Madeleine 1 episode, 2003
- Ritsuo Sawa
- Â Dekopin 1 episode, 2003
- Risa Junna
- Â Erika Nishino 1 episode, 2003
- Tomohiro Nishimura
- Â Administrator 1 episode, 2003
- Kanako Omura
- Â Child 1 episode, 2003
- Jun Shikano
- Â Child 1 episode, 2003
- Jun Sato
- Â Security Guard 1 episode, 2003
- Emi Kimoto
- Â Child 1 episode, 2003
- Sunplaza Nakano
- Â Franken 1 episode, 2003
- Koro Ishizuka
- Â Underclassman 1 episode, 2003
- Akie Nakamura
- Â Child 1 episode, 2003
- Ryôko Numazawa
- Â Mother 1 episode, 2003
- Katsuhiro Kitagawa
- Â Manager 1 episode, 2003
- Masako Nozawa
- Â Caveman Boy 1 episode, 2004
- Kappei Yamaguchi
- Â Anton 1 episode, 2004
- Ikue Ôtani
- Â Nina 1 episode, 2004
- Jôji Nakata
- Â Emily's Dad 1 episode, 2004
- Unshô Ishizuka
- Â Marukabi Boon 1 episode, 2004
- Hiroaki Hirata
- Â Jake 1 episode, 2004
- Rica Matsumoto
- Â Rino 1 episode, 2004
- Naoya Uchida
- Â Nina's Father 1 episode, 2004
- Hikaru Midorikawa
- Â Sedo 1 episode, 2004
- Ryôtarô Okiayu
- Â Klaus 1 episode, 2004
- Ken'yû Horiuchi
- Â Captain Damon 1 episode, 2004
- Daisuke Kishio
- Â Jiro 1 episode, 2004
- Satsuki Yukino
- Â Emily 1 episode, 2004
- Yukana
- Â Roxanne 1 episode, 2004
- Hideyuki Umezu
- Â Alucard 1 episode, 2004
- Shunsuke Sakuya
- Â Burt 1 episode, 2004
- Tomomichi Nishimura
- Â Mayor Manny 1 episode, 2004
- Kujira
- Â Shopkeeper 1 episode, 2004
- Miki Itô
- Â Hosuke Sharaku 1 episode, 2004
- Shinji Kawada
- Â Yanma 1 episode, 2004
- Yûsaku Yara
- Â Hunter 1 episode, 2004
- Gorô Naya
- Â Dr. Sebastian 1 episode, 2004
- Mîna Tominaga
- Â Bear-chan 1 episode, 2004
- Masami Kikuchi
- Â Friend 1 episode, 2004
- Tomoyuki Shimura
- Â Ando 1 episode, 2004
- Mako Hyôdô
- Â Rock's Mother 1 episode, 2004
- Etsuko Kozakura
- Â Trill 1 episode, 2004
- Yurika Hino
- Â Dr. Cho Tanmen 1 episode, 2004
- Motomu Kiyokawa
- Â Gazette 1 episode, 2004
- Masaki Aizawa
- Â Dan 1 episode, 2004
- Yumi Takada
- Â Tiara 1 episode, 2004
- Shingo Katori
- Â Paint-painting Robot 1 episode, 2004
- Sakiko Tamagawa
- Â Nicole 1 episode, 2004
- Rokurô Naya
- Â Dr. Pavlos 1 episode, 2004
- Chiyako Shibahara
- Â Flight Announcement 1 episode, 2004
- Omi Minami
- Â Billy 1 episode, 2004
- Masayuki Omoro
- Â Cutter 1 episode, 2004
- Michael Shitanda
- Â Munk 1 episode, 2004
- Shin Aomori
- Â Dr. Bulda 1 episode, 2004
- Kumiko Izumi
- Â Kenichi's Mother 1 episode, 2004
- Masumi Kageyama
- Â Ichigaya 1 episode, 2004
- Kumi Yamakado
- Â Vice-Captain 1 episode, 2004
- Ken Shiroyama
- Â Kanda 1 episode, 2004
- Megumi
- Â Chiyoko Wato 1 episode, 2004
- Natsuki Yoshihara
- Â Teammate 1 episode, 2004
- Kanako Ogata
- Â Emily's Mom 1 episode, 2004
- Chigusa Ikeda
- Â Dobbin 1 episode, 2004
- Makoto Tezuka
- Â Friday 1 episode, 2004
- Akira Kajiwara
- Â Robot 1 episode, 2004
- Gou Yamane
- Â Operator 1 episode, 2004
- Yuu Urata
- Â Attendant 1 episode, 2004
- Mayumi Ichikawa
- Â Waitress Robot 1 episode, 2004
- Takehiro Murozono
- Â Manager 1 episode, 2004
- Nao Okada
- Â Hannah 1 episode, 2004
- Rena Mizushiro
- Â Teammate 1 episode, 2004
- Yuki Kyoi
- Â Caveman Mother 1 episode, 2004
- Candi Milo
- Â Astro Boy unknown episodes
- Wally Wingert
- Â Dr. O'Shay, Skunk, Blue Knight, Wally Kisagari, Katari, Harley, Kato, Additional Voices unknown episodes
- Bill Farmer
- Â Tawashi unknown episodes
- Susan Blu
- Â Zoran unknown episodes
- Dorian Harewood
- Â Tenma unknown episodes
- Maile Flanagan
- Â Matthew unknown episodes
- Lara Jill Miller
- Â Alejo, Additional Voices unknown episodes
- Greg Cipes
- Â Atlas unknown episodes
- Sandy Martin
- Â Abercrombie unknown episodes
- Faith Salie
- Â Yuko unknown episodes
- Gregg Berger
- Â Additional Voices unknown episodes
- Jennifer Darling
- Â Nora unknown episodes