- JB Blanc
- Â Joe 'Joker' Carpenter / ... 26 episodes, 2003-2004
- Siobhan Flynn
- Â Wendy Earhart 26 episodes, 2003-2004
- Rachel Hirschfeld
- Â Anita King 26 episodes, 2003-2004
- Hunter Mackenzie Austin
- Â Michelle Chan 26 episodes, 2003-2004
- Samantha Tabak
- Â Nenene Sumiregawa 26 episodes, 2003-2004
- Vesper Burnett
- Â Additional Voices 26 episodes, 2003-2004
- Sara Lahti
- Â Maggie Mui 26 episodes, 2003-2004
- Chiwa Saitô
- Â Anita King 25 episodes, 2003-2004
- Shoko Kikuchi
- Â Michelle Cheung 25 episodes, 2003-2004
- Erica Shaffer
- Â Cabin Attendant / ... 24 episodes, 2003-2004
- Hiromi Hirata
- Â Maggie Mui 23 episodes, 2003-2004
- Satsuki Yukino
- Â Nenene Sumiregawa 22 episodes, 2003-2004
- Jessica D. Stone
- Â Junior / ... 20 episodes, 2003-2004
- Mitsuki Saiga
- Â Junior 20 episodes, 2003-2004
- Hozumi Gôda
- Â 'Joker' Joe Carpenter 18 episodes, 2003-2004
- Mika Sakenobe
- Â Wendy Earhart 18 episodes, 2003-2004
- Hellena Taylor
- Â Yomiko Readman / ... 15 episodes, 2003-2004
- Rieko Miura
- Â Yomika 'The Paper' Readman 13 episodes, 2003-2004
- Shin'ichirô Miki
- Â Lee Lin-Ho 13 episodes, 2003
- Michiko Neya
- Â Nancy Makuhari 11 episodes, 2003-2004
- Doug Lee
- Â Drake 9 episodes, 2003-2004
- Masami Iwasaki
- Â Drake Anderson 9 episodes, 2003-2004
- Tomoya Kawai
- Â Alex 9 episodes, 2003-2004
- Taliesin Jaffe
- Â Ryuji Kitayama / ... 7 episodes, 2003
- Megan Taylor Harvey
- Â Hisami Hishiishi / ... 7 episodes, 2003-2004
- Brittney Lee Harvey
- Â Tohko Shigeno 7 episodes, 2003-2004
- Taeko Kawata
- Â Hisami Shiishi / ... 7 episodes, 2003-2004
- Ai Nonaka
- Â Touko Shigno / ... 6 episodes, 2003-2004
- Lauren Bendik
- Â Chiho Iwata 6 episodes, 2003-2004
- J-ray
- Â Natsume Nishizono 6 episodes, 2003-2004
- Steven Bendik
- Â Tohru Okahara 6 episodes, 2003-2004
- Shigeru Ushiyama
- Â Kim-san 6 episodes, 2003-2004
- Patrick Seitz
- Â Lee Linho 6 episodes, 2003
- Isshin Chiba
- Â Ryuji Kitayama / ... 5 episodes, 2003-2004
- John Snyder
- Â Sonny / ... 5 episodes, 2003
- Craig Robert Young
- Â Joker's Men 4 episodes, 2003-2004
- Takaya Kuroda
- Â Sunny Wong 4 episodes, 2003
- Tadahisa Saizen
- Â Storekeeper A / ... 4 episodes, 2003
- Dai Matsumoto
- Â Staff Member B / ... 4 episodes, 2003
- Maggie O'Rourke
- Â Reading Club President / ... 4 episodes, 2003
- Emmett James
- Â Mirror Man 3 episodes, 2003-2004
- Alison Lees-Taylor
- Â Marianne 3 episodes, 2003-2004
- Hideyuki Umezu
- Â President Cole 3 episodes, 2003-2004
- Ryoka Shima
- Â Chiho Iwata / ... 3 episodes, 2003-2004
- Yasuhiko Tokuyama
- Â Chief Experimenter 3 episodes, 2003
- Tarou Masuoka
- Â Staff Member A 3 episodes, 2003
- Yasuhiro
- Â Master / ... 2 episodes, 2003-2004
- Samuel Matisoff
- Â Boy A 2 episodes, 2003-2004
- Yukari Tamura
- Â Haruhi Nishizono / ... 2 episodes, 2003
- Carrie Savage
- Â Nancy Makuhari / ... 2 episodes, 2003
- Masayuki Katô
- Â Warning Voice 2 episodes, 2003
- Jirô Saitô
- Â Cafe Owner / ... 2 episodes, 2003
- Reiko Takagi
- Â Tohru Okahara 2 episodes, 2003
- Jonathan Klein
- Â Ryuji Kitayama / ... 2 episodes, 2003
- Zarah Little
- Â Cafe Staff / ... 2 episodes, 2003
- Arthur Russell
- Â Richard Southerland / ... 2 episodes, 2003
- Kiyomitsu Mizuuchi
- Â Assistant Chief Librarian / ... 2 episodes, 2003
- Takayasu Usui
- Â Newscaster / ... 2 episodes, 2003
- Hideto Ebihara
- Â Newscaster / ... 2 episodes, 2003
- John E. Breen
- Â Kim, Leader / ... 2 episodes, 2003
- Kathleen Gabriel
- Â Information Receptionist / ... 2 episodes, 2003
- Ben Takada
- Â Editor C / ... 2 episodes, 2003
- Eri Oono
- Â Information Receptionist / ... 2 episodes, 2003
- Ryôkichi Takahashi
- Â Storekeeper C 2 episodes, 2003
- Fumio Matsuoka
- Â Toto Books Owner 2 episodes, 2003
- Lance J. Holt
- Â Chief Experimenter 1 episode, 2003
- Jody Jaress
- Â Old Woman 1 episode, 2003
- Stephanie Sheh
- Â Haruhi Nishizono 1 episode, 2003
- Michelle Ruff
- Â Airport Staff 1 episode, 2003
- Daisuke Ono
- Â Editor-in-Chief 1 episode, 2003
- Kazuki Yao
- Â Weber 1 episode, 2003
- Naoya Uchida
- Â Mirror Man 1 episode, 2003
- Frederick Stuart
- Â Operator 1 episode, 2003
- Doug Stone
- Â Editor A 1 episode, 2003
- Nobuo Tobita
- Â Criminal A / ... 1 episode, 2003
- Hiroshi Naka
- Â Detective 1 episode, 2003
- Yuri Amano
- Â Harumi Mishima 1 episode, 2003
- Mai Kadowaki
- Â Girl B 1 episode, 2003
- Justin Gross
- Â Chief 1 episode, 2003
- Shinji Kawada
- Â Young Storekeeper 1 episode, 2003
- Masaharu Satô
- Â Irving 1 episode, 2003
- Sayaka Aoki
- Â Girl A 1 episode, 2003
- Ryô Naitô
- Â Frankie 1 episode, 2003
- Risa Hayamizu
- Â Cabin Attendant 1 episode, 2003
- Kae Araki
- Â Alice Alice Arquette 1 episode, 2003
- Takuma Suzuki
- Â Movie Company Employee 1 episode, 2003
- Mari Yokô
- Â Katharine Komuro 1 episode, 2003
- Osamu Hosoi
- Â John Smith 1 episode, 2003
- Eizô Tsuda
- Â Detective 1 episode, 2003
- Toshihide Tsuchiya
- Â Prime Minister 1 episode, 2003
- Masami Suzuki
- Â Nori Kawarazaki 1 episode, 2003
- Mahito Funaki
- Â Chief Researcher 1 episode, 2003
- Rie Ishizuka
- Â Reading Club President 1 episode, 2003
- Haruhi Terada
- Â Haruhi's Manager 1 episode, 2003
- Kanako Hattori
- Â Girl Student 1 episode, 2003
- Tetsuo Mizutori
- Â Old Man 1 episode, 2003
- Takkô Ishimori
- Â Principal Uchida 1 episode, 2003
- Sienna Benioff
- Â Nori Kawarazaki 1 episode, 2003
- Masayuki Nakata
- Â Chief 1 episode, 2003
- Mantarô Iwao
- Â Editor B 1 episode, 2003
- Ema Kogure
- Â Newscaster Uemura 1 episode, 2003
- Hidetoshi Ito
- Â Toastmaster 1 episode, 2003
- Shigeru Shibuya
- Â Operator 1 episode, 2003
- Nobuyuki Tanaka
- Â Young Detective 1 episode, 2003
- Yuka Inokuchi
- Â Airport Staff 1 episode, 2003
- Casey Masamitsu
- Â Girl B 1 episode, 2003
- Bryan Bitof
- Â Frankie 1 episode, 2003
- Youhei Oobayashi
- Â College Student 1 episode, 2003
- Megumi Nasu
- Â Aoi Nagai 1 episode, 2003
- Jessica Gordon
- Â Girl A 1 episode, 2003
- Michelle Field
- Â Girl Student 2 1 episode, 2003
- Matsuo Matsuo
- Â Richard Southerland 1 episode, 2003
- Ai Iura
- Â Marianne 1 episode, 2003
- Masato Nakata
- Â Chief 1 episode, 2003
- Soichiro Shibata
- Â Local Staff 1 episode, 2003
- Yûgo Takahashi
- Â Police Chief 1 1 episode, 2003
- Sachie Okada
- Â Police Woman 1 episode, 2003
- Akira Kosaka
- Â Boy A 1 episode, 2003
- Yuko Mogi
- Â Old Woman 1 episode, 2003
- Hiroaki Ishikawa
- Â Leader 1 episode, 2003
- Katsuyuki Konishi
- Â Chief American Soldier 1 episode, 2004
- Kishô Taniyama
- Â Staff 1 episode, 2004
- Eisuke Asakura
- Â Announcer 1 episode, 2004
- Ken'ichi Mochizuki
- Â Announcer Car 1 episode, 2004
- Masaru Motegi
- Â Staff 1 episode, 2004
- Liam O'Brien
- Â Criminal #1, Editior unknown episodes
- Sam Riegel
- Â Criminal #2, Cafe Owner, Young Owner unknown episodes
- William Morgan Sheppard
- Â Toto Books Owner unknown episodes
- Michael Forest
- Â Shop Owner B unknown episodes
- William Frederick Knight
- Â Shop Owner A unknown episodes
- Deem Bristow
- Â Old Man, Chief Researcher unknown episodes
- Tone Rodriguez
- Â Member A unknown episodes
- Eri Saito
- Â Announcer unknown episodes
- Hironori Miyata
- Â Storekeeper B unknown episodes
- Steve Weinstein
- Â Warning Voice unknown episodes
- Cheri LaBerry
- Â Announcer unknown episodes
- Mark Dos Santos
- Â Joker's Men (voice English Version uncredited) unknown episodes
- Matt Cadwallader
- Â Young Detective unknown episodes