- Molly C. Quinn
- Â Bloom / ... 110 episodes, 2011-2015
- Keke Palmer
- Â Aisha 110 episodes, 2011-2015
- Amy Gross
- Â Stella / ... 110 episodes, 2011-2015
- Morgan Decker
- Â Tecna / ... 110 episodes, 2011-2015
- Hiromi Dames
- Â Musa / ... 110 episodes, 2011-2015
- Alejandra Reynoso
- Â Flora / ... 110 episodes, 2011-2015
- Sam Riegel
- Â Riven / ... 110 episodes, 2011-2015
- Matt Shively
- Â Sky 109 episodes, 2011-2015
- Adam Gregory
- Â Brandon 109 episodes, 2011-2015
- Charlie Schlatter
- Â Timmy / ... 109 episodes, 2011-2015
- David Faustino
- Â Helia 109 episodes, 2011-2015
- Larisa Oleynik
- Â Icy / ... 109 episodes, 2011-2015
- Jennifer Cody
- Â Darcy 109 episodes, 2011-2015
- Kimberly Brooks
- Â Stormy / ... 109 episodes, 2011-2015
- Dee Bradley Baker
- Â Kiko / ... 108 episodes, 2011-2015
- Kari Wahlgren
- Â Narrator / ... 108 episodes, 2011-2015
- Letizia Ciampa
- Â Bloom / ... 108 episodes, 2004-2019
- Mirko Mazzanti
- Â Riven 108 episodes, 2004-2019
- Alessandro Quarta
- Â Sky 107 episodes, 2004-2019
- Gemma Donati
- Â Musa / ... 106 episodes, 2004-2019
- Domitilla D'Amico
- Â Tecna / ... 106 episodes, 2004-2019
- Perla Liberatori
- Â Stella / ... 106 episodes, 2004-2019
- Corrado Conforti
- Â Timmy 106 episodes, 2004-2019
- Suzy Myers Jackson
- Â Stormy / ... 104 episodes, 2004-2015
- Holly Gauthier-Frankel
- Â Flora / ... 104 episodes, 2004-2012
- Daniel Brochu
- Â Brandon 104 episodes, 2004-2012
- Michael Yarmush
- Â Timmy 104 episodes, 2004-2012
- Jennifer Seguin
- Â Stella 104 episodes, 2004-2012
- Mark Hauser
- Â Sky 104 episodes, 2004-2012
- Mitchell David Rothpan
- Â Riven 104 episodes, 2004-2012
- Roberta Greganti
- Â Faragonda 92 episodes, 2004-2015
- Laura Lenghi
- Â Aisha / ... 80 episodes, 2005-2019
- Massimiliano Alto
- Â Brandon 80 episodes, 2004-2012
- Lisa Ortiz
- Â Musa / ... 79 episodes, 2004-2019
- Dan Green
- Â Sky 78 episodes, 2004-2011
- Sebastian Arcelus
- Â Timmy / ... 78 episodes, 2004-2011
- Rachael Lillis
- Â Faragonda / ... 78 episodes, 2004-2011
- Eleanor Noble
- Â Icy 78 episodes, 2004-2011
- Michael Sinterniklaas
- Â Riven 78 episodes, 2004-2011
- Kerry Williams
- Â Flora / ... 78 episodes, 2004-2011
- Liza Jacqueline
- Â Bloom 78 episodes, 2004-2011
- Helena Evangeliou
- Â Bloom 78 episodes, 2004-2011
- Carrie Finlay
- Â Darcy 78 episodes, 2004-2011
- Caren Manuel
- Â Stella / ... 78 episodes, 2004-2011
- Valeria Vidali
- Â Stormy 78 episodes, 2004-2011
- Sarah McCullough
- Â Musa / ... 78 episodes, 2004-2011
- Tatiana Dessi
- Â Icy 78 episodes, 2004-2011
- Federica De Bortoli
- Â Darcy 78 episodes, 2004-2011
- Lucinda Davis
- Â Aisha / ... 78 episodes, 2005-2012
- Martin Watier
- Â Helia 78 episodes, 2005-2012
- Rebecca Soler
- Â Stella / ... 78 episodes, 2011-2019
- Maria Jose Estevez
- Â Musa 78 episodes, 2012-2015
- Gregory Abbey
- Â Brandon 68 episodes, 2004-2011
- Debora Magnaghi
- Â Roxy 60 episodes, 2012-2015
- Ivanna Ochoa
- Â Flora 60 episodes, 2012-2015
- Dani Schaffel
- Â Tecna 52 episodes, 2004-2005
- Lezlie Karls
- Â Tecna / ... 52 episodes, 2004-2005
- Vasthy Mompoint
- Â Aisha 52 episodes, 2005-2011
- Francesco Pezzulli
- Â Helia 52 episodes, 2005-2011
- Jodie Resther
- Â Tecna 52 episodes, 2011-2012
- Melanie Henriquez
- Â Bloom 52 episodes, 2012-2013
- Yasmil Lopez
- Â Tecna 52 episodes, 2012-2013
- Saskia Maarleveld
- Â Tecna / ... 52 episodes, 2015-2019
- Elizabeth Gillies
- Â Daphne / ... 47 episodes, 2005-2015
- Josh Keaton
- Â Valtor / ... 42 episodes, 2011-2013
- Marc Thompson
- Â Brafilius / ... 42 episodes, 2004-2019
- April Stewart
- Â Vanessa / ... 41 episodes, 2011-2015
- Erica Schroeder
- Â Faragonda / ... 39 episodes, 2004-2019
- Mayela Perez
- Â Selina / ... 34 episodes, 2013-2015
- Jessica DiCicco
- Â Selina / ... 33 episodes, 2005-2015
- Liliana Mumy
- Â Roxy 32 episodes, 2012-2014
- Harry Standjofski
- Â Darkar 30 episodes, 2005-2011
- Gianluca Crisafi
- Â Sky / ... 30 episodes, 2012-2019
- Alyson Leigh Rosenfeld
- Â Musa / ... 29 episodes, 2015-2019
- Wayne Grayson
- Â Timmy / ... 28 episodes, 2005-2019
- Fabrizio Temperini
- Â Darkar 28 episodes, 2005-2013
- Leonardo Graziano
- Â Helia 28 episodes, 2012-2019
- Sacha De Toni
- Â Nabu 27 episodes, 2011-2012
- Billy Bob Thompson
- Â Sky / ... 27 episodes, 2015-2019
- Jake Paque
- Â Brandon 27 episodes, 2015-2019
- Stefano Crescentini
- Â Avalon 26 episodes, 2005
- Sean Schemmel
- Â Valtor 26 episodes, 2011
- Cedric Kühle
- Â Valtor 26 episodes, 2011
- Adam Wylie
- Â Tritannus 26 episodes, 2012-2013
- Mark Camacho
- Â Gantlos 26 episodes, 2012
- Angela Galuppo
- Â Bloom 26 episodes, 2012
- Anik Matern
- Â Musa 26 episodes, 2012
- Terrence Scammell
- Â Ogron 26 episodes, 2012
- Thor Bishopric
- Â Anagan 26 episodes, 2012
- Sara Camacho
- Â Roxy 26 episodes, 2012
- Simon Peacock
- Â Duman 26 episodes, 2012
- Andrea Lavagnino
- Â Anagan 26 episodes, 2012
- Lidia Abautt
- Â Aisha 26 episodes, 2012
- Davide Lepore
- Â Duman 26 episodes, 2012
- Patrizio Prata
- Â Ogron 26 episodes, 2012
- Todd Fennell
- Â Nabu 26 episodes, 2012
- Alysha Deslorieux
- Â Aisha / ... 26 episodes, 2015
- Eileen Stevens
- Â Flora / ... 26 episodes, 2015
- Kate Bristol
- Â Musa 26 episodes, 2015
- Carlo Scipioni
- Â Brafilius 26 episodes, 2015
- Emilia Costa
- Â Kalshara 26 episodes, 2015
- Emily Cramer
- Â Bloom 26 episodes, 2019
- Brittany Pressley
- Â Flora 26 episodes, 2019
- Elinor Vanderburg
- Â Aisha 26 episodes, 2019
- Sarah Camacho
- Â Roxy 25 episodes, 2012
- Will Blagrove
- Â Nabu 24 episodes, 2011-2012
- Jason Griffith
- Â Lord Darkar 23 episodes, 2005
- Lara Jill Miller
- Â Tune / ... 22 episodes, 2005-2012
- Georgie Kidder
- Â Digit / ... 21 episodes, 2005-2012
- Michal Friedman
- Â Tune 21 episodes, 2005-2011
- Andi Whaley
- Â Lockette 21 episodes, 2005-2011
- Bryton James
- Â Roy 21 episodes, 2012-2014
- Hynden Walch
- Â Lockette, Amore / ... 20 episodes, 2005-2012
- Marc Diraison
- Â Helia 18 episodes, 2005-2011
- Susanne Blakeslee
- Â Griselda / ... 17 episodes, 2011-2014
- Carol Jacobanis
- Â Ms. Griffin 16 episodes, 2004-2005
- Grey Griffin
- Â Tecna's Guardian of Sirenix / ... 16 episodes, 2011-2014
- Laura Bailey
- Â Tressa / ... 16 episodes, 2011-2013
- Stoney Emshwiller
- Â King Erendor / ... 14 episodes, 2011-2013
- Ariana Grande
- Â Princess Diaspro 13 episodes, 2011-2013
- Natalie Lander
- Â Lithia / ... 13 episodes, 2011-2013
- Barbara De Bortoli
- Â Vanessa 12 episodes, 2004-2014
- Roberto Certomà
- Â Mike 12 episodes, 2004-2014
- Ludovica Marineo
- Â Ofelia / ... 12 episodes, 2004-2011
- Alessia La Monica
- Â Amentia / ... 12 episodes, 2004-2011
- Lauren Weisman
- Â Illiris 12 episodes, 2012-2013
- Franca Lumachi
- Â Griselda 11 episodes, 2004-2013
- Hope Levy
- Â Sonna 11 episodes, 2012-2013
- Haven Burton Paschall
- Â Bloom / ... 11 episodes, 2015
- Raffaella Castelli
- Â Daphne 10 episodes, 2004-2012
- Mitchell Whitfield
- Â Professor Palladium / ... 10 episodes, 2011-2014
- Obba Babatundé
- Â King Teredor 10 episodes, 2011-2013
- Yuri Lowenthal
- Â Ogron 9 episodes, 2012
- Tara Strong
- Â Stella's Guardian of Sirenix / ... 9 episodes, 2012-2013
- Will Friedle
- Â Nereus / ... 9 episodes, 2012-2013
- Amber Hood
- Â Desiryee 9 episodes, 2012-2013
- Bumper Robinson
- Â Gantlos 8 episodes, 2012
- Monica Vulcano
- Â Mitzi 8 episodes, 2004-2013
- Dave B. Mitchell
- Â Codatorta / ... 8 episodes, 2005-2013
- Cymphonique Miller
- Â Krystal / ... 8 episodes, 2012-2013
- Justin Prentice
- Â Andy / ... 8 episodes, 2012
- Mino Caprio
- Â Wizgiz 7 episodes, 2004-2013
- Veronica Taylor
- Â Diaspro / ... 7 episodes, 2004-2011
- Kayzie Rogers
- Â Vanessa 7 episodes, 2004-2011
- Rachael MacFarlane
- Â Chimera 7 episodes, 2011-2012
- James Patrick Stuart
- Â Mike 7 episodes, 2012-2013
- André Sogliuzzo
- Â Radius / ... 7 episodes, 2012-2013
- Cassandra Lee Morris
- Â Chimera / ... 6 episodes, 2011-2014
- Kath Soucie
- Â Countess Cassandra 6 episodes, 2011-2012
- Daniella Monet
- Â Mitzi 6 episodes, 2012
- Karen Strassman
- Â Nebula 6 episodes, 2012
- Valentina Mari
- Â Nebula 6 episodes, 2012
- Megan Cavanagh
- Â Luna 6 episodes, 2012-2013
- Laraine Newman
- Â Barbatea / ... 5 episodes, 2011-2013
- Keythe Farley
- Â King Neptune / ... 5 episodes, 2012-2013
- Alessandra Cassioli
- Â Morgana 5 episodes, 2012
- Lucio Saccone
- Â Sfoglia 4 episodes, 2004-2013
- Stuart Zagnit
- Â Mike 4 episodes, 2004
- Francesca Draghetti
- Â Cassandra 4 episodes, 2011
- Rachele Paolelli
- Â Griselda / ... 4 episodes, 2012-2019
- Darcy Rose Byrnes
- Â Elena 4 episodes, 2012
- Sirena Irwin
- Â Sibylla 4 episodes, 2012
- Daniela Abbruzzese
- Â Dorana 3 episodes, 2012-2019
- Melissa Greenspan
- Â Darma 3 episodes, 2012
- Mimi Torres
- Â Aurora / ... 3 episodes, 2012
- Angela Brusa
- Â Aurora 3 episodes, 2012
- Kathryn Cahill
- Â Mavilla 3 episodes, 2015
- Mary O'Brady
- Â Mavilla 3 episodes, 2015
- Mindy Sterling
- Â Morgana 2 episodes, 2012
- Jennifer Hale
- Â Galatea 2 episodes, 2011
- Francesca Manicone
- Â Galatea 2 episodes, 2011
- Sugar Lyn Beard
- Â Nissa 2 episodes, 2012
- Jim Ward
- Â Ho-Boe 2 episodes, 2013
- Candi Milo
- Â Queen Samara 2 episodes, 2013
- Meredith Zeitlin
- Â Stormy 2 episodes, 2015-2019
- Abe Goldfarb
- Â Orlando 2 episodes, 2015
- Henry F. Benjamin
- Â Valtor 2 episodes, 2019
- Daniele Raffaeli
- Â Nex 2 episodes, 2019
- Paolo De Santis
- Â Obscurum 2 episodes, 2019
- Cait Powers-Page
- Â Asteria / ... 2 episodes, 2019
- Giulia Tarquini
- Â Twinkly 2 episodes, 2019
- Leslie Kempa
- Â Dorana 2 episodes, 2019
- Massimiliano Plinio
- Â Freddy Krueger 1 episode, 2005
- Sam Cohen
- Â Buddy 1 episode, 2011
- Antonella Rinaldi
- Â Ligea 1 episode, 2011
- Soraya Butler
- Â Queen Niobe 1 episode, 2011
- Benedetta Gravina
- Â Miele 1 episode, 2011
- Alberta Viti
- Â Tressa 1 episode, 2011
- Rene Auberjonois
- Â Saladin 1 episode, 2012
- Nika Futterman
- Â Omnia 1 episode, 2012
- Maxim Knight
- Â Max 1 episode, 2012
- Isabella Murad
- Â Chelsea 1 episode, 2012
- Michael Donovan
- Â Rick 1 episode, 2012
- Saige Ryan
- Â Alice 1 episode, 2012
- Lynn Milgrim
- Â The Ancestral Spirit of Nature 1 episode, 2012
- Rachel Robinson
- Â Politea 1 episode, 2013
- Kyle Bode
- Â David 1 episode, 2012
- Mike Liscio
- Â Helia 1 episode, 2019
- Lori Gardner
- Â Darcy 1 episode, 2019
- Ivan Andreani
- Â Kiko 1 episode, 2019
- Giò Giò Rapattoni
- Â Faragonda 1 episode, 2019
- Alessandro Quarta
- Â Sky 1 episode, 2019
- Jesse Manocherian
- Â Riven 1 episode, 2019
- Stefano Onofri
- Â Palladium / ... 1 episode, 2019
- Guido Di Naccio
- Â Valtor 1 episode, 2019