Once-Ler is my favorite character in this movie! :D

My fav. version: English, Czech, Danish, French Canadian, Hungarian, Korean, Norwegian, Polish and Russian, but rest is good too. :)

Artist:
English - Ed Helms
Arabic - ???
Bulgarian - Момчил Степанов (Momchil Stepanov)
Chinese (Can) - ???
Chinese (Man) - 蔣鐵城 (Jiǎngtiě Chéng)
Croatian - Filip Juričić
Czech - Viktor Dyk
Danish - Martin Greis
Dutch - René van Kooten.
Estonian - Sergo Vares
Finnish - Antti L. J. Pääkkönen
French - Donald Reignoux
French (Q) - Marc Labrèche
German - Tom Luca
Greek - Κωνσταντίνος Σταυρίδης (Konstandinos Stavridis)
Hebrew - גילן שחף (Gilan Shahaf).
Hindi - ???
Hungarian - Bereczki Zoltán
Italian - Marco Mengoni
Japanese - トータス松本 (Tortoise Matsumoto)
Korean - Kim Gyeong-Jun (a.k.a K JUN)
Norwegian - Benjamin Hlestad
Polish - Tomasz Steciuk
Portuguese Br. - Cláudio Galvan
Romanian - ???
Russian - Александр Гаврилин (Aleksandr Gavrilin)
Slovak - Martin Kaprálik
Slovene - Lado Bizovičar
Castilian - David Robles
Spanish (Latin) - Arturo Mercado Jr.
Swedish - Andreas Nilsson
Turkish - ???
Ukrainian - ???

Missing
Basque - ???
(???)
Catalan - ???
(   • Lorax - How bad can I be (Català)  )
Flemish - Frank Hoelen
(   • The Lorax - How Bad Can I Be? (Flemish)  )
Icelandic -???
(   • Video  )
Persian - ???
(   • The Lorax - How Bad Can I Be? (Persia...  )
Portuguese - Pedro Bargado
(   • Video  )
Lithuanian - Vainius Sodeika
(   • The Lorax - How Bad Can I Be? (Lithua...  )
Latvian - Ainārs Ančevskis
(   • The Lorax - How Bad Can I Be? (Latvian)  )
Thai - ???
(   • Video  )
Vietnamese - ???
(???)

(What version is missing too?)