Thomas/Fanboy and Chum Chum

Version 1

 * Thomas as Fanboy (Thomas and Fanboy are both Main Heroes) (Fanboy's Voice Suits Thomas The Blue Tank Engine)
 * Percy as Chum Chum (Percy and Chum Chum are both Best Friends To Thomas and Fanboy) (Chum Chum's Voice Suits Percy The Small Green Tank Engine)
 * Emily as Yo (Emily and Yo are both Happy, Cheerful, Sweet, Kind, Gentle and Beautiful) (Yo's Voice Suits Emily The Beautiful Emerald Sterling Tender Engine)
 * James as Kyle The Conjurer (James and Kyle The Conjurer are both Vain) (Kyle The Conjurer's Voice Suits James The Red Tender Engine)
 * Diesel as Sigmund The Sorcerer (Devious Diesel and Sigmund The Sorcerer are both Wearing Black) (Sigmund The Sorcerer's Voice Suits Devious Diesel)
 * Henry as Ozvald "Oz" Harmonian
 * Diesel 10 as Boog
 * Boco as Lenny
 * Gordon as Hank Mufflin
 * Elizabeth as Mrs. Bingle
 * Harvey as Yum Yum
 * Bertie as Dollar-Nator
 * Cranky as Stinky Pink Pool
 * Jeremy as Man-Arctica
 * Edward as Agent Johnson
 * Toby as Fedora Man
 * Salty as Fankylechum
 * Dennis as Chris Chuggy
 * George as Scriveneer Elf
 * Mavis as Nancy Pancy
 * Lady as Lupe
 * Rosie as Girl
 * Molly as Cher Leader
 * Flora as Lillie Lotus
 * Daisy as Francine
 * Caroline as Marsha
 * Duke as Duke (Both share the same name)
 * Fergus as Creech
 * Duncan as Necronomicon
 * Spencer as The Global Warmer
 * Madge as Oz's Mom
 * Bulgy as Professor Flan
 * Max as Brizwald
 * Jack as Berry the Ice Monster
 * Duck as Michael Johnson
 * The Spiteful Breakvan as Wally the Great
 * Sir Topham Hatt as Cecil the Magic Club President
 * D261 as Roland
 * Scruffey as Jimbo the Juggler
 * Bulstrode as Janitor Russ Poopatine
 * Stepney as Muk Muk

Version 2

 * Thomas as Fanboy (Thomas and Fanboy are both The Main Heroes) (Fanboy's Voice Suits Thomas The Blue Tank Engine)
 * Percy as Chum Chum (Percy and Chum Chum are both Sidekicks To Thomas and Fanboy) (Chum Chum's Voice Suits Percy The Green Tank Engine)
 * Emily as Yo (Emily and Yo are both Kind, Gentle, Friendly, Cheerful and Beautiful) (Yo's Voice Suits Emily The Beautiful Emerald Sterling Engine)
 * James as Kyle The Conjurer (James and Kyle The Conjurer are both Vain) (Kyle The Conjurer's Voice Suits James The Red Engine)
 * Diesel as Sigmund The Sorcerer (Devious Diesel and Sigmund The Sorcerer are both Wearing Black) (Sigmund The Sorcerer's Voice Suits Devious Diesel)
 * Molly as Lupe
 * Mavis as Nancy Pancy
 * Isobella as Cher Leader
 * Lady as Lillie Lotus
 * Rosie as Muk Muk
 * Daisy as Francine
 * Duck as Michael Johnson
 * Oliver as Duke
 * Salty as Fankylechum
 * Edward as Oz
 * Gordon as Hank Mufflin
 * Boco as Lenny
 * Bulgy as Boog
 * Elizabeth as Lunch Lady Cram
 * Diesel 10 as Janitor Poopatine
 * Duke as Necronomicon