The Fairly OddParents/Fanboy and Chum Chum

Cast
Version 1 Version 2 Version 3 Version 4
 * Cosmo as Fanboy (Cosmo and Fanboy are both green)
 * Timmy Turner as Chum Chum (Timmy and Chum Chum both have brown hair)
 * Wanda as Yo (Wanda and Yo are both Pink)
 * Winston Dunsworth as Kyle Bloodworth-Thomason
 * Remy Buxaplenty as Sigmund The Sorcerer (Remy Buxaplenty and Sigmund The Sorcerer are both Rich and Snobbish Children)
 * Tootie as Lupe (Tootie and Lupe both have black hair)
 * Veronica as Cher Leader
 * AJ as Oz
 * AJ's Mom as Oz's Mom
 * Trixie Tang as Francine (Trixie and Francine both have "r" and "i" in the middle of their names)
 * Vicky as Marsha (Vicky and Marsha are both considered morbid)
 * Francis as Boog
 * Mr. Crocker as The Global Warmer
 * Chloe Carmichael as Nancy Pancy
 * Mr Turner as Hank Mufflin
 * Mrs Turner as Madame LaVache/Mrs Olive
 * Chester as Duke
 * Elmer as Chris Chuggy
 * Francis as Boog (Francis & Boog are both bullies)
 * Sanjay as Lenny (both wear glasses)
 * Lunch Lady as Lunch Lady Cram
 * Jorgen as Agent 8
 * Timmy Turner as Fanboy
 * Chester McBadbat as Chum Chum (both names with a c & an h with their names)
 * Tootie as Yo (both have black hair in pigtails)
 * Veronica as Nancy Pancy
 * AJ as Kyle Bloodworth-Thompson
 * Cosmo as Hank Mufflin
 * Wanda as Madame LaVache/Mrs Olive
 * Chloe Carmichael as Francine (both end with e)
 * Mr Crocker as Russ Poopatine
 * Francis as Boog
 * AJ's Dad as Sigmund The Soccer
 * Chester's Dad as Oz
 * Elmer as Duke
 * Vicky as Marsha
 * Carly as Cher Leader
 * Timmy's Parents as Fanboy & Chum Chum's Parents
 * Lunch Lady as Lunch Lady Cram
 * Trixie Tang as Lupe
 * Jorgen as Agent 8
 * Mr Turner as Fanboy
 * Timmy Turner as Chum Chum
 * Mrs Turner as Yo
 * Cosmo as Hank Mufflin
 * Wanda as Madame LaVache/Mrs Olive
 * Sheldon as Kyle Bloodworth-Thompson
 * Chloe Carmichael as Nancy Pancy
 * Lunch Lady as Lunch Lady Cram (both female lunch ladies)
 * Mr Crocker as Janitor Russ Poopatine
 * Vicky as Marsha
 * Carly as Lupe
 * Francis as Boog
 * AJ as Oz
 * Chester McBadbat as Michael Johnson
 * Crimson Chin as Man-Arctica
 * Jorgen as Agent 8
 * Chester McBadbat as Fanboy (Chester & Fanboy are both wearing green)
 * Timmy Turner as Chum Chum (Timmy & Chum Chum both have her hair color brown)
 * Chloe Carmichael as Yo
 * Wanda as Lupe (Wanda & Lupe both wear pink)
 * Tootie as Nancy Pancy (both wear glasses)
 * Trixie Tang as Cher Leader
 * Veronica as Francine (both have 8 letters in their names)
 * Francis as Kyle Bloodworth-Thompson
 * Francis's Leader as Sigmund The Soccer
 * Cosmo as Chris Chuggy (both start with c)
 * AJ as Michael Johnson
 * Sanjay as Duke
 * Mr Turner as Hank Mufflin
 * Mrs Turner as Madame LaVache/Mrs Olive
 * Mr Crocker as The Global Warmer
 * Vicky as Marsha
 * Bouncer as Boog (both are strong & start with b and o)