The Fairly OddParents/Peanuts

Version 1

 * Timmy Turner as Charlie Brown (They are both the main character and are accident prone.)
 * AJ as Linus
 * Chester as Schroeder (They both end with "er" and have blonde hair.)
 * Sparky as Snoopy
 * Sanjay as Franklin (They both have dark skin.)
 * Vicky as Lucy
 * Tootie as Sally
 * Poof as Rerun

Version 2

 * Chester as Charlie Brown (They both begin with "Ch".)
 * AJ as Franklin (Their both african american.)
 * Timmy Turner as Linus (They both have brown hair.)
 * Sanjay as Schroeder (They both start with "S".)
 * Wanda as Sally (Their both naggy.)
 * Cosmo as Pig Pen
 * Sparky as Snoopy

Version 3

 * Timmy Turner as Charlie Brown (They are both the main character and are accident prone.)
 * AJ as Franklin (Their both african american.)
 * Chester as Pig Pen (They both like getting dirty.)
 * Wanda as Sally (Their both naggy.)
 * Cosmo as 5
 * Vicky as Lucy
 * Tootie and Trixie as 3 and 4
 * Sparky as Snoopy