The Simpsons/Thomas Parodies

Not all parodies are the same, but most of them are similar, like Homer as Thomas, Lenny as Percy, Marge as Emily and Mayor Quimby as Sir Topham Hatt. Here's a list:

Cast

 * Thomas = Homer/Lenny/Ned Flanders/Bart/Principal Skinner/Chief Wiggum/Ten Cents (from TUGS)/Sonic (from Sonic)/Mario (from Mario)/RS Mr. Conductor (from Shining Time Station)
 * Edward = Ned Flanders/Mr. Smithers/Reverend Lovejoy/Principal Skinner/Grandpa Abe/Hercules (from TUGS)/Uncle Chuck (from Sonic)/Luigi (from Mario)
 * Henry = Barney/Homer/Kirk Van Houten/Lenny/Carl/Principal Skinner
 * Gordon = Principal Skinner/Homer/Moe/Grandpa Abe/Bart/Barney Gumble/Superintendent Chalmers
 * James = Bart/Mr. Smithers/Moe/Lenny/Grandpa Abe/Milhouse/Homer/Principal Skinner (Nelson Muntz can't be James, Nelson Muntz is an antagonist, James is a protagonist)
 * Percy = Lenny/Milhouse/Bart/Carl/Homer/Todd Flanders/Kyle Broflovski (from South Park)
 * Toby = Grandpa Abe/The Music Teacher/Professor Frink/Reverend Lovejoy
 * Duck = Carl/Bart/Homer/Mr. Smithers/Rod Flanders
 * Donald = Groundskeeper Willie/Gravedigger Billy/Lenny/Carl
 * Douglas = Gravedigger Billy/Groundskeeper Willy/Carl/Lenny
 * Oliver = Chief Wiggum/Martin/Lenny
 * Diesel = Mr. Burns/Sideshow Bob/Fat Tony/Nelson/Superintendent Chalmers (Bart can't be Diesel, Bart is a protagonist, Diesel is an antagonist)
 * BoCo = Dr. Hibbert/Kent Brockman/Yes Guy/Homer/Principal Skinner
 * Daisy = Edna Krabappel/Marge/Lisa/Agnes Skinner/Sherri/Terri
 * Mavis = Launne Van Houten/Lisa/Marge/Helen Lovejoy
 * Emily = Marge/Lisa/Maude Flanders/Edna Krabappel
 * Rosie = Lisa/Marge/Maggie/Maude Flanders
 * Sir Topham Hatt = Mayor Quimby/Principal Skinner/Stan Marsh (from South Park)/Moe/Mario (from Mario)
 * Spencer = Superintendent Chalmers/Mayor Quimby/Moe/Mr. Burns/Fat Tony/Sideshow Bob (Bart can't be Spencer, Bart is a protagonist, Spencer is an antagonist)
 * Stepney = John/Mr. Smithers/Bart/Millhouse/Homer
 * Bertie = Sideshow Mel/Bart/Milhouse/Ned Flanders/Mr. Smithers/Puffa (from TUGS)
 * Salty = The Sea Captain
 * Fergus = Mr. Smithers
 * Skarloey = Lou/Rod Flanders
 * Rhenas = Eddie/Todd Flanders
 * Sir Handel = Moe
 * Peter Sam = Martin Prince
 * Rusty = Reverend Lovejoy
 * Duncan = Snake Jailbird/Nelson/Superintendent Chalmers
 * Diesel 10 = Sideshow Bob/Mr. Burns/Fat Tony/Nelson/Superintendent Chalmers
 * Murdoch = Herb/Principal Skinner/Mr. Smither/Grandpa Abe/Professor Frink/Reverend Lovejoy
 * Hank = Yes Guy/Homer/Apu/Herb/Principal Skinner
 * Molly = Maude Flanders/Launne Van Houten/Lisa/Marge