Cast[]
- Thomas as Harry Potter (Thomas and Harry Potter are both the main heroes)
- Percy as Ron Weasley (Thomas and Percy are best friends, just like Harry Potter and Ron Weasley are)
- Emily as Hermione Granger (Emily and Hermione Granger are both the main females)
- Edward as Professor Albus Dumbledore (Edward and Professor Albus Dumbledore are both old, wise, and kind)
- Belle as Professor Minerva McGonagall (Belle and Professor Minerva McGonagall are both beautiful)
- Duncan as Mr. Argus Flich (Duncan and Mr. Argus Flich are both stubborn)
- Spencer as Professor Severus Snape (Spencer and Professor Severus Snape are both half bad and half good)
- Rainbow Brite (from The Three Caballeros/Casey Jr. and Friends) as Lavender Brown
- Tillie (from The Little Engine That Could/Casey Jr. and Friends) as Ginny Weasley (Tillie and Ginny Weasley are both beautiful)
- The Spiteful Breakvan as The Snake (Sorcerer's Stone)
- Bulgy as The Cobra (Chamber of Secrets)
- Diesel 10 as Basilisk (Chamber of Secrets) (Basilisk's voice suits Diesel 10)
- Gordon as Rubeus Hagrid (Gordon and Rubeus Hagrid are both big and strong)
- Henry as Sirius Black (Henry and Sirius Black are both wise and kind)
- Toby as Cornelius Fudge (Toby and Cornelius Fudge are both old)
- James as Bill Weasley (James and Bill Weasley are both vain)
- Donald and Douglas as Fred and George Weasley (Donald and Douglas are twins, just like Fred and George Weasley are)
- Duck as Seamus Finnigan (Duck and Seamus Finnigan are both western)
- Oliver as Oliver Wood (Oliver and Oliver Wood are both share the same names)
- Dennis as Dean Thomas (Dennis and Dean Thomas are both have the same word 'de' at the beginning of their names)
- Harold as Viktor Krum (Viktor Krum's voice suits Harold)
- Arthur as Arthur Weasley (Arthur and Arthur Weasley are both share the same names)
- Molly as Molly Weasley (Molly and Molly Weasley are both share the same names)
- Neville as Professor Neville Longbottom (Neville and Professor Neville Longbottom are both share the same names)
- Lady as Cho Chang (Cho Chang's voice suits Lady)
- Hector as Kreacher (Hector and Kracher are both have 3 letters in one name like the letter 'E' in the middle, 'C' in the middle and the same letter 'R' at the end of their names)
- Mavis as Fleur Delacour (Fleur Delacour's voice suits Mavis)
- Annie and Clarabel as Padma and Parvati Patil (Annie and Clarabel are twins, just like Padma and Parvati Patil are)
- BoCo as Remus Lupin (Remus Lupin's voice suits BoCo)
- Tootle (from Little Golden Book Land/Casey Jr. and Friends) as Horace Slughorn
- Georgia (from The Little Engine That Could/Casey Jr. and Friends) as Lily J. Potter
- Alfred (from Porky's Railroad/Casey Jr. and Friends) as James Potter
- Casey Jr. (from Disney's Dumbo/Casey Jr. and Friends) as Ernest Macmillan (Thomas and Casey Jr. are great friends, just like Harry Potter and Ernest Macmillan are)
- Emma (from Jim Button/Casey Jr. and Friends) as Hannah Abbott (Emma and Hannah Abbott are both have all the 2 letters, Emma has 2 letter 'Ms' and Hannah Abbott has 2 letter 'Ns', 2 Letter 'Bs' and 2 Letter 'Ts')
- Nermal (from Garfield) as Mrs. Norris
- S.C.Ruffey as Fluffy
- Devious Diesel as Draco Malfoy (Devious Diesel and Draco Malfoy are both devious and named begins with the letter 'D')
- Bill and Ben as Colin and Dennis Creevey (Bill and Ben are twins, just like Colin and Dennis Creevey are)
- Toyland Express (from Babes in Toyland/Casey Jr. and Friends) as Alastor "Mad-Eye" Moody
- Jason (from Back of the Knodilike/Casey Jr. and Friends) as Kingsley Shacklebolt
- Mellisa (from Porky's Railroad/Casey Jr. and Friends) as Nymphadora Tonks (Mellisa and Nymphadora Tonks are both wear pink)
- Pinknose (a fan-made Thomas character) as Professor Dolores Jane Umbridge (Pinknose and Professor Dolores Jane Umbridge are both evil and wear pink)
- Pearl (from TUGS) as Madame Poppy Pomfrey
- Johnny (from The Brave Engineer/Casey Jr. and Friends) as Professor Filius Flitwick
- Farnsworth (from The Little Engine That Could/Casey Jr. and Friends) as Professor Gildory Lockhart
- Montana (from Play Safe/Casey Jr. and Friends) as Cedric Diggory (Montana and Cedric Diggory are both powerful)
- Pufle (from Steam Train/Casey Jr. and Friends) as Nigel Wolpert
- 16 (from RWS) as Peter Pettigrew/Wormtail
- Sunshine (from TUGS) as Michael the Little Boy
- Arry and Bert as Vincent Crabbe and Gregory Goyle (Arry and Bert are twins, just like Vincent Crabbe and Gregory Goyle are)
- George as Lucius Malfoy (George and Lucius Malfoy are both evil and mean)
- Elizabeth as Narcissa Malfoy (Elizabeth and Narcissa Malfoy are both wives to George and Lucius Malfoy)
- Top Hat (from TUGS) as Percy Weasley (Top Hat and Percy Weasley are both vain)
- Cerberus (from The Little Engine That Could '2011 Film') as Lord Voldemort (Cerberus and Lord Voldemort are both the main villains)
- Toad as Dobby (Toad and Dobby are both small and have the same letter 'O' in the middle of their names)
- Patrick as Professor Quirinus Quirrell (Professor Quirinus Quirrell's voice suits Patrick)
- D261 as Vernon Dursley (Vernon Dursley's voice suits D261)
- Daisy as Petunia Dursley (Daisy and Petunia Dursley are both wear green, mean, and horrid)
- Smudger as Dudley Dursley (Smudger and Dudley Dursley are both evil and mean to Thomas and Harry Potter)
- Rustee Rails (from Rustee Rails Rides Again/Casey Jr. and Friends) as The Guard
- City of Truro as Cormac McLaggen (City of Truro and Cormac McLaggen are both named begins with the letter 'C')
- Greendale Rocket (from PP/Casey Jr. and Friends) as Albus Severus Potter
- Ivor (from Ivor the Engine/Casey Jr. and Friends) as Mr. Garrick Ollivander
- Silver Fish (from Porky's Railroad/Casey Jr. and Friends) as Bartemius Crouch Jr.
- Tracy (from The Little Engine That Could '2011 Film') as Pansy Parkinson
- Judge Judy (made up diesel engine) as Bellatrix Lestrange
- Emily (from Theodore Tugboat) as Moaning Myrtle
- Marge (made up narrow gauge engine) as Gabrielle Deacour
- Emalina (from JD41796) as Susan Bones
- Pete (from The Little Engine That Could/Casey Jr. and Friends) as Xenophilius Lovegood
- Sir Reginald (from Madeline/Casey Jr. and Friends) as Igor Karkaroff
- Flora as Luna Lovegood (Flora and Luna Lovegood are both wear yellow)
- Troublesome Trucks as Giants, Centarus, Death Eathers, Acromantulas, and Snatchers
- The Chinese Dragon as Hungarian Horntail
- Harry Hogwarts as Himself