Thomas the Tank Engine (Sharon Miller era and All Engines Go!)

Thomas the Tank Engine is an anthropomorphic E2 Billington class tank engine who is the titular protagonist of British TV series, Thomas & Friends. During seasons 12 through 16, he has become badly butchered to the point he is excessively unlikable and useless, especially in most of the episodes from those same seasons. During seasons 13 - 16, he was voiced by Ben Small and Martin Sherman in the UK and US respectively.

Bad Qualities
NOTE: This will only focus on how he was butchered badly in Season 12-16.
 * 1) The mistakes he makes in these five seasons show how he is portrayed as a bad tank engine in the following:
 * 2) * In "Splish, Splash, Splosh!", he got too carried away about playing with muddy water to the extent he sprays James, Emily, and Charlie for no reason other than just him screwing around. Therefore, his wheels would've rusted. Which proves the point his mischievous in it's complete worst in that episode.
 * 3) * In "Misty Island Rescue", aside from being a know-it-all who he thinks he is in the right. He makes bad decisions despite saying he makes good ones, ignores the Logging Locos when they need oil to build up steam, does not care about the common sense he is given, and says a lot of awful rhymes.
 * 4) * In "Saved You!" (the episode that began his loss of his original personality), Thomas wants to make himself a "hero" after being given the opportunity to take a fireman that rescued Lady Hatt's cat from a tree to Maithwaite for his own medal ceremony, when yet he completely messes everything up and has wasted everyone's time for his own idiocy.
 * 5) *In "Wonky Whistle", he causes havoc with a wonky whistle by leaving the Sodor Steamworks by nearly injuring (or killing) a workman who was trying to fit the whistle on him by his ladder, does nothing about the animals that are escaping out of his van due to his wonky whistle until the very last minute, and before leaving with the van at the station, he nearly grabbed a man's hand off the handle while he was trying to close the trailer van's door! Thomas can be impatient sometimes, but he is not this impatient!
 * 6) * In "Sodor Surprise Day", he was the one who caused Cranky to drop a crate of fireworks that Gordon was supposed to take to the castle! Of course he didn't mean that to happen, but it was still irresponsible REGARDLESS!
 * 7) * In "Day of the Diesels", aside from giving Belle a racist, but negative impression on diesels in general, he ignores Percy for no reason, even when Thomas himself is doing nothing. Not even him getting trapped at the Dieselworks by Den and Dart is easy enough to make you sympathize with him because of how unlikable he is in this film, and hasn't even learned anything in the events of the special at all. He doesn't apologize to Percy for unreasonably ignoring him, and he doesn't apologize to Belle or the diesels for his racist statement.
 * 8) He has lost all of the original personality and charm he had in the prior seven seasons and hardly saw the light of redemption until season 17 (though it varied whether he was in character or not in Seasons 8-11, depending on the episode and portrayal). He was turned into an engine who went from being optimistic, cheeky, fussy, smart, and playful to being a bad tank engine who is a complete idiot who is always simple minded, hardly pays any attention to anything, mostly never listens to what the Fat Controller or what another engine says, makes way too much mistakes and screws everything up constantly than usual, and comes off as a stuck up smart aleck whom he thinks he knows everything.
 * 9) * Sadly after Season 24, Thomas has been flanderized again, but this time he is now portrayed as a child compared to his original personality traits starting with the Thomas & Friends: All Engines Go! reboot in 2021. Which is a real shame because Mattel and Nelvana began picking up from where HiT Entertainment left off, turning the franchise into a franchise for small children.
 * 10) The most notably worst offender about him during those five seasons is where in some episodes, he acts like a stuck up smart-aleck who thinks he knows all about everything. "Misty Island Rescue" showcases this as he thinks he is in the right all the time.
 * 11) Overused a lot as the lead role during Seasons 13-16.
 * 12) Before flanderization, he had his moments when he would be careless and would occasionally mess things up or get himself into trouble. But here with Seasons 12-16, he does it on a regular basis.
 * 13) He comes cross as a racist against diesels. In "Misty Island Rescue", he told Diesel he wasn't very useful because he was... well, a diesel. And he never gets called out for that. In "Day of the Diesels", he gives Belle a highly negative impression on diesels by saying all of them are devious.
 * 14) Speaking of racism, he is a hypocrite.
 * 15) *His bias against diesels is completely hypocritical because he thinks diesels would never be useful, yet he has been good friends with Salty, Rusty, Paxton and Mavis, all of which are diesels.
 * 16) In some instances, he doesn’t get any comeuppance, making himself a Karma Houdini.

Good Qualities

 * 1) He was better in Seasons 1-11 and has redeemed himself since Seasons 17-24 and "Blue Mountain Mystery", until his flanderization came back again, except he is now portrayed as a child for the sake of the Nelvana reboot.
 * 2) There were episodes from the Miller era where he is in his best. Not to mention he has his original personality on occasion.
 * 3) He still cares about his friends and his branch line.
 * 4) He is voiced brilliantly by Martin T. Sherman, though Ben Small was okay.