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

Thomas the Tank Engine is an anthropomorphic train who is the titular protagonist of Thomas and Friends. During seasons 9 - 16, he has become badly butchered.

Why He Lost His Charm

 * 1) In Splish, Splash, Splosh!, he was being very uncareful while playing in the mud, therefore, his wheels would've rusted.
 * 2) He has lost all of the personality and charm he had in the prior eight seasons and didn't get it back until season 17. He was turned into an engine so darn happy all the time, hardly pays any attention or even listens, and so on and on in those dreaded seasons.
 * 3) In Wonky Whistle, he had a strange whistle that sounded ear-piercing to the point that it scared away the animals from a wagon he was pulling to a fun fair.

Redeeming Qualities

 * 1) He at least started to improve in season 17.
 * 2) There were episodes from the Miller era where he is in his best.