Percy the Small Engine (seasons 1-14, 17-24)

Percy the Small Engine is the deuteragonist of the Thomas and Friends series. He is a small green engine, and one of the youngest engines on the Island of Sodor.

Why He Rocks

 * 1) He is among a fan favorite/favorite of the main cast, and the franchise altogether.
 * 2) His naive but positive personality is what makes Percy a likable character.
 * 3) He was given his own name by the Fat Controller/Sir Topham Hatt.
 * 4) While he can be a softie at times, there are plenty of episodes showing he's brave. Examples include "Percy's Promise", "Percy Gets It Right" and especially in "Put Upon Percy".
 * 5) His friendship with Thomas is incredibly charming.
 * 6) He along with Toby started the Ffarquhar trio, Thomas, Percy himself, and Toby.
 * 7) His green color fits him and matches his personality as well.
 * 8) His episodes where he and James get the lead role together make him and James a very good duo, like how Ren and Stimpy are a great duo together.
 * 9) His redesign in the "Meet the Steam Team" series videos looks really wonderful to him.
 * 10) Despite being rather simple-minded, he tends to be kind, caring, and curious.
 * 11) *This is better shown when he is very well-intentioned and often tries his best to help others out.
 * 12) Has the best crashes he could perform in the series, much to the fact that he is comically accident-prone.
 * 13) *Much like Goofy: his klutziness/blunders are always done humorously.
 * 14) Without him, the railway would never be the same.

Bad Qualities

 * 1) Sadly, he lost his original personality during Seasons 15 & 16 and the infamous "Day of the Diesels" as he was turned into an idiot, a dimwit, and a crybaby who obsesses over Thomas' attention and made a big deal over Thomas befriending Belle and Flynn in said special, yes Thomas may have ignored Percy, but that gives Percy no reason to behave like that. "Percy and the Monster of Brendam", one of his worst episodes, made him painfully dumb where he was asking to be scared by some so-called "Monster of Brendam". His downfall was short-lived like Jerry in the Gene Deitch era of Tom and Jerry from 1961-1962 and SpongeBob in Seasons 6B & 7.
 * 2) The infamous episode where Percy attempts at befriending animals because he wants to play whilst he might have work to do on the railway would be something very against his character as Percy usually likes animals, but he would never obsess over-attention to animals.
 * 3) He can be a target for insults at times by Gordon and James and especially the trucks. (although he still proves them wrong)

Trivia

 * One of Percy's models is currently on display in Japan at the Hara Model Railway Museum (previously on display at Nitrogen Studios), along with his large-scale model used for the spin-off series, The Pack (previously on display at Thomas Town). One of Percy's original face masks is also in possession of Twitter user ThomasTankMerch.
 * Percy is the only engine that is known to have been named by the Fat Controller/Sir Topham Hatt.
 * In the French narration of the Classic Series, Percy is called "Pierre", and in the Greek narration of the Classic Series, Percy is called "Jerry". From the thirteenth series onwards, Percy has been referred to with his original name.
 * Percy has been shown to be quite popular among several people who worked on the series, according to Abi Grant on her website, Percy is her favourite/favorite character, Britt Allcroft also stated he was her favourite/favorite character due to him being green and cheeky, Percy is also Mark Moraghan's favourite/favorite character, alongside Cranky.
 * Percy is the first character other than Thomas to be the protagonist in a special, with that special being Day of the Diesels, which he would later do again in Tale of the Brave.
 * In "Thomas and the Rumors", it is stated that Percy had a branch line, although it may have either been a plot hole, or had been mistaken for Thomas' Branch Line.
 * Percy was featured on the 1986 single cover along with Rheneas of Oh L'amour, a song by English synthpop duo Erasure.