Percy the Small Green Engine

Percy is a little green saddle tank engine who was brought to Sodor to help run the railway during the big engines' strike. He is Thomas' best friend and one of the youngest engines on the North Western Railway and is quite cheeky, often getting himself into trouble with his attempts to play tricks on the other engines. Percy's favourite job is to deliver the mail and he works on Thomas' Branch Line as a goods engine. He is voiced by Benthe9ffan.

Origins
The big engines refuse to get their coaches and so Edward is brought in to shunt for them. However, poor Edward is met with hostility and so the Fat Controller buys a saddletank engine, which he christens Percy. The big engines still refuse to shunt and fetch their coaches, so the Fat Controller shuts them up in the sheds and brings Thomas to work with Edward on the main line while Percy runs Thomas' Branch Line.

After several days in the sheds for being naughty, the big engines finally see sense and agree to get their coaches ready, so the Fat Controller lets Thomas, Edward and Percy play on the branch line. Thomas takes Annie and Clarabel for a run and Edward takes some trucks to the quarry, leaving Percy alone. He strays onto the points, and Gordon scares him when he rushes into the junction. Percy flees, and eventually, exhausted, runs in a sandbank. Gordon later commends him for preventing an accident and Percy becomes the brand new station pilot at Tidmouth.

One cold morning, Percy complains that he wants a scarf, even when Henry tells him engines do not need scarfs. When he goes to shunt some coaches, he approaches the platform so quietly that he runs over a trolley, scattering luggage everywhere. The Fat Controller, furious, seizes his top-hat off Percy's lamp-iron and sends Percy away with a pair of his trousers coiled around his funnel. Now Percy does not like scarfs.

Percy helps Toby clear the Mess, after James crashes into Oil Tankers. They also make fun of James, because he said his paint wouldn't get dirty. He is also present when the Queen comes to Sodor. He and Toby get exited, and whistle, "She's here! She's here!"

After playing jokes on Gordon and James, Percy decides to stay out of their way for a while, but when he is asked to take a train to Knapford he gets careless and goes over to tell them. Seizing their chance, they tell him about "backing signals", and as he stops for the signal outside Knapford, he is convinced that he is waiting for a "backing signal". He ends up making a fool of himself, and Gordon sees the whole episode.

The Fat Controller is getting a new engine to help Percy, but Gordon and James tell Percy that if he worked harder they would not need one. Percy, cross, works all day and is exhausted, but is happy when the new engine, Montague, known as Duck for his "waddle", arrives. They have a happy day together, but then Henry, Gordon and James order them about. Percy and Duck, in retaliation, block the entrance to the sheds. The Fat Controller comes and tells all five engines off. Percy is sent to work at Knapford, and Duck manages the workload alone.

One day at the airfield, Percy meets a noisy helicopter, Harold, who says railways are slow and out-of-date. Percy, furious, is later taking some trucks to Knapford Harbour when he sees Harold in the air and decides to race him. At the harbour, Percy thinks he has lost, but his fireman sees Harold looking for a place to land. In congratulation, his crew and the workmen sing a song about the race.

Thomas is busy and asks Percy to take the Vicar and his Sunday School's children home from the Beach. Percy agrees, but it starts to rain heavily as it is time to leave. Percy stops in front of a flooded paddock, but cannot go back, as a bridge has collapsed. As he crosses the paddock, water sloshes into his fire and he stops. Percy struggles on, fuelled by floorboards from Clarabel. After Harold drops some supplies for them, unfortunately landing on Percy's boiler, they make it to safety, and the Fat Controller congratulates the two.

At Barrow-in-Furness, Percy is telling some tank engines about the time he braved bad weather when Henry arrives. Henry tells the tank engines to go away, calling Percy silly for being egotistical. Percy responds by reminding Henry of the time he stayed in a tunnel and runs off to Knapford. There he sees a board which says "Danger". Thomas tells him to obey it, but Percy is curious and persuades the trucks to push him past the sign. They do so, but push him too far and cause Percy to fall into the sea. After being scolded by the Fat Controller, Percy is "fished out" and sent to the Works.

Sudrian Chronicles 1
When Thomas wakes up (before Jacob Smith shows up to tell Thomas he's the Controller) Percy says, "What up! What up!" When Thomas is elected Controller, he is one of the Engines who helps James and Henry with there plan. When Thomas tries to commit suicide, Percy is the one who convinces him to come back, by saying, "Come on Sir".

Later, Percy is one of the Engines present when the Sheds are attacked by Billy Smiths team. He also helps the Other Engines rescue Sir Topham Hatt.

Sudrain Chronicles: 2

Percy (along with James) was neglected by Thomas because he spent all of his time with Nick, the 2 engines then make a bond and start to talk to each other more, and get taken hostage by Jacob Smith in the climax of the movie, but the Fat Controller and Thomas save them and defeat Jacob Smith.

Percy's Basis
Percy is an 0-4-0 saddle tank believed to have been built by the Avonside Engine Company of Bristol, but prior to being purchased second or third hand by Sir Topham Hatt he acquired components from Hunslet of Leeds and other builders.

Trivia

 * Percy is the only known Character to be named by Sir Topham Hatt.