Percy is a cheeky little engine. He has a strong sense of righteousness, and can certainly be called an "underdog".  He is an Saddle Tank engine, and can usually be seen at the Harbour on Thomas' Branch line.

Sometimes he pulls the Mail train, but mostly meets Toby to collect stone trucks.

One day, the Vicar of Knapford and his Sunday school come to Knapford Harbour. Thomas is busy, so he asks Percy to take the train home. At four, the weather becomes horrid, and Percy has to act quickly. The events of his starring story happen after this.

Voice:

Percy is a small, plucky shunting engine. He's one of the youngest of the main 10 engines (second to Duck), so he has a much younger voice than most of the other engines. Percy meets Sir Topham Hatt at a big warehouse around London, so I've given him a London accent.

All Of Percy's Voices (1:55)

Percy's Promise (Season 3, Episode 2, US, George Carlin)  (3:48)

Paint Pots and Queens | Thomas the Tank Engine Classics | Season 4 Episode 18  (4:02)

EP 1: The Deputation

EP 2: A Close Shave

EP 3: Toby's Tightrope

EP4: Percy's Promise (Starring Role)

EP 6: Paint Pots and Queens