As the television series has progressed, Percy has been dumbed down in order to teach viewers difficult words: he would say "dingy-fried" where anyone else would say "dignified". He also is shown to make obvious mistakes. Percy is incredibly accident-prone, and holds the dubious record of the most accidents in one season - five, in the second season - crashing into some buffers, falling into the sea, being pushed onto a brakevan, colliding with a cart, and being hit by a falling crate of treacle. So far, his silliest accident yet was in the sixth season, when he slipped on oily rails, crashed through the chocolate factory, and emerged covered in chocolate.
| Name | Percy |
| Gender | Male |
| Credited In | 2 movies |
| Credited In | 0 shows |
| 1st Movie Credit | Thomas and the Magic Railroad |
| 1st Show Credit | Thomas the Tank Engine |
| Alias(es) |