Diesel

"Devious" Diesel, as his name implies, is a sinister diesel shunter who originates from British Railways, and is the first diesel engine (at least standard gauge-wise) to arrive on Sodor. He is the main antagonist of the SC Shorts as of 2020.

Personality
Diesel is, in essence, the average pantomime villain. He is oily, malicious, devious, scheming and full of ideas to get revenge. He views himself and any other diesel as highly above the steam engines and believes that all diesels are "revolutionary" - he has also claimed diesels should be "rough and tough", as an excuse for bullying the other engines. His antics give diesels on Sodor a bad reputation, which causes most steam engines (particularly Duck and Thomas) to mistrust him. His rough demeanour also affects his fellow diesels, who are often victims of his tricks alongside steam engines, mainly diesels who are friendlier to steam engines and are just nice in general, with Paxton being a prime example.

Trivia

 * In "Best Friends Forever Part 1", Diesel revealed that he has a middle name, Kevin. This was a subtle indirect reference to the Thomas fan film, "Project G-1".
 * Diesel is the first and only diesel engine to be the main antagonist of the SC Shorts as of now.