Scruff is a grubby little chap, with a lime green boxy shape. He is more than content with "scrunching" and shunting rubbish trucks at Whiff's waste dump and has few other aspirations. He has been known to run in fear and hide away from things that he does not quite understand and can find having all the focus on him a little daunting. It seems, at times, that Scruff would rather be busily working in the background. However, he is cheerful to welcome engines to the waste dump and happy to have others join in with the "scrunching". He is notably, perhaps, one of the few engines on Sodor with little desire to be clean and presentable. Scruff's main motivator is being able to just get stuck in and knuckle down with his jobs.