Serving as the primary anti-hero of the series, Duncan is a punk and a juvenile delinquent who ironically comes from a long line of policemen, and policewomen: his dad, mom, uncle, aunt, grandma, and cousins are all cops. He knows many tactics from his time spent in juvenile detention centers. He can carve a picture of a skull into a tree trunk and lift great amounts of weight (such as Owen, who is about twice his size). He's a sarcastic kind of person, flirting with Heather despite his apparent dislike of her, and mocking Courtney whenever she gets near him. He also gives Courtney the pet name "Princess" to tease her. Duncan loves to break rules to better suit himself, but sometimes the consequences are worse than what he intended. Duncan also loves to make fun of the other contestants and pull several pranks on them, with Harold being his main victim (later intensifying it due to a certain move Harold made in Total Drama Island). He considers himself as being "straight with people," never pretending to be what he isn't, and has been shown to either get along with fellow competitors or make fierce enemies because of this.
- He will meet Pooh and the others in Pooh's Adventures of Total Drama Island.
- He will rekindle his romantic relationship with Courtney later after Total Drama All-Stars.