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Adaptation Dye-Job: Has lighter blond hair with darker tips in manga artwork, but the anime gives him a uniform dark blond shade. His eyes also changed from being violet (or light blue) to a deep blue. Both changes make him look even more like America. Season 5 gives him back his violet eyes, and changes his hair color to a strawberry blond shade.
Adorkable: In a much different way than his brother.
Forgettable Character: His interactions with other characters often involve them forgetting who he is or that he exists and/or mistaking him for his more outgoing brother America.
Goggles Do Nothing: Possibly justified? Canada was the aircraft manufacturing and flight training center for most of the British Empire in WW2 and his uniform is aviator-appropriate and seems to include a parachute. While America is clearly dressed as a fighter pilot, Canada is likely to be a bombardier or navigator.
Heavy Sleeper: Seems to be narcoleptic, as one of the webcomic strips has him speaking to someone else and then both fall asleep randomly. See his quote as well.
The Unfavorite: Canada has always been overshadowed by America ever since they were little. As soon as England seemed to be paying more attention to Canada, America came along and took his attention back.
In fact, poor Canada is usually treated as a non-entity - people either forget who he is or don't even notice him. (In one strip Russia spends a whole meeting sitting in his lap because he didn't notice that Canada was already sitting in the chair. Later Russia comments to Belarus on how comfortable his chair was.)
Real Men Wear Pink: Wears a pink flowered shirt, loves sweets, and goes to the Halloween party with a rabbit-eared headband, calling himself cute. And yet he's one of the manliest characters in the series.