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No, in Sonic The Hedgehog (2006, which is canon), Sonic had a form of romantic attraction towards Princess Elise, so no, Sonic is NOT gay.

Well, honestly, that's debatable. Elise certainly had an attraction towards Sonic, but it's debatable if it were true to vice-versa. Especially since there is a point in-game where you can choose you're romance interest.  Timelinesplitter Chaos 21:05, December 26, 2012 (UTC)