Burger King's admittedly creepy king tops the list, but I don't think he's quite as creepy as Quizno's rat/hamster and Domino's 'Noid' which are way down at positions 9 and 10.
What was Quinzno's thinking when they decided to feature a rat-like creature in their television ads? Obviously someone with an ounce of common sense knocked some sense into them pretty quickly since the campaign was fairly short-lived, but how could it ever have happened in the first place?!?! Well, this is the same company that doesn't see anything wrong with being the only fast food chain to not supply nutrition information for all of their food.
Here's a Quizno's ad feature the 'rat':