This list should be pretty short. Badass dudes that are desert dwelling killing machines. So choose the ultimate badass in this category. Edit: Since this category is so small, you may also choose a dessert badass. Dudes that are vicious killers around cherry pies, chocolate cakes, ice cream sundaes, and tiramisu.
Damn.. beat me to a Dune character though i would simply have said any Fremen.. people who refer to Sardaukar as "some of them were quite good" are at the top of the food chain