6. Shaggy (Scooby-Doo)
While Shaggy might be lovable on screen, in reality he would just be that clumsy stoner you can't get to leave you alone. As a result, a life with Shaggy as your best friend would be terrible. He has the power to eat food like a garbage disposal, he's incapable of following directions, and pretty much everything in the world scares him. Imagine introducing him to your parents. He'd show up high with his dog and start eating all the sausage links. You might argue that he has a kind heart and that should be enough for any friendship, but that would be before you were left alone to deal with the monster because your best friend ran away at the first hint of trouble. Plus, you have to think that Shaggy is eventually going to come asking for money. Scooby eats an ungodly amount of designer dog treats, plus his only source of income is from the proceeds of a teenage detective agency.