What characters. Everything you ever saw or heard depicted in a Scooby Doo animation is correct; this breed is more human than animal, more horse than dog. Despite their size they are not aggressive in the least, although they may talk your ear off.
But make no mistake, Great Danes are not for the novice dog owner. They require very early and thorough socialization to counteract some of their tendencies to become easily spooked, and they need lots of training because. Would you want to argue with one of these things?