I never really thought about it before, but what determines a "Marvel character"? When Marvel published stuff like Star Wars, Alf, GI Joe and Transformers were Optimus Prime and Luke Skywalker considered Marvel characters? Does/ did Howard the Duck fall in this same category? Why or why not for all of the above questions? If I've never heard of, say Alf, before, how would I have known he's not friends with Spider-Man?