No, that's not a misspelling.
One thing I've always liked about RPGs is that you get to make your own character and have your own adventures and make your own mark on the game world. But when you're dealing with an RPG based on an established property (let's say, to pick a random example, Oz) you've already got a cast of protagonists who have all of the important adventures. Dorothy and company have melted Wicked Witches and saved Oz in a number of other ways throughout the stories. So if you wanted to roleplay in Oz, you've got to be Dorothy, Scarecrow, Tin Woodman or Cowardly Lion, right?
When Wizards of the Coast launched their Star Wars RPG their ads featured stills from the Star Wars movies with multiple characters gathered. Even if a major character was in the frame, the ad instead drew a circle around the head of a minor character or an extra and asked the question "What's his story?" Sure, Luke Skywalker was the guy who blew up the Death Star, but he's not the only person in the Star Wars universe. And those other stories have the ability to be just as interesting and compelling as Luke's.
A lot of people seem to agree with me, because RPGs that focus solely on the main characters of the franchise are generally unsuccessful. The original Indiana Jones RPG from TSR focused solely on Indiana Jones and his compatriots. An old Doctor Who RPG (namely Time Lord) has an astonishingly complete list of stats for every Doctor and every companion to enter the TARDIS with the assumption that you are going to be playing those established characters. Neither of these games were successful, especially compared to other RPGs based on those properties that did allow original characters (such as the new game Doctor Who: Adventures in Time and Space)
Another problem that comes up when dealing with established characters has to do with expectations. Once a character gets a certain body of lore built up, especially if it's written by different people. Suppose that in a superhero game, someone decides to play Batman. Not just some guy who's kind of like Batman, but Bruce Wayne Batman. As a character who's appeared in thousands (if not millions) of comic books, several films and a number of TV shows, he's got a lot of background. Which means that every time somebody says "Batman would never do that!" someone else can come up with some instance in some media where Batman did just that. Suddenly, you've got everyone at the gaming table telling you how to play your character and no one agrees on what to do and, most importantly, no one's having fun.
But what about those characters that I've been putting up on the blog for the last few months? Am I suggesting that you completely ignore them?
No. My primary motivation in posting them is to show you what a character looks like and to demonstrate that my system can handle the majority of Oz character types. If someone decides to use them as their character in a game, I don't mind. Sometimes, just starting out, it's useful to have a character you're already familiar with. But I think you'll have more fun by putting your imagination to work on creating your own characters.