Before cries of outrage erupts in this newsgroup, please look at the following list. To see why I (sometimes but not always) refer to the inventor of Daria as "Evil" Glenn Eichler.
Story Inventor Most annoying character
Sailormoon Naoko Takeushi Chibi Moon Star Trek Next Gen Gene Roddenberry Wesley Crusher Star Wars George Lucas Yar Yar Binks Scooby Doo Joe Barbera S c**p py Doo And Finally Daria Glenn Eichler Tom Sloane
I hope you can see the pattern: Great minds creating fantastic worlds (exept the Scooby Doo-World). Sooner or later introduce a new main characters, who are super c**p.
That simply show us, that authors are only human like us, who can make horrible mistakes, but hey... it is their babies.