Norville "Shaggy" Rogers is a fictional character and one of the main characters in the Scooby-Doo franchise. He is generally depicted as cowardly, lazy, an amateur detective, and the long-time best friend of his cowardly dog, Scooby-Doo.
Vote which fictional character would naturally fit in-universe with a big-named franchise! No time-travel, no interdimensional crap, no "Pooh's Adventures", they would just exist in-universe.