I read a hilarious thread on a Guild Wars 2 forum where people, all of them apparently either relatively new to MMOs or really young, were trying to determine where "toon" for "character" came from. The true explanation, that being that it came from the fact that The Realm Online (which was one of the first big graphical MUDs, pre-dating even Meridian 59 in it's semi-open beta), where your PC was literally a cartoon, was ignored in favour of various bizarre revisionist theories (none of which accounted for the fact that "toon" was well-established as a term for "character" by the time EQ was out).