What is fanon? Oh sure, there's the easy, quick answer—"Fanon is something Gonk purges from Wookieepedia with reckless savagery and unbridled loathing"—but deep down, it's a more complicated issue. The supposed definition of fanon is ideas generally considered to be true by many fans of a franchise which nevertheless have no concrete basis in canon. Wookieepedia gives the example of Palpatine's first name being "Cos." Plenty of fans might believe it and want it to be true, but by the rules of canon, it's not true. (The same goes for "Frank," by the way.)