4chan would be a disheveled, unshaved, pale, creepy young man who always hangs out behind the K-Mart for like hours each day, wearing the exact same hoodie and jeans, except no one tells him to go away since they're afraid he'll bite them and give them hepatitis. His speech consists almost entirely of internally developed, bizarre catchphrases, and profanity. Despite his appearance and personality, he is somehow manages to convince people he's never met to do him favors and spread knowledge of him, though refuses to return any favors. In his spare time, he helps catch pedophiles and would-be terrorists, though for his own personal amusement instead of any sense of morality.
Encyclopedia Dramatica would be a very neat, tidy, mild-mannered white homeschooled kid with almost no real friends who tries really hard to be exactly like 4chan until he has to go home for bedtime at eight every day.
TV Tropes would be that one nerd in school that everyone sees as cool and treats with respect, and no one knows why. Tends to hold conversations that can last for hours on end, but are never boring.