What are several examples of colloquialism in literature?

Huckleberry Finn, Eliza Doolittle, Holden Caulfield and Alex DeLarge are four notable examples.

"You don't know about me, without you have read book by the name of 'The Adventures of Tom Sawyer,' but that ain't no matter." --Huckleberry Finn, The Adventures of Huckleberry Finn, Mark Twain

"I ain't done nothing wrong by speaking to the gentleman. I've a right to sell flowers if I keep off the kerb." --Eliza Doolittle, Pygmalion, George Bernard Shaw

“Grand. There's a word I really hate. It's a phony. I could puke every time I hear it.” --Holden Caulfield, The Catcher in the Rye, JD Salinger

"There was me, that is Alex, and my three droogs, that is Pete, Georgie, and Dim, Dim being really dim, and we sat in the Korova Milkbar making up our rassoodocks what to do with the evening..." Alex DeLarge, A Clockwork Orange, Anthony Burgess