It is very clear from the first chapter of the book that Huckleberry Finn is a rebel. He describes in detail his past adventures with Tom Sawyer and the money that he now has saved from it. The "nonconformist" that Emerson describes is immediately present, "Then I slipped down to the ground and crawled in amongst the trees, and sure enough there was Tom Sawyer waiting for me." This act could be seen as Huck just being a kid, sneaking out at night to be with friends, but it can also be seen as an act of nonconformity. This raises the question of whether Emerson's statement, "Whoso would be a man, must be a nonconformist" is talking about menial things, such as sneaking out a night, or much larger things, like faking a death and then hiding from
