Huck and Jim: Who's "protecting" Whom?

One thing that really stuck out to me as I continued my reading of The Adventures of Huckleberry Finn was that Huck and Jim seem to be in a very CO-dependent relationship; that is to say, where at first I thought that Huck really depended and relied upon Jim to fill his void for a father figure and give him life advice along the way, it seems that there are many times in which Jim needs Huck as well. At the very least, Huck is extremely concerned for Jim's well-being, and he protects him with urgency many times throughout the novel. In return, Jim helps Huck to see things in a more rational, logical manner instead of only seeing things in a short-sighted way. In short, I've noticed that the two truly "balance" each other out, and although I am uncertain if they are exact "yin yang" opposites, they definitely have some opposing tendencies and character traits.