Chaotic Neutral

Chaotic Neutral is one of the Nine Alignments, combining Chaos with "Evil" (malevolent intentions, being oriented towards the Dark Side, etc.), both a game mechanic, and an actual concept within the universe of the franchise itself.

Description
Chaotic Neutral characters are individualists through and through, abhoring any kind of rules and regulations that aren't self-imposed out of their own free will. They protect their own liberty (though not necessarily the liberty of others), they avoid authorities, resent restrictions and openly defy traditions. Despite all of this, they're not Anarchists - openly challenging the existing order as a member of some sort of (quasi-)Anarchist movement would require being motivated by either good (a desire to liberate the oppressed) or evil (a desire to make people suffer by spreading chaos and destruction). Chaotic Neutral characters are not like that. Aside from the fact that they lack any sort of devotion to Light or Darkness (seeing both of them as two sides of the same acursed coin they want to distance themselves from), they are individualists first and foremost, protecting their own liberty first, with the liberty of others merely being an optional afterthought.

Chaotic Neutral characters tend to be unpredictable, but they're not completely arbitrary: they won't jump off a bridge for no reason, among other things.

A common stereotype of Chaotic Neutral is the Rebel Without a Cause, a hormonal teenager rebelling against the authority of his parents, but it is an oversimplified caricature. Chaotic Neutral characters aren't rebelling against anything that isn't forced upon them against their will. In a world where people are solid objects desperately trying to fit into various molds, Chaotic Neutral characters are the water that flow around said molds. They don't usually seek to promote open insurrection - they simply like to point out that no authority is omnipotent or omnipresent, and that they fear no eye that is incapable of constant surveillance.

Observance
Chaotic Neutral in its truest form is a rare alignment, and for a good reason: with the exception of a small minority of philosophers and metaphysicists (who made a complete school of philosophy and metaphysics out of the belief, that chaos on earth is order in the cosmos), everyone who might seem "Chaotic Neutral" at first glance is quickly revealed to gravitate either towards Good (somewhat selfish and undisciplined, but otherwise well-meaning, well-intentioned people who simpyl want to be left alone) or Evil (psychopaths who hate regulations for making it harder for them to act out their sadistic fantasies). A truly Chaotic Neutral character is someone who makes their own way in the world, doesn't follow conventional morals, but doesn't harm others for no reason either: they do what it takes to survive, they kill or steal if they have to, ultimately protecting their freedom.