[Thank you, subtle subject change. He... actually gives a faint, dry chuckle at that. Whoo boy, this one would be fun.]

That's a common misconception. The Heartless are darkness made real, usually made of the remains of a heart that has either been crushed by the weight of a person's negativity or had been stolen away by another Heartless. They're called Heartless because they act in a matter that is cold and ruthless; devoid of any emotion.

[...The way he says it, though, implies much more than he lets on.]