I guess there's two ways of looking at it - how much is excluded, and how much is included.

And no matter how much is excluded, there's an unlimited set of characters inside just about any kind of bounds - even single race, single class, or single alignment. Most characters in most fiction are just plain vanilla humans, with no special abilities, and yet they are still very distinct.

So I think it's just a matter of knowing what the boundaries are, and picking a point inside that still-limitless space.

In my experience, people that hate boundaries will always want to pick something outside of the boundaries, no matter where those are drawn. The draw to them literally is being outside the boundary. People that can work with boundaries are mostly happy regardless of where they are.