Not just the character, but how they build up, their flaws/weaknesses, their emotions, how we become them, etc.

Again, is this a question?

Siriusly dudes.

I'd have to actually think about it.

By far! There's quite a few characters in Twilight that have a LOT of potential, but the finished product is one-dimensional and flat. Alice is an example, even though I do like her.