One for Sorrow

I was thinking about essential choices today in HP...well, that and Peter Pettigrew and Draco. It all goes back to that line in CoS, ( It's our choices that show us who we are. Spoilers for HBP. )

Two posts ago we got into an exchange about an old thread on FAP entitled "HP Structure Demands More Draco," and it's made me think about how characters tend to work in the series and how that may or may not predict what they will do. ( If that made sense, come along with me! )