I've been thinking about how the villains are always brand new guys with no previous motives.
I mean, I get the whole corruption thing Lego does, but it needs better development.
Like, Furno would make a good villain, he has the whole overcharged Hero Core thing going on, maybe a surge of power fries his circuits, thus making him evil and gaining an irrational hatred for Hero Factory. Would really work on the character development scale: Breez and Surge being obsessed with saving their friend, Stormer blaming himself for Furno's corruption, and Rocka worrying about the same happening to him.