The way I see it is the only way Lelouch can achieve the darkness some of the interviews hint at is he would have to lose one of his special people. I hope it's not Nunnally. I also don't understand why people want so much for him to be evil and get all pissed when he isn't a cold-hearted bastard all the time. I like it that he surprises us; predictable characters are only so much fun.
Re: tl;dr