You know, there's a lot of different ships with Lelouch, but the one I ship is the (seemingly unpopular) Lelouch X C.C. Why? Because she's the only one who's been right by his side the entire time. She's always known about his powers, his true identity, his goals. She's the only one who's known about just him in general. And he's the only one who her, considering he's the only one who had control of the Geass for so long (like her) and had the opportunity to see all what the Geass is about. In other words, they're the only ones who understand each other, making C.C. the perfect queen for the king.
AMV I was listening to while I made this.
In other news, I really need to rewatch this show. It's been about two years since I last saw it, and I don't remember as much as I should. :/