Found a brilliant one today,
here. Told from Marrianes perspective, it perfectly summarises a possibility of her personality.
In it, she is cruel all she wants is her child to be the 83rd Emperor, and is dissapointed. So Lelouch is practicly neglected for Nunnaly who is pampered. So who was the mother figure that Lelouch thinks of with his mother?
Quite touching and puts a different tilt on the way you look at Lelouch and why he fights.