Except one of them totally will because it's Code Geass, and it's full of melodrama bullshit.
I actually think it will be Milly, too. Shirley already got shat on in season one with her father's death, and no one cares about Rivalz. Lelouch, Suzaku, Nunnally, and Rolo are too involved in the main plot, leaving only Milly--the happy, positive, good-natured one.
Face it: she's gonna die.
I guess they could kill Arthur off, but that's a bitch thing to do.