You're in charge and you decide it's time to mix things up. Which character do you "kill" and which character do you bring to the forefront? This can be any series or fiction you want; even the franchise as a whole. By kill I don't mean strictly end their life. You can just have them fade into the background. For me, I would "kill" Optimus Prime. I desperately want this IP to be able to flourish Optimus-less. I don't think I would actually kill him as that is very cliche. And I would actually bring back a pair of characters. Thundercracker and Skywarp. They are missing in current mass media and I like my seeker trio. But if I do that I want to make sure to push the uniqueness of each character.