Carla?!?!!? Gamewide Plots You'd Like To See (In General): I wouldn't even know how a musical plot would even work...
But yeah, I am very cool with any and all of the above suggestions. I especially like the idea of an election because I have never ever seen that before and it's new and cool. I also would like to give Bear an army of Dead Ninjas for his Halloween plot (here, have this box of dead zombie ninjas I have just lying around) and one plot leading to the next (the AoA thing plus secondary power boost) sounds great.
Villain Ideas: I'm just going to come out and say it: we need to Dark Reign it up in here. Everyone's got these great ideas for villains that can come and go as comics are wont to do, so why not just everyone pick one and we'll make a counter team to the Sentries. I have something in mind that I never got to finish on a previous game, so why not pick someone else's nemesis and we'll have a little Legion of Doom with their own motivations and dramas? Ehh?
Anything else? A calender of events would be nice. Nothing too formal or set in stone, just a list of what we're going to do and when so that someone's personal plot doesn't get mixed into a game wide thing and everyone gets confused.