Hell's Rainbow
Option 1: Hell's Angels (an american motorcycle gang) Slash-Fic
Option 2: Lucifer, scorned by Yahweh for wanting more attention and affection than the miniature-Yahweh prototype A.D.A.M. (who is distant and has no emotions beyond primal, animalistic instincts, as real men should be), takes up arms in rebellion by gathering all the angels closest to him and storming the pearled palace. But, because Yahweh is basically god, it doesn't end well and all who oppose his whim are sent to the fire-pit, only to awaken on a fiery plane full of jagged rocks and magma, with their wings blackened and their halos gone. Still immortal to the effects of age, disease, and air pressure, but not quite immortal where injury and food intake are concerned, the fallen ones must stake a claim in their new realm. (Slash-fic optional)
Option 3: Protagonist is sick of society imposing rules that favor a certain majority, and despite equality being a goal for the minorities for the past century or two, it has only been sought up to this point using non-violent means, which allows those in power to take their time and make excuses for the lack of change, often blaming tradition for the slow pace of progress. Protagonist (the GM) wants to see results in his/her lifetime, so s/he gathers a bunch of people (those who are participating in the roleplay) and starts committing violent acts to disrupt the complacence of those in power. The initial blow is sudden, but it makes for a great rallying cry. However, the protagonist must go into hiding, lest s/he be given personal blame for everything that might follow in his/her wake. While still the face of this movement, it is ultimately up to the protagonist's allies to make Hell's Rainbow successful. (Edit to fit a preferred setting)
Option 4: COME UP WITH YOUR OWN IDEAS!!