Marco Romero
Jerome "J-Rock" Husselbeck
Adel San Juan
Andrus Poder
Harley
Basic pitch: Four supernatural factions in modern day Los Angeles are locked in a cold war for control of the city for decades, but just last year a new player arrives on the scene. Michael Silmoore is the last known survivor of the Silmoore Clan, a vampire bloodline famous for producing lots of really badass vampires, and Michael's trying to get the ball rolling again here in LA. He has earned the ire of local vampire bigwig Lestrand (who is affiliated with, but not a member of, the Covenant), and while the other three factions (the White Lotus, the Cauchemar Communes, and the King With Three Shadows) have yet to become involved, but with the delicate balance between factions upset it is very possible that things will spiral out of control and turn to all-out shadow war between all five of them.
The game is primarily about inter-factional politics, and the basic structure of any given adventure is that some event happens in which at least two factions have a stake, and the party will presumably get involved and make things go one way or the other, thus shifting the overall balance of power. Which way you shift it and why is entirely up to you, but it is by no means required that the city end up under the control of one faction at the end, so if you (for example) have a bunch of people from the Covenant and the Communes in the same party, making an agreement to keep the two from entering into a potentially disastrous war with one another while exterminating the others from the city is totally a thing you could do.
Also, it's play-by-post.
Now, this plot has been adapted about four times, which means lots of stuff stated to have happened long ago or far away by the AS book did not happen exactly that way in Mister Vampire, but everything nearby shook out basically the exact same way it does in vanilla-flavor After Sundown (EDIT: except for the one-line mention of LA being a Makhzen stronghold in the writeup on Ciudad de Mexico, that part has seen pretty heavy overhaul): The Cauchemar Communes controls the midwestern US to the east and the Covenant controls Mexico down south. The west coast is a gray area where both factions have a strong influence and neither wants to go to war with the other. This grey area means that minor cults like the White Lotus and Michael's attempt to reboot the otherwise defunct Silmoore cult are able to take and hold territory. Presence from the World Crime League and the Makhzen is minimal, but they're welcome. The King With Three Shadows is here and everyone wishes he wasn't, but no one wants to risk losing the whole city to him, so no one goes to war with him. You have probably gathered that Limbo is a strong theme of the campaign.
A few differences I can think of off the top of my head, mostly as example of how minor they are:
The Silmoore Clan used to be an extremely powerful syndicate about 300 years ago, but in the 18th century their holdings in the western hemisphere slipped away and their continued expansion into previously independent territory caused multiple supernatural princes to band together and form the WCL. The Covenant, also less than pleased with Silmoore's antics up to that point, began a parallel war with Silmoore in Europe. By the dawn of the 20th century they'd been beaten into a minor faction that mainly operated out of England, until Mister Vampire decided to pursue his unknown vendetta with them and assembled a team of supernaturals to wipe out the Silmoores.
Genghis Khan was a werewolf.
Napoleon wasn't any kind of supernatural.
The Stellar Oracles are usually called the Guardians (which is the name for their latest incarnation; "Stellar Oracles" is a loose translation of the original name and is usually considered archaic or used to refer specifically to the organization across time rather than its specific, modern incarnation, so people will talk about "the last of the Guardians" while understanding that the Stellar Oracles will be back sooner or later) and are on the way out. The bulk of the survivors got together and tried to dislodge the Covenant from Mexico throughout the 20th century. It ended poorly. There are no known survivors but (spoiler alert!) there totally were and it would be okay if you played one of them.
The Vow of Silence is often called the Masquerade still, because it sounds cooler.
The White Lotus, or at least the LA detachment, is on even worse terms with the World Crime League. They never really made peace after the White Lotus lost their war with the WCL, and those in LA consider themselves refugees who are rebuilding with the intent to retake Asia. Complicating matters is the fact that the Cauchemar Communes have since moved into chunks of Asia that the White Lotus would like; some members believe they should just make friends with the Communes, others think they should take advantage of the conflict to try and get the Communes and the WCL to fight one another.
Speaking of, China isn't solidly controlled by the Communes. The WCL has a lot of influence there, too.
I still do not know whether the story would be In Media Res or Origin Story, and I am open to suggestions. I also haven't really hammered down what sort of mood this thing is going for, and am likewise open to suggestions in that department.