Alternate Chi Wars
There are a plethora of alternate storylines you could take with the same basic mechanics and archetypes with some caveats.
The mechanics, archetypes and intentions of Feng Shui are meant to represent high octane action movies. This can be grim and gritty or it can be goofy and fun-filled, but the focus is on action and characters being awesome. If you were to do the Cthulhu Mythos with Feng Shui, it wouldn’t be a cosmic horror game, but a game with people taking a steel-toed boot to the Elder Gods
The general setting is one where the villains are in control and the heroes are standing alone against a sea of corruption and greedy people. In general, the good guys are going to be the underdogs and the official authority are either going to be ineffective, complicit with the villains or actually be the villains.
If the government or some other significant “good” group is in command over the feng shui at the moment, then they will be largely under constant siege. The feeling of being against the odds is important. Look to the Jean Claude Van Damme movie “Time Cop” for example where the official organization responsible for keeping history secure is under constant assault through the bureaucracy with budget cuts and so on.
If you have a less frantic situation; competent and stable governments protecting the world and history as we know against ne’erdowells; then you could just skim past the downtime parts for the points where there is a major crisis building. Or don’t, depending on what the players like. The Nanoha franchise gets a lot of mileage from spacing slice of life elements in between long stretches of awesome, hot-blooded action sequences. Also, in this case, you could end up with a secret system of diplomacy stretching out across centuries with meetings between Wu Zetian, Imhotep, Abraham Lincoln, King Minos and Luke Skywalker about protecting the time stream (to pick a random set of characters).
Actually, now that I think of it, that last reminds me of the Antarctic Press Time Lincoln comics, by Fred Perry, I believe.
The characters are the good guys. If you're playing a vampire exile from an Anno Dracula time line then your a vampire who successfully helped humanity conquer the right feng shui sites to make sure that Dracula's vampire world order never occurred. As an innerwalker, they now live in the future they helped insure and have found that there are new villains to face. If you're an eldritch abomination born of the Elder Gods, then you have for some reason come to like humanity and helped them arrange things so that humans came out on top instead of Cthulhu and company. If you're from a lost utopia, you aren't setting out to return to it because your code of ethics prevents you from taking away the lives that all these people around you already have so you mourn your lost timeline and make due the best you can. No matter what your origin, you're there to take names and kick ass to protect the common man.