Wynonna Earp is.... well, it’s basically Buffy with a gun. A young woman chosen to fight evil in a small town, a small support network, a mysterious handsome stranger with his own agenda...
It looks a lot more like Buffy than the original comics, the name and calling being about all they really have in common.
Note that this is not a complaint. As Buffy knockoffs go it’s pretty functional give or take some logic wobbles.
It doesn’t aspire to the heights of humour or weirdness of Buffy, but hey, early days.
Character-wise, Wynonna is a bit closer to Faith, a notorious local wild child with a liking for booze and motorbikes, having to grow up due to her unwanted legacy. She isn’t slayer-level powerful but agile, tough, heals pretty fast and has a magic gun that only works for her.
Her Scooby Gang is mostly her sister Waverly, all read up on the legacy for the early Willow helpful nerdy role. There’s also Dolls, who is not a creepy puppet but instead a government agent with secrets of his own, and the aforementioned mysterious stranger Doc.
Her mission is to re-kill seventy-seven revenants originally killed by her ancestor Wyatt with that same gun, made easier by them all being stuck in a mystic triangle centring on her home town, and more difficult by sheer numbers. This leads to a cold war, though she keeps killing them off one by one, because their leader is too busy with another agenda to just take her down...
To run as a game, stat up the legacy, the gun and what Doc is, and go.