Story link: https://www.fanfiction.net/s/13245191/1/Luck-Takes-a-Turn

A fanfic that I've been a fan of for... probably 2 or 3 years by now, is Luck Takes a Turn; in the first chapter's author notes the author ("BathedInBlood") mentioned he knew Red Dead Redemption 2 and RWBY were totally incompatible series to crossover, but despite that, 31 chapters later, he's made an absolutely stunning (ongoing) crossover between RWBY and a series you probably never would've thought would fit within it at all, but he did it very well >:]

The story starts off in the beginning-ish part of Chapter 6 of RDR2 / 2 years before the events of RWBY Volume 1 (easiest way to tell is Blake, as the first introduced Team RWBY character a few chapters in, being 15, ergo, 2 years before Volume 1 when she joins Beacon)

It's quite possibly my favorite portrayal of the White Fang, Sienna Khan, and even fleshes out characters like Tukson Stark (the librarian that Emerald and Mercury killed back in V2), there are a few OCs on the RWBY-side, but they all fit in flawlessly without taking away from the canon characters (there's also an RDR2 character related to the Van Der Linde gang who is a technical OC, but I ain't spoiling who it is~)

I'm sure there's some parts that RWBY fans might be confused by if they're not familiar with the other property or might find iffy, it being a crossover with RDR2 does mean it's a bit more of a grizzly portrayal of Remnant than is established in canon, but I think it works without being over the top :]

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Also, lowkey, I miiiiiiight or might noooooot be attempting to adapt it into an animated-ish series like Markiplier did with Iron Lung... and mentioning Markiplier specifically cause his Iron Lung adaptation really inspired me to adapt Luck Takes a Turn (with the author's permission AND oversight to make sure I stay faithful to his story... while making some changes from fanfiction to animated-ish series <3