Old School for Younger Readers!

[Lunaludus Scribex]

Okay, here's one I just dug up and reread for the first time in ten or twenty years:  Jim Bader's A Tale of Two Wallets.  Late 1990s-vintage Ranma-centric megacrossover (I identified nearly twenty different works, either as major parts or cameos, and I'm sure there are more that went right past me because I was unfamiliar with them and didn't recognize them).  Worth a look.  Sorta-kinda finished?  The main story seems to conclude properly, but there's an incomplete epilogue/sequel tacked onto the end of it, which is unlikely to ever be finished as I seem to recall that Bader passed away some years ago.

Anyway, you can find it on MediaMiner here, or on Fanfiction.net here (link goes to chapter 2, because chapter 1 is actually a genealogy full of spoilers).

Ah, that brings up some memories.

AToTW was loosely affiliated with a multi-author collective of Ranma fics from the early 2000s known as "The Altered Destinies." One of them--A Scary Thought (once the engagement is made, Genma tries to dump Ranma on the Tendos to raise, and Soun, suspecting his friend of laziness, insists Genma raise one of his daughters in exchange--in this case, Kasumi)--is still ongoing and would probably not count as old school, but most of the rest are either complete or long dead.

That includes A Very Scary Thought (another work by Bader--same premise as A Scary Thought, but with Nabiki instead of Kasumi), Switching Heirs (similar premise, but with Gendo raising Ukyo and Ranma staying with his mother), Most Unlikely of Friends (early meeting and friendship between the Tendo Family and the Chinese Amazons) and others.