Here's some more.

OVERALL:
Alternate realities are involved

RANMA:
is missing and presumed dead
becomes engaged to someone besides Akane or Ukyou

RYOGA:
marries Ranma

UKYO:
gets poisoned
gets spelled "Ukkyo"

KASUMI:
works at the Ogenki Clinic

Crossovers:
Godzilla appears
Nuku-Nuku appears
Gally appears
Guyver unit appears

Betwwen sadfics...and the Fanfic drinking game...

lies Obsession.

--Sean Gaffney
--"You git!  I thought you were dead!  Git git git!" - Benny, No Future