1- Bringing In The People Who Will React + Underworld

Or, au where Weiss's older sister is the Code Vein protagonist who ran away and eventually ended up in Vein which eventually became an isolated "Kingdom" after the fall of the "Queen" and Team RWBY, JNPR, Ozpin, Glynda, Qrow and the Schnee family react to the events of Code Vein

Ships (mainly Code Vein):
Protagonist (Isla) x Louise
Yakumo x Emily
Jack x Eva