Originally Posted by
Excession
Mane 6 as undead huh? How about a different kind of undeath for each:
Twilight - Lich necromancer. That or lich = alicorn, and Twilight eventually becomes one.
Rarity - Vampire (sorry, but it's true).
Pinkie Pie - Zombie. Insatiable hunger, can't be out-run, yep.
Fluttershy - Ghost. Quiet and shy, but she can go poltergeist mode when angry.
Rainbow Dash - We need flight, so maybe Wraith?
Applejack - Skeleton maybe? I think I ran out of ideas.