So, here’s my updated tally:
Dick Grayson: Bruce’s and Dick’s parents have to die.
Total: 4
Jason Todd: Same as Dick.
Total: 4
Carrie Kelley: Same as Dick and Jason, but Jason dies and Dick goes insane.
Total: 6
Tim Drake: Same as Carrie, only Dick becomes Nightwing instead of the Joker… And Dick being Nightwing requires Superman, which requires all of Krypton to die.
Total: Billions?
Stephanie Brown: Same as Tim.
Total: Billions?
Damian Wayne: Blah blah, Demon’s Head, Damien Dahrk, etc., and also the same number as Tim and Steph, since Jason comes back and Steph “dies”.
Total: Billions?
Duke Thomas: Bruce’s and Dick’s parents, Duke’s parents, the Joker, but on the bright side, Steph is back.
Total: 7
Maps Mizoguchi: Bruce’s and Dick’s parents and that’s it.
Total: 4