Regarding ZEL:
It would make me sad if Sigmund didn't get comeuppance, but I would consider the whole "dying" thing to be... A poor fit. He scarred Charlotte, Anna, Noel and Heather after all, and they... I'll avoid tempting fate, there. Just in case.
If Bennett or Fern reached their goals working for the Meteors, I just think that would be disappointing. Especially Bennett, but I don't know Fern's goal(s)? To be the jerkiest of them all?
What would break my heart (and in retrospect this is pretty hearless) is not being able to finish the Reborn League. Or getting curbstomped by Lin. Or, for actual emotional impact, having to watch her (semi-literally) curbstomp Cain and the rest of our friends.