
Whose curse is worse? Meliodas'/Elizabeth's or Beelzebub's?
Meliodas and Elizabeth (The Seven Deadly Sins) were cursed to eternally fall in love with each other, but while Meliodas was made immortal, Elizabeth was instead made mortal, and forced to always die and be reincarnated, whenever she regained her memories, of a prior life and love with Meliodas. Essentially forcing Meliodas to watch his lover die repeatedly for eternity, and essentially permanently stripping Elizabeth of her memories.
Beelzebub (Record of Ragnarok) was cursed by Satan, to always kill those who he loves, at the peak of his happiness and affection for them. As a God, he cannot die naturally, and he was also later cursed by Lilith, to not ever by able to kill himself, or allow himself to be killed. He will live forever, and any friends, family, or lovers, that he could ever possibly have, will die by his hands.