Tragedy— romanticism is one of my favourite type of storytelling. The gritty, dark world of realistic proportion with an ever so creepingly disturbing undertone of an out of context problem.
I also love insanely-determined characters, because they are the ones who did the impossible, did the unthinkable, and did the most insane things, even though it is down-right foolish because they held onto their belief——— They will suffer eternally for the sake of one glimpse of their illusionary hope.
There is a certain beauty in self-sacrifice for the sake of 'greater good', especially those kinds of "can quit any time, but if you continued to suffer for an eternity, you might have a small chance of meeting your lover again." suffering.
Absolute despair also works— a hopeless situation of having one's fate decided by an infinitely greater being at whims.
Lastly, I also prefer the dramatic irony that resulted in an unforgivable mistake, irreversible damage, or generally the sudden realisation of the tragic consequence from ignorance.
All in all, I want more permanence in the storyline— permanence loss, lasting consequence— they serve as a reason for the mistake, and also a progression of characters.