honestly, it's hard for me to hate protagonists since I mentally try to project myself into their shoes and see myself doing pretty much everything they do, so yeah, I can't understand the hate on Shinji since I'm willing to bet that if anybody was suddenly taken from a peaceful life, given a weapon and told to kill, not some long range weapon like a gun where you can't see the death but a full close-combat weapon of mass destruction, would affect them in negative ways no matter how desensitized you think you are. Killing in a game or watching it happen in movies does not take away the effects it has on you if you have to be the one to shove a knife into someone's throat.
Honestly, I don't see why everyone labels a character who has emotional issues as emo - emo has to do with having suicidal thoughts or at the very least having totally negative views on life and existence, so an emotionally disturbed character or person is not always emo.
But as for the OP, I would have to go with the girls in Hostel 2,
especially the first one since she's pretty much the type that would fall for any cheap romance line and disregard any sound advice from her friends, go off with a total stranger she met 20 seconds ago to a secluded place and then get kidnapped and tortured to death.
EDIT: Lorna was her name