I don't want to encourage extra closures and I certainly don't want to close any of the following. In fact I prefer to keep them open.
How would a superhero who needs to fall asleep to use his powers fall asleep during battle? - All about a single individual in a seemingly normal world. No close votes.
How long would it take a body to decay and the bones to fall to the ground from a tree? - About one dead body in a normal world. No close votes.
Reactions to a Young Time Traveller - About a single person travelling to the past. No close votes.
Backpack contents for a modern person stranded in the stone-age - About a single person travelling to the past. Closed because too story-based.
I'll declare an interest in that the final one is my own question. It is what prompted me to ask.
Question
What do the first three questions have in common that make them not story-based and/or character-based that is not shared by the fourth?