Because why not.
1) Make a list of fifteen characters first, and keep it to yourself for the moment.
2) Ask your f'list to post questions in the comments. For example: 'One, nine and fifteen are chosen by a prophecy to save the world from four. Do they succeed?' 'Under what circumstances might five and fourteen fall in love?' 'Which character on the list would you most want on your side in a zombie invasion?' 'Write a drabble in which three and eleven fight crime.' (...possibly not technically a question.)
3) After your f'list has asked enough questions, round them up and answer them using the fifteen characters you selected beforehand, then post them.
2) Ask your f'list to post questions in the comments. For example: 'One, nine and fifteen are chosen by a prophecy to save the world from four. Do they succeed?' 'Under what circumstances might five and fourteen fall in love?' 'Which character on the list would you most want on your side in a zombie invasion?' 'Write a drabble in which three and eleven fight crime.' (...possibly not technically a question.)
3) After your f'list has asked enough questions, round them up and answer them using the fifteen characters you selected beforehand, then post them.
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Would eight be able to successfully run a blog?
Who would you consider the most suicidal between six and five?
There is only one bed in the room - do twelve and one share it or does one of them sleep on the floor?
If nine was going to write a book what would it be about?
Fifteen and two get drunk and decide to trash three's house, how does that end?
What sort of music does thirteen listen to?
How good would eleven be at stalking ten?