tell me if this has happened to you. you're working on a story or a character bio for RP (or what have you), and the thoughts and ideas are flowing perfectly. then you realize that a significant part of your work is actually identical to another story that you read in a book, saw in a movie, or played in a game.
this happens to me every now and then with quite a few short stories ive come up with. I'm aware no story or character development can be completely original, despite how different the plot and setting might be, but it's still a bit of a discouragment for me as i wouldn't want my hard work to be generally regarded as a rip-off of X.