Hmm some very nice ideas there I must say. I rather like the Sci-Fi one about the super soldier but I see that's taken.

Having a look at the Fantasy suggestions the one about hunters in an enchanted forest and the one about the dark mage sound very interesting.

Then we come to the idea I really like, I love the idea of an RP set during the Russian Revolution. I have to say after studying it for A-Level History I'm surprised there aren't more games and narratives set during this time period.