My idea:
Survival RP:
This is simple. Your goal in this is to survive as long as possible. Don't worry, I'll give out enough information, so you can survive.
Players may join mid-RP.
Characters may be created and added at any time.
So, get characters to throw around, and survive.
Three things:
1. There have been these portals through time, and interdimensional portals, pulling all the characters together in the same area. That means...make up anything as a character.
2. If you survive for long enough, this will get a bit more interesting.
3. Don't expect the mortality rate to be low.
Those of you who look at the DDF, you may recognize this. Don't worry, it will be quite different from the DDF one.
It will still be dangerous for the characters, though.
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Carp. Carp. Carp.