Story/Plot
Every RP needs a storyline. Give your storyline a point in what is happening or what is to happen within it. Without a storyline, a RP has no function. Feel free to use the example as a use for a storyline if you should come to it.
Example:
The year is 2049...Humanity is at its end. Aliens attacked Earth after deeming them uncivilized because of their rash ways. The humans, though their weapons are effective, have died out to near extinction. The last remaining humans hide underground as the aliens repopulate earth and claim it as their own. Soon the aliens will attack the humans to kill them off before they can repopulate too. It is your job as a human to protect your fellow humans and fight off the alien forces whom wish to kill you.