You can use this to plot together with others and to find connections for your characters without specifying what you are looking for (use the "Looking for:" forum, otherwise) plus working out their mutual past and how they met each other if they are not related.
Not sure if a story or character you have in mind is actually interesting for others? You can put ideas here and ask others what they think of them or if they would be interested to join a certain story you have in mind. You can also brainstorm ideas together if you alone do not have enough of your own.
Pre-made characters that can be taken by other players. They can either be filled out almost completely or be mostly ambiguous. If you are not sure what character to make, you might find an interesting one here.
Welp, there's a lot to do but I got the feeling that it will be worth it.
Status updates like this can be used by any member for almost anything, like what's happening around you, what you're thinking about etc. Only OC, though