How about each race is trying to expand thier power but for that to happen it requires the gathering of the 5 current keyblade weilders, the nobodies want to expand there power by using the keyblade to unlock and get the power of kingdom hearts, in the heartless world the Dark XIII Are trying to kill the keyblade weilders to prevent the nobodies from achieving there goal.
But the heartless goal is to absorb there power so they can expand there power and further advanace there evolution to more human forms and gain cosume the world to make it a heartless pure world.
Aand the humans goal is to protect the keyblade weilders... (Someone can think of this also lol)
Anyone can expand on this idea it is only a idea, if anyone feels like they want to expand or change on my idea then feel free
