Kairi's Journey: Into the Heart of Shadows

The Heartless; once, they were not the monsters hell-bent on destroying the Light, but merely it's ally and protector. A man bent on gaining the one true Kingdom Hearts dethroned the one who once governed all Darkness and corrupted it, leaving the once hardened king shattered and broken of all hope, to drift into the void. When Sora defeated Ansem and locked the Door with Riku and Mickey inside, he set off a chain of events; events that wouldn't leave Kairi so lonely for long...

This might end up being an OCxKairi thing, might not. One way to know for sure is to read along and gimme some insight on what you might think happen next, and I might add it; along with giving credit where it is due.