Riku's song takes place in...either 358/2 Days or KH2...I'm not certain which one. I do not own the characters, but I own the lyrics!
Riku crept forward through the dark corridor, peering out from underneath the hood of his black cloak. He stepped out of the swirling portal into the open square in Twilight Town. It was night, or course. He didn't move when several Heartless popped out of the ground: he knew they wouldn't attack him.
But he almost wished they would. Why was he becoming more like them: a being of darkness? He stood there for a moment, lost in thought, but then, naturally, he began to sing.
Riku: Darkness, darkness, in my soul
Darkness, darkness, I control
Why is darkness the only place
Where I seem to belong
I thought that I could somehow escape it
Why must I be wrong?
The Heartless around him began to sing too, in thin, scratchy voices.
Riku + Heartless: Darkness, darkness all around me
Darkness, darkness, hold and ground me
Darkness is my ruling master
Riku: To run away, I must be faster
Riku + Heartless: Darkness, darkness, is all I see
Darkness, Darkness, set me free
Darkness wind and darkness bind
The dark is all I know!
Riku fell silent, and the Heartless drifted away until only he was left, still alone, in the dark.