Disclaimer: not mine.
Author's Notes: For xsynthetic-smile's challenge... this is what immediately sprang to mind after I read the challenge, so here it is. Not quite sure about it, but I kinda like it. It's short, but I didn't feel the need to elaborate because I meant it to be short.
You are a Heartless. You skulk in the shadows, preying on hapless souls and stealing their hearts for your own gain. You don't feel pity or remorse, or even feel anything at all except hate and anger and the need to collect more hearts. That's all you know – taking hearts. You belong in the dark. When you rip out someone's heart in a dark alley and hear their anguished screams and smell their terror, you feel a little twinge of something that you aren't supposed to feel. You knew this person, once upon a time…. But that little twinge disappears as quickly as it came, and you forget and your Heartless instincts take over. You were someone, once upon a time. But no more. Now you are the essence of dark.
You are the Keyblade Master – turning Heartless to black ashes with the swing of your mighty blade. You walk in broad daylight, protecting those same helpless people from the fury of the Heartless with your own body, because that's what you have to do. You're a Keyblade Master – that's what you're supposed to do. But no one took your feelings into consideration. Every time a Heartless is felled by your blade, you lose a small piece of your sanity. That very same Heartless could have been your best friend, your mother, or even your brother. You may never know. But you have to keep fighting, because this will never be a once upon a time. You don't have a guaranteed happily ever after. You are the essence of light, but you might end up losing yourself to the darkness.