[Video]
A Nobody is what's left of a strong person after they turn into a Heartless. I'm Sora's Nobody. I think he was a Heartless for a while, but he got -- better. [apparently?]
But most Nobodies remember who they used to be and I don't remember anything about Sora, so maybe that's why you don't remember him either. [he might be going on a little ahead here]