How are nobodies created?

How are nobodies created? The Nobodies (in Japanese: ノーバディ, Nōbadi) are dark creatures that are the result of strong-willed people becoming Heartless; they are the empty shell that is left behind after the hearts are taken. They first appear in Kingdom Hearts Chain of Memories.

The Nobodies (in Japanese: ノーバディ, Nōbadi) are dark creatures that are the result of strong-willed people becoming Heartless; they are the empty shell that is left behind after the hearts are taken. They first appear in Kingdom Hearts Chain of Memories.