[Roxas doesn't get it, and he frowns at Ikki, confused.]

Heartless are black creatures with no hearts that steal hearts. Nobodies are almost like people. They usually remember who they used to be. Axel was always telling me stuff. I don't have any memories from before though.

[He frowns a little. Did he know what it means?]

Well. I don't have a heart so I don't really understand, no.