It could have to do with the fact that Xemnas had done away with the name, that was possibly part of it, and many people knew his name.

"Oh...well..." Demyx hesitated a little bit over what they did. He tended to gloss over that because it sounded really bad objectively and all the nice, normal people knew bad things when they heard it.

"The Superior had us collecting hearts to form Kingdom Hearts. It's supposed to restore balance to the worlds and get us our hearts back."

That sounded somewhat like the story one told a child, as an overview of what they did.

"Nobodies are..." He paused, this time to think, not so much for hesitation purposes. "When someone with a strong heart loses theirs, a shadow is made, and a Nobody. The thirteen of us had the strongest hearts because we're the only Nobodies that look and act like people, if you want to think of it that way. But don't worry, he says we're not."

Monsters was probably a better way to put it.

"Oh, uh, Demyx." He smiled a little. "Or Number Nine, the Superior uses that a lot. He named me. You did. I mean. Older you. I'm confused."