[Xacual]

Originally Posted by Keroko

To expand on this with some author spoilers (Note, as far as I know this is only what the author has revealed and has yet to feature in any of the novels or manga):

Spoiler for Author's sneak peak:

At least one of Shiroe's alts has gained sentience and will eventually make an appearance.

That's not what he said.

Spoiler:

All he said was that Roe2 would come up in some way later. Nothing about gaining sentience.