Oddly quiet, only speaks when spoken to, for example?

[Is she one of those... strange shinki? Like the one that Gojyo has? And Sho's other, more silent one....

Hakkai eyes Kenren dubiously. He finds the very existence of those shinki disturbing. It's as if they lost more than just their memories in the process of becoming a shinki; as if they've lost who they are, too.]

I have seen a few of those around. It must be odd to share a household with one.