User blog comment:B214/Volume 22 spoilers/@comment-86.149.139.182-20160922165951/@comment-9595671-20160923030448

I'm pretty sure that the only way to hide your from the supernatural is to know of such powers and use aura supressing. So if you don't know you have that potential you can't hide it.

So I think that helps confirm that not just Kiryuu but any person in Kuoh we've met before now is a normal human being.