Board Thread:General Discussion/@comment-27907368-20160412010659/@comment-26887879-20160508131723

I think Gerson knows we're human, since he's one of the oldest characters we meet, he doesn't seem surprised when we do Genocide route, he's been trough a lot...

It's funny how Asgore can't tell if we're human or not buy the end of Genocide route, but that might be symbolic as well... But yeah, some monsters recognise us as human, some don't. Alphys and Sans probably do because of their scientific background, and Undyne because Alphys told her so, but who knows...