Nephilim perhaps?
They are human/demonic hybrids and I believe I have encountered a few recently.
They have a look of demonic hatred that might even freeze you.
I think there’s a lot of Biblical evidence that your theory is very true. Pray for protection always in Jesus’s Name!
It’s disconcerting isn’t it?
we have been given the same authority that Jesus has to rebuke and stop these demon forces and MUST use it