Herculus was a demigod his mom human his father was Zeus.If his mom was human and father was an angel it would make him nephelim, which would make him a giant. That has been stated in both the Bible and the book of Enoch. Highly doubt he's nephelim. He might not be reptilian, could be a fallen angel in disguise which makes more sense. I don't know all the different species, but I do think we all co-exist. Nothing is made up.
It was said they had differetn types of kids (half human-half animal etc).