Shadow People are still a mystery in the paranormal community. They are often seen where a shadow should not be, and many theories have come and gone. Some say they are demons or evil spirits, and some may very well be, as both have been known to appear in such a manner. But there seems to be a separate class for these shadow entities.
For example, some are seen with red eyes...these could simply be demonic or evil spirits, but often shadow people are seen with a tall black hat, which seperates them from the others. Others have said perhaps they are inter-dimentional beings. But in the end, it's still a mystery as to their identity.