The Halo Guardian is first encountered at North Ryoshima Coast, in a Demon Scroll in the area. The Halo Guardian, true to its name, is a headless Jizō, carved from stone. The demon wears a robe commonly donned by Buddhists. The statue, however, doesn't have a head, being its most prominent feature, and what is left of its neck stub is a spiral of a spinal cord carved in the neck. To enable the Halo Guardian the ability of flight, there is a wooden halo on its back, which is spun to grant propulsion against the ground and keeps the demon airborne (similar to a helicopter's rotor).
The Halo Guardian, unlike other demons of the Guardian type, is not a Buddha statue at its origins, but instead was a plain demon who took the appearance of a statue. With its halo, human are convinced that the Halo Guardian is of a sacred status. Only when observed at close that this creature is revealed to be an imposter. Also, legends hold that a devout old couple was attacked by the Halo Guardian, but a sacred gust of wind saved them from certain death.
"Halos are normally seen radiating from Buddhist statuary, but this
creature has stolen that appearance and uses it to harass humans.
Its holy appearance is convincing, but a closer look reveals no head.
One tale tells of a devout old couple who were attacked but saved
by a divine wind. A strong heart will tell you this is an imposter."