(*Note: This is a legend from the Persona 2 duology and has no historical parallels.)
Hellsehen is a member of the Last Battalion that are apart of a special force that deals with bacteriological weapons.
"An original demon appearing in "Innocent Sin." A member of the Last Battalion, they appear to be part of a special force that deals with bacteriological weapons. ※This profile is a work of fiction based on in-game information."
—Persona World
Hellsehen is a member of the Last Battalion. It appears to be an upgraded version of Virulenz Kraft.