Karin Maaka's father, Henry Marker, is a vampire who exhibits surprisingly human traits. He often behaves in a way that could be described as 'silly.' Despite Karin being sixteen years old, Henry still considers her very young.
Regardless of Karin's peculiarities and shortcomings, Henry loves her deeply. This was evident when Karin had her first nosebleed at a human school. Henry risked exposure to sunlight to rescue her from hospital workers who would have discovered her vampire nature, suffering severe burns in the process. He also shows typical paternal jealousy when there's a potential romance between Karin and Kenta Usui.
Henry is frequently overshadowed by his wife, Carrera Marker, but he has a fierce side that he seldom reveals to others. Like most vampires, Henry has a bat familiar with glowing red eyes, though it remains unnamed.
