Karen Helvetius is one of the oldest and most powerful vampires in the country of Moonlight. She pursues an aggressive policy and expands her empire and demonstrates her powerful forces so that her subjects do not try to overthrow her from the throne. She is very caring to her relatives and shows a special relationship to Terakomari Gandesblad and adores her cute appearance. She is an arrogant, funny, domineering, cunning vampire girl. She is of average height and has a great figure.