Laharl~ Prince of the underworld. He brings chaos to the netherworld.
Flonne~ A fallen angel. She has made it her goal in her life to nurture the feelings of love that is carried in the hearts of demons. Everyone can love, even a demon.
Etna~ A vassal to the King. Although she seems to be the opposite for herself, she wishes for Laharl to be a kind ruler much like his father. Her hopes seem to start coming to be true when Flonne appeared, and started changing the shape of Laharl's heart.