Laharl is the demon prince of the Netherworld and main protagonist of Disgaea: Hour of Darkness. After awakening from a long slumber, Laharl discovers that his father, King Krichevskoy, has died and his vassals are gone. Proclaiming himself the true Overlord of the Netherworld, Laharl and Etna, his last vassal, set out on a quest to reclaim his throne.
Laharl is incredibly arrogant and self-centered, always trying to prove he is the strongest demon in the Netherworld. This behavior leads to his appearance in almost all following canonical games as a secret boss, where he is obsessing about reclaiming his position as the "main character" or to simply gain more screen time.
In an alternate story, Etna Mode, available on the PSP and DS versions, Etna kills Laharl by accident when waking him up. In order to prevent suspicion from Maderas, Etna places fake antennas on a Prinny and passes it off as Laharl.
Laharl also appears in many other Nippon Ichi Software games, as well as in other games within the Disgaea series.