It's the Mid-Boss! I mean The Dark Adonis, Vyers! Mid-boss tends to turn up where ever Laharl and his vassals go. He likes to charm the ladies but always fails. Though Vyers is still a good man and stops Laharl from making a huge mistake near the end of the series.    ~!In the end of last chapter of manga he indirectly reveals that Laharl is his son so he also might be...!~

From the darkest realms of another dimension emerges the story of Laharl, the son of a demon overlord, and his two sidekicks: his impish servant and an angelic assassin. Awoken from a two-year, poison-induced nap, Laharl learns of his father&rsquo;s demise and blazes a trail of destruction on his quest to declare rule over the Netherworld. Never skimping on the wisecracks, the diabolical prince and his accomplices battle dragons, sorceresses, robots, power-hungry humans, and corrupt angels. 
Based on the popular adventure games, Disgaea lunges at you with a full-force attack. You can laugh, cry, scream or squirm, but you can&rsquo;t escape the wrath of Laharl, dood! 
(Source: FUNimation)

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So... you wake up one day after a two-year nap and discover that your father is dead. What do you do? Take over his kingdom and rule with an iron fist, of course! 
Laharl may be new to the whole Overlord scene, but with the help of the demon-girl Etna and the angel-ditz Flonne, hefs going to be the best ruler the Netherworldfs ever seen. All he has to do is get by the hordes of halfwit hellions determined to challenge him for the throne, foil an interdimensional plot and keep his own vassals from trying to kill him. 
Sound rough? Hell yeah. (Source: Broccoli Books)