Beelzebumon, originally known as Impmon, is a powerful Mega-level Demon Lord Digimon in the series Digimon Tamers. Starting as a mischievous and troublemaking Rookie Digimon, Impmon evolves into Beelzebumon after a pact with the Deva Digimon in exchange for power. As Beelzebumon, he becomes one of the most formidable and ruthless enemies the Tamers face. However, he undergoes a significant transformation in character, seeking redemption for his past actions and eventually becoming an ally to the Tamers, showcasing his complex and evolving nature.