Beelzebub

A Christian demon, reminiscent of a scientist or monk, dressed all in black. Known as "the god of fertility" and "the demon of flies," he has two personas as the anomalous god "Baal Zebub," also called "the lord of flies" and "the cursed by Satan." Beelzebub is disliked by other gods because being involved with him leads to misfortune due to his destructive impulses, which destroy his loved ones when his love reaches its limits, called "Diabolic Impulse of Life Destruction (Destruedo)."

A mad scientist with exceptional skills in heaven, he conducts various research to find someone who can kill him. He implanted the seed created from the residue of the demon Hajun left in the underworld into Zerofuku. The choice of Zerofuku as the recipient was random, as he was just fitting at the moment.

Once rumored in heaven as "the cursed by Satan (Anadema)," Beelzebub spent lonely days shunned by others until Lucifer, Azazel, and Samael, who took interest in him, were killed. Convinced that Satan was the murderer, he began his research to find Satan's true identity. During his journey through heaven and the underworld with Lillith, a childhood friend of Lucifer, he witnessed himself killing Lillith and realized that Satan had always been inside him. After apologizing to Lillith, who told him to live on for their sakes too, he inherited her tattoo. He then went to the underworld to find someone who could kill him, only to lose to Hades. Hades informed him that his inability to die was not a curse but due to Lillith's prayers, leading Beelzebub to decide seeking the vilest death as atonement.

A master of combat in the underworld, Beelzebub possesses the ability "Devil's Flutter (Valmura)," which allows him to manipulate vibrations, specializing his left hand in defense and his right in offense, maximizing his combat capabilities. His divine weapon, a staff with a skull called "Apomyuios's Staff," enhances his vibration abilities, making it both a weapon and armor. Acquired from Hades, this weapon was praised by Hermes and Brunhilde as granting him the ultimate spear and shield capabilities.

After the seventh battle, Beelzebub stopped Adamas from avenging Hades by killing Brunhilde, warning her and the gods of their uncontrollable impulses to destroy humanity. He then instructed Hermes to inform Zeus that he would participate in the eighth battle.

During his fight with Tesla, reminded of Hades, Beelzebub felt he had become more troublesome than the already difficult Hades. Witnessing Hades' death shifted his true desire to destroy humanity. Ignoring his own life, he cornered Tesla using a forbidden move "Hollow God," driven by the belief that stopping him meant adhering to Lillith's tattoo's wishes. Trusting that Tesla's final attack wouldn't be unsophisticated, he anticipated and incapacitated Tesla, securing his victory. After the match, he reflected on the gods praising him while considering how gods and humans are not so different, leaving the arena in contemplation.