ONA
Description
Abigail is a significant antagonist and a pivotal character in the Bastard!! manga and the Hell's Requiem anime adaptation. He is a heavily built man with a long, narrow face and dark hair, appearing to be in his forties. Initially serving as the leader of the Four Divine Kings, his actions drive a major portion of the series' central conflict.

Abigail's background is deeply rooted in the world's forgotten history. He was originally one of the Ten Wise Men of Europa, a group of scientists from the advanced civilization of the Old World. Their scientific endeavors, which included the creation of the Spirit Energy Reactor, the God of Destruction Anthrasax, and even Dark Schneider himself, ultimately led to the apocalypse that ended that era. Following this catastrophe, Abigail and his fellow Wise Men transformed into Dark Elves to extend their lifespans. Centuries later, he left the Ten, became a human cleric, and traveled the world as the Dark Prophet of the Underworld before eventually joining Dark Schneider's Four Divine Kings.

His personality is complex and undergoes a dramatic shift. For much of his early appearance, he acts as a sadistic and megalomaniacal sorcerer, obsessed with reviving the destructive god Anthrasax. He plots to obtain the Four Seals that bind the god, promising his allies that he can control its power to create a sorcerers' utopia. However, it is revealed that upon breaking the first seal, his spirit was possessed by Anthrasax itself. Under this influence, his drive for destruction is amplified, and he manipulates the Dark Rebel Army, using powerful spells and artifacts to lay waste to kingdoms. After Dark Schneider destroys his body, the essence of Anthrasax within him is also obliterated. Once he regenerates, his personality becomes calm, stoic, and cooperative, though still somewhat theatrical in his actions.

In his role as an antagonist, Abigail is a major threat who besieges the Kingdom of Judas, breaks Anthrasax's seal, and uses the Blue Nail of the Accused spell to enslave the powerful warrior Arshes Nei. His ultimate goal under Anthrasax's influence is the total annihilation of the world. He combines with the three legendary Demonic Artifacts to transform into the Composite Demonic King, Omega Abigail the First, a gigantic bio-organic suit of armor with immense destructive power and resistance to magic. In this form, he can fire powerful beams like the Abigail Buster, Abigail Beam, and the chest-mounted Abigail Collider. Despite his might, this form has a critical weakness in its exposed energy-collecting membrane.

A key relationship is his complex connection to Dark Schneider. As one of the Ten Wise Men, Abigail is implied to be among Dark Schneider's creators, which adds a unique dimension to their rivalry. After his defeat and liberation from Anthrasax's control, he hides his identity within a mechanical suit and allies himself with the protagonists as the silent samurai Angus Yarn. He later aids them by using his Magic Hammer to restore a shrunken Dark Schneider to his original size and, following the advice of the fallen angel Lucifer, overloads a Spirit Energy Reactor to generate the power needed to revive Dark Schneider from death. This arc transforms him from a genocidal zealot into a powerful, if unorthodox, ally.

Abigail is a master of black magic and ancient sciences. Among his many spells are Heretic, which summons vine tentacles to restrain foes, and the Forbidden spell, which calls forth a horde of death spirits. He wields a tentacle cloak made of living creatures that can act as lightning rods, secure him in place, or immobilize enemies. He also possesses the unique ability Abigail Crystal Power Makeup, a spinning dance that completely regenerates his body and clothing, parodying the transformations of magical girl anime. His skills are not limited to magic; his origins as a scientist give him incredible mastery over machinery, allowing him to develop pilotable robot suits and interface with advanced technology.