Alastor, an electrical demon from Movieland’s Underworld, thrives as a recurring antagonist and rival, driven by his obsession with the "ultimate battle" over loyalty to factions like Jadow or Gedow. Dubbed "Blade Master Alastor" and "The Midnight Thunderboy," he straddles antiheroism, clashing with protagonists while occasionally aiding them. His rivalry with the main hero began in Jadow, marked by coining the term "Viewtiful" during their first duel—a testament to his admiration for their skill, which fuels his relentless quest to prove his dominance. Alastor’s forms shift with his ambitions: the "Blade Master" guise cloaks him in purple spandex, ibex horns, wings, and a tail; the Black Film’s influence unleashes his feral "Underworld Emperor" state; and his Stylish form trades demonic traits for spiked black hair and a sleek suit adorned with a winged skull stole. In the anime, his dynamic with the protagonist evolves into a frenemy bond, blending rivalry with grudging respect. After sacrificing himself to thwart a major foe, he loses his powers, relying on solar eclipses to recharge. Temporarily weakened, he adopts an advisory role, guiding allies despite his limitations. His origins intertwine with the real world as the manifested spirit of a cross-dimensional sword, harboring vengeance against a past abuser. A subplot reveals his rescue of Goldie, twin sister of a central figure, from captivity. Though initially indifferent to her affections, their bond deepens into camaraderie, culminating in a relationship that underscores his capacity for loyalty—albeit framed through his battle-centric worldview. In combat, Alastor merges lightning strikes, swordplay, and borrowed techniques like "Round Trip" and "Air Raid," leveraging hazards like lava pools to outmaneuver foes. He pilots the mecha Rex Majin, rivaling the protagonist’s robotic ally in clashes demanding strategy and raw power. Theatrical and self-aware, he breaks the fourth wall, quipping about screen time or addressing audiences directly—a nod to his existence anchored in Movieland’s filmic reality. Defeats become dramatic exits, punctuated by vows of return, cementing his role as a persistent, honor-bound adversary.