Race: Pure-Blooded Devil
Affiliations: 72 Pillars, Astaroth Clan, Anti-Satan Faction (Formerly), Four Great Satans, Satan Rangers (Formerly), Three Factions (Underworld, Leader), Rating Game (Founder), Azazel Cup (Organizer)
Ranking: Super Devil, Satan (Beelzebub), Heir (Formerly), Chief Adviser of Technology
Ajuka Beelzebub—formerly Ajuka Astaroth from the Astaroth branch family—now leads the Underworld and stands as the last remaining Satan after the Evil Dragon War. He's best known as the architect of two massive systems: the Evil Pieces that let devils repopulate by reincarnating other species, and the Rating Game itself. He serves as Chief Advisor for the Technology Department and runs a research institute dedicated to reverse-engineering the Original Satans' ancient tech.
Power & Abilities
Ajuka ranks among the Underworld's heaviest hitters. He and Sirzechs are classified as Super Devils—their raw power actually surpasses the original Four Great Satans and rivals some genuine gods. Zeoticus has noted that their strength alone justified making them Satans, since no lesser position made sense. He famously sat through an entire fight dismantling Old Satan Faction devils (High and Ultimate-Class enhanced warriors) without even standing up.
What sets him apart is his calculation-based demonic power. While most devils channel raw force, Ajuka's specialty is creation through math. His signature technique, the Kankara Formula, lets him control phenomena using equations—he can redirect enemy attacks, reshape them, amplify them, or neutralize them entirely.
He's a master magician who researches demonic spells, particularly those from the original Satans. In his younger days he studied magic calculations obsessively, eventually creating countermeasures against the Jabberwocky and Bandersnatch monsters that invaded the Underworld. He and his team developed magic-circle techniques to stop the rampage.
His real edge, though, is his intellect. Ajuka's a rare breed of genius—only Azazel in the entire Underworld could match his knowledge growing up. Sirzechs has called him irreplaceable. This brainpower translates into three major skill sets: he's a top-tier tactician alongside Falbium, feared across other mythologies specifically for his ability to predict events and outcomes; a master scientist versed in mathematics, physics, and demonic technology since childhood; and a skilled inventor whose creations redefined devil society. He's also a competent politician who helped govern alongside Sirzechs and Serafall while managing relations with the traditionalist Great King Faction.
Like all pure-blooded devils, he can fly on demon wings.
Notable Creations
The Evil Pieces system remains his masterwork—a revolutionary framework that lets High-Class Devils reincarnate non-devils (especially humans with Sacred Gears) into powerful individuals rather than raising weak armies. He's since modified the system to create Mutation Pieces and override reincarnation restrictions.
The Evil Pieces Scanner is a chess-board device that detects abnormalities in Evil Pieces, useful for diagnostics.
The King Pieces are rare variants he designed early in Rating Game history but discontinued due to safety concerns. Only 12 were ever made. The Old Devils stole them when they grabbed commercial control of the Games, though Ajuka eventually reclaimed all of them after they were publicly exposed.
Content compiled by AnimeList.moe from publicly available sources.
