**Optimized Character Description:** Born Edward Alexander Crowley, Aleister endured a difficult childhood under devout Christian parents who dismissed his lack of faith. Sent to a strict boarding school, he faced persecution from teachers and peers, fostering deep bitterness toward those claiming righteousness while acting disgracefully. This early disillusionment with organized religion and societal hypocrisy shaped his contempt for the concept of God, whom he deemed incompetent for failing to punish deceitful individuals. His quest for truth led him to reject blind faith and seek alternative understandings of the world's rules, drawing him inevitably toward magic. During the late 19th century, Aleister joined the Golden Dawn, the world's largest magic cabal seeking a unified theory of existence. Internal conflict existed between founders William Wynn Westcott and Samuel Liddell MacGregor Mathers, with Mathers recruiting Aleister for his potential. Within the cabal, Aleister developed revolutionary magical concepts, though some like his Aeons theory faced opposition. His sole genuine ally was mentor Allan Bennett, who taught him Spiritual Tripping and revealed the true power of the Blasting Rod. Bennett prophesied the death of Aleister's unborn daughter Lilith due to "phase sparks"—collisions between metaphysical layers of reality intensified by unified magical theories like the Golden Dawn's. Despite knowing their activities fueled this phenomenon, the cabal continued its work. Resolving to protect his future child, Aleister reluctantly killed Bennett, who willingly accepted death as a Golden Dawn member, and launched an attack on Mathers. This culminated in the Battle of Blythe Road, where Aleister secured the cabal's treasure—an arrow crafted from a right hand bearing Imagine Breaker. Lilith's death solidified Aleister's hatred for magic and the Magic Gods whose existence perpetuated the phase system governing fate. He abandoned magic to pursue science, founding Academy City as a technological haven to develop espers. As the city's Board Chairman, he resided inverted in a life-support tube within the Windowless Building, orchestrating countless plans from the shadows. His experiments, including the Level 6 Shift Project involving the mass-produced death of Misaka clones, served dual purposes: advancing scientific understanding while strategically failing to further his ultimate goal—destroying all magical phases to restore the "pure world" free from supernatural influence. This vision involved creating an Artificial Heaven through AIM diffusion fields to eradicate magic globally. He established the Science-Side truce to prevent magical interference in Academy City. Aleister embodied extreme contradictions: masculine yet feminine, saintly yet criminal, adult yet childlike. His personality blended cold rationality with deep-seated emotion. He approached plans with ruthless efficiency, viewing success and failure equally as tools to advance his goals, a philosophy rooted in his Thelema-based mantra: "Do what thou wilt shall be the whole of the law." This detached pragmatism masked profound grief over Lilith's death and insecurity stemming from lifelong rejection. Though he claimed to value human life, he sacrificed individuals without hesitation if they opposed his objectives. His later actions revealed protective instincts toward protagonists like Kamijou Touma and Accelerator, whom he appointed as his successor. After merging with the demon Coronzon during a confrontation, Aleister's consciousness fragmented into billions of parallel possibilities, manifesting as diverse physical forms. His primary manifestation emerged as a silver-haired young girl with pale skin, wearing a witch-like hat and cloak, displaying a more playful and mischievous demeanor while retaining his core motivations. His magical expertise earned him the title "greatest magician in history." Key abilities included Spiritual Tripping—invisible illusion weapons that bypassed defenses to inflict real damage exclusively on chosen targets—and the Blasting Rod, which amplified spell potency exponentially with each encounter against the same foe. He could summon "Crowley Hazards," manifestations of his alternate possibilities, and sacrifice them via Blood Sacrifice to enhance his power. His Archetype Control allowed manipulation of modern Western magic's foundations, though this had limitations against unrelated traditions. He also utilized technomagic interfaces like the UNDERLINE nanomachine network for omnipresent surveillance within Academy City. After the fragmentation incident, Aleister allied with former adversaries like Touma to combat Coronzon. His plans consistently adapted to unforeseen variables, such as Shiage Hamazura's survival or the emergence of the World Rejecter power. Despite setbacks, including a curse of perpetual failure from Mathers, Aleister persisted in his quest to eliminate magic, protect his fragmented consciousness across realities, and honor Lilith's memory by creating a world where human will dictated destiny without supernatural interference.