Accelerator is a pale-skinned teenage esper with white hair and crimson eyes, his albinism stemming from an ability that blocks ultraviolet radiation and disrupts melanin production, accentuating an androgynous appearance. His power automatically manipulates vectors—controlling directions and magnitudes of physical phenomena—enabling him to deflect attacks, command wind and plasma, reverse blood flow, and warp gravitational forces. This requires continuous subconscious calculations, initially sustained by his innate processing power but later aided by an external electrode linked to the Misaka Network after a head injury diminished his computational capacity. Raised in Academy City’s clandestine programs, Accelerator endured childhood isolation due to uncontrollable powers harming others. A military confrontation at age ten solidified his distrust of others, further shaped by mentor Kihara Amata’s ruthless teachings. Participating in the Level 6 Shift Project, he slaughtered 20,000 clones of Misaka Mikoto, initially believing fear would deter challengers. After clashing with Kamijou Touma, who halted the experiments, he recognized the clones’ humanity. Post-experiments, Accelerator’s purpose shifts upon meeting Last Order, a Misaka clone serving as the network’s control tower. Protecting her drives him into conflicts with groups like Disciplinary Action and Academy City’s covert operations. His dependence on the Misaka Network via a neural electrode introduces critical weaknesses: limited battery life and susceptibility to signal interference underground. In later conflicts, he confronts remnants of the Dark Side, including Kihara Amata’s legacy and threats to Last Order. His abilities evolve during extreme stress, manifesting wings of dark matter or Telesma that grant flight and heightened destructive power. Though self-identifying as a villain, he increasingly intervenes to shield vulnerable figures like Fremea Seivelun, collaborating with allies such as Yoshikawa Kikyou and Yomikawa Aiho. As Academy City’s Board Chairman, Accelerator balances strategic governance with personal missions, torn between atoning for past sins and employing calculated violence against threats. Interactions with Touma and the Sisters Network underscore his internal conflict—rejecting heroism yet striving to prevent others from replicating his mistakes. Key relationships include a paternal bond with Last Order, adversarial respect for Touma, and uneasy alliances with former foes like Kakine Teitoku. His combat style merges brute-force vector manipulation with tactical firearm use and equipment like a gravity-sensor-integrated cane. Psychological traits reveal cynicism, self-loathing, and sardonic wit, masking vulnerabilities rooted in loneliness and a yearning for connection. Spin-offs like *A Certain Scientific Accelerator* depict him dismantling conspiracies targeting Last Order, demonstrating resourcefulness despite physical limits. The *Miracle of Endymion* film and later novels illustrate his reluctant heroism during global crises, maintaining a detached demeanor. Chronic scars from the Level 6 Shift Experiment and battles shape his pragmatism and emerging moral code, framing his arc around redemption, power dynamics, and ethics in science within Academy City’s socio-political web.