Ikkuu Ameya, immortal member №10 of UQ Holder, emerged 85 years ago after a life-altering accident at age 13 left him comatose until revived within a fully artificial cybernetic body. Driven by gratitude and a resolve to safeguard his cherished world, he pledged himself to the organization. His appearance defaults to a tall youth sporting a blonde spiky ponytail, clad in a light shirt, dark tie, trousers, and a signature white lab coat, though his synthetic form can shift between age models—from a childlike 13-year-old frame to older iterations—to adapt to missions. Brimming with relentless optimism, Ikkuu radiates kindness, disarming tensions with playful humor and mending both spirits and broken toys for distressed children. Classified as a "Cyberization" immortal, his prowess derives from cutting-edge technology: a weaponized body housing rocket boots, jet packs, arm-mounted lasers, missiles, and extendable robotic limbs. Over 45 years, he harnessed 58% of global computing resources to refine systems rivaling elite immortals like Juuzou. His arsenal includes the Al-Iskandariya orbital cannon—a pactio artifact inherited from Chachamaru Karakuri—that pierces magical barriers with searing orbital strikes. Pivotal engagements span thwarting anti-mage tanks, clashing with Fate Averruncus’s legions, and adopting a youthful guise to infiltrate Amano-Mihashira Academy City, where he aided allies against zombified hordes and brainwashed foes. A critical juncture emerged when his consciousness was uploaded into the internet, leaving him vulnerable to external hijacking and pitting him against former comrades—a stark reminder of his limits despite technological supremacy. Bound by a pactio contract to Touta Konoe, Ikkuu wields an exoskeleton artifact that unlocks modular combat enhancements, cementing his role in UQ Holder’s operations against existential threats like the Mage of the Beginning. His journey navigates the tension between synthetic existence and enduring humanity, balancing mechanical precision with loyalty, empathy, and an unyielding commitment to protect those he holds dear.