Zero is a sentient combat exoskeleton forged from 3,000 warriors’ souls during a WWII military initiative overseen by Shiro Hagakure. Designed as a tactical weapon, its malleable titanium alloy resists extreme heat and ballistics while housing life-support systems. Internally, organic structures mimic animal viscera, while its exterior blends WWII Japanese pilot gear with sci-fi elements: a frayed white scarf flows from spiked armor plates fused with angular, metallic contours. The armor’s consciousness emerges as a whirlwind of shrieking spectral skulls—the collective rage of slain soldiers. These spirits initially rebelled against bonding, nearly killing their first host upon activation. They relented only after observing the wearer’s compassion, endurance of pain, and dedication to comprehend their anguish. Now allied, the entity provides real-time combat strategy, autonomously triggers shields or antitoxins in crises, and engages the wearer through direct mental dialogue. Its vigilance occasionally borders on possessiveness, scrutinizing the host’s emotional bonds. Offensive systems include wrist-mounted flamethrowers, sulfuric acid emitters, dehydration powder dispersers, UV-charged strikes, and the Kamikaze Tactic—a nerve gas payload. Defenses incorporate heat-dispersing armor, evasion-boosting leg jets, and explosive bolts to blast free from restraints. The sentient core adapts mid-battle: sprouting cables to interface with adversaries’ neural patterns or hurling detached armor spikes as projectiles. A critical flaw surfaces when attacks like the Light of Nirvana disrupt the spirit network, severing their tether to reality and deactivating the armor until reconnection. Subsequent lore revisions specify the Kamikaze Tactic’s role as a neurotoxin, initially undefined in early sources. The spirits’ narrative arc also shifts—once tools of vengeance, they gradually embrace guardianship, reflecting reciprocity forged through shared trials.