Fushi begins as an immortal entity crafted by the Beholder, arriving on Earth as a featureless white orb designed to gather stimuli and preserve the world. Initially mindless, it first mimicked a rock, then moss, before stumbling upon a dying wolf whose form it copied. In this wolf shape, it encountered an isolated boy who mistook it for his dead pet, Joaan. When the boy perished, Fushi absorbed his appearance—a white-haired youth bearing a leg wound and rope leash. This form became its default human state due to profound emotional weight. Its early development centered on mimicking human behavior. Meeting March, a girl facing ritual sacrifice, proved pivotal; she named it "Fushi" (meaning "immortality"), teaching it language and tool use. After March died shielding her friend Parona, Fushi absorbed her form and experienced profound grief, exhibiting its first independent emotions. Subsequent bonds deepened its grasp of human connection and loss: the disfigured boy Gugu sacrificed himself to save Rean, and the elderly Pioran acted as its adoptive caregiver. Pioran's eventual death from old age marked another emotional milestone, her soul reincarnating as a horse to aid Fushi. Fushi's core abilities evolved through these experiences. Its immortality grants instantaneous regeneration—recovery time shortened from days to seconds after repeated deaths. Shapeshifting requires potent stimuli, typically from the deceased, granting their physical traits, memories, and skills (like Gugu's fire-breathing or Parona's archery). It later learned to replicate objects it touched, creating anything from food to weapons. Imprisonment in molten iron by the Church of Bennett forced adaptation, allowing replication of extreme heat and metal. A breakthrough came with territory domination: spreading roots globally to sense environments, create bodies or objects remotely, and teleport consciousness. This enabled planetary-scale defense against the Nokkers, parasitic entities seeking to steal its forms and memories. Centuries of isolation followed Pioran's death. Fushi avoided humanity while Hayase's descendants established the Guardian Force cult. Forced back into society by Kahaku (Hayase's reincarnation), Fushi faced theological conflict and imprisonment. The Renril battle against the Nokkers tested its powers: accidentally resurrecting March revealed an ability to revive the dead by recreating their bodies, provided their souls lingered. After Kahaku's Nokker reduced it to an orb, Prince Bon's sacrifice enabled Fushi to regain its forms and fully resurrect allies, solidifying its purpose to create peace. Post-Renril, Fushi slept 600 years, expanding roots worldwide. Awakening in a technologically advanced era, it revived eleven companions, including March and Bon. Confronting modern Nokkers—now microscopic symbionts within humans—posed moral dilemmas, especially through Mizuha (Hayase's 18th reincarnation). After Mizuha's Nokker orchestrated attacks, Fushi rejected the Beholder's offer of omnipotence. The Beholder, now a boy named Satoru, confessed to creating the world out of boredom and transferred guardianship to Fushi before relinquishing his memories. Sixty years later, Fushi departed with its companions to continue its eternal mission. Its personality shifted from passive mimicry to empathetic agency. Early interactions saw it misunderstand social nuances, laughing inappropriately or speaking bluntly. Witnessing repeated deaths—especially March, Gugu, and Tonari—instilled a deep aversion to pain and killing, driving its pacifism. Conflicts with Nokkers and humans, like Jananda's violence or Kahaku's manipulation, forced ethical refinement, balancing mercy with resolve. By the modern era, it displayed complex autonomy: refusing godhood to preserve free will, liberating cybernetic beings from immortality, and creating bodies for allies like Mizuha's clones. Its final act was releasing companions after centuries together, continuing its journey alone.