Ultimate Mechamaru is a mechanical humanoid puppet forged as the remote-controlled proxy of Kokichi Muta, a Kyoto Jujutsu High student whose Heavenly Restriction left his body fragile and immobile, compelling him to rely on puppetry for daily life and combat. Operated via Puppet Manipulation, Mechamaru mirrors a teenage male with a sleek robotic design: lines etched across its head, a forehead swirl, and a Jujutsu High uniform paired with a scarf. Kokichi’s immense cursed energy—granted by his Restriction—enabled remote control of multiple puppets over vast distances. Combat-ready Mechamaru unleashes searing cursed-energy lasers from its palms, morphs limbs into blades or shields, and propels itself with elbow jets. Swift techniques like Sword Option, Ultra Spin, and Boost On amplify its offensive-defensive agility. The concealed Mode: Albatross reveals a mouth cannon for the devastating Ultimate Cannon strike. Desperate for a normal existence, Kokichi covertly bargained with Mahito and Kenjaku, trading Kyoto High intel for physical restoration, on the condition his peers remained unharmed. This pact led to a climactic clash with Mahito, where Kokichi activated Ultimate Mechamaru Mode: Absolute—a towering armored form piloted from a cranial cockpit. Harnessing 17 years, five months, and six days of stockpiled energy, it executed techniques like the annihilative Miracle Cannon and homing Pigeon Viola missiles, while its integrated Simple Domain countered enemy Domains. Though briefly empowered to confront Mahito in his healed body, Kokichi perished. His lingering energy later materialized as a mechanical guide during the Shibuya Incident, directing allies through chaos. Kokichi shared quiet mutual affection with classmate Kasumi Miwa, leaving her a final plea to seek joy. His rivalry with Panda, a sentient cursed corpse, stemmed from envy of its autonomy despite their shared artificiality. Mechamaru’s fusion of tactical engineering and cursed techniques embodies Kokichi’s genius, mirroring his struggle to overcome frailty through innovation. His arc intertwines sacrifice, moral ambiguity, and the yearning to transcend bodily confines through cursed energy’s perilous potential.