Movie
Description
Nurarihyon is the final alien boss of the Osaka mission in the animated film GANTZ:O, which adapts the Osaka arc of the Gantz manga. The character takes its name from a guest deity in Japanese folklore, an association that fits its ghostly, monstrous, and elusive nature. Within the Gantz system, it is the first alien to be rated as a one hundred point heavyweight boss, making it the highest-value target the hunters have faced in the film and one of the most powerful enemies seen in the series.

In the story, Nurarihyon leads a horde of dangerous creatures that attack Osaka, and it is the last and most terrible creature left standing after the other monsters have been dealt with. It is shown as a being without humanlike personality or speech. Its behavior blends a strange playfulness with pure destructiveness: early in the mission it shapeshifts and dances around weaker aliens, seemingly unconcerned with the hunters watching it, before proving overwhelmingly violent once engaged. Its motivation is not explained in the film; it behaves as an instinct-driven predator that exists to kill and be killed, responding to threats with escalating aggression rather than any plan or desire. The struggle against it is presented as a matter of simple survival, either the hunters destroy it or it destroys them.

The creature's most defining trait is its shifting nature. Over the course of the battle it appears in a series of increasingly deadly forms, each associated with a different kind of destruction. It can split its body to dodge physical attacks and multiply into hundreds of duplicates. It can take the shape of an aggregate of female bodies that devours humans and releases corrosive liquid. It can unleash powerful telekinetic shockwaves capable of leveling buildings. It regenerates severed limbs at tremendous speed, so that it can only be finished off when its multiple cores are destroyed at the same time. It can detonate its own body in an explosion that covers the entire battlefield, cover itself in a demonic bone armor strong enough to withstand armor-piercing rounds, and enter a form in which it loses all rationality and attacks everything around it with peak combat power. It is also able to fire deadly lasers from its eyes and to survive wounds that would kill most opponents.

Nurarihyon's role in the film is to serve as the ultimate obstacle for the Gantz hunters. It cuts through the most experienced fighters on the Osaka team and kills Hachiro Oka, the mission's most accomplished participant, even after Oka believes he has won. It wounds the veteran Yoshikazu Suzuki, who protects Kato, and it tears off the arm of Joichiro Nishi. Its final confrontation forces the remaining hunters into a desperate plan. Masaru Kato acts as a decoy while Reika Shimohira and Anzu Yamasaki attack the creature from a distance, and before it dies it kills Yamasaki and leaves Kato gravely wounded. In the end, the decisive strike is delivered by Nishi, who slices the creature in half after it has been weakened, and Kato's killing of Nurarihyon earns him the one hundred points he uses to bring Yamasaki back to life.

As a character, Nurarihyon undergoes no emotional or moral development. Its development is purely physical, with each transformation turning it into a different kind of threat and forcing the hunters to keep changing their tactics. Its relationships are likewise defined entirely by combat. It commands the lesser creatures that assist it in the mission, including the demon Tengu, and it is the shared enemy of every hunter in Osaka, serving as the common threat that pushes the Tokyo and Osaka teams into cooperation. The creature is notable for its power and adaptability rather than any personality, and its presence in the film represents the most extreme challenge the resurrected hunters have encountered.
Cast