TV-Series
Description
Ōetsu Nimaiya, also rendered Ouetsu Nimaya, is a member of the Royal Guard known as the Zero Division in the Thousand-Year Blood War story arc. He holds the title God of the Sword and the position of Third Officer of the Zero Division, along with the designation Divine General of the West. He is recognized throughout Soul Society as the inventor of the Zanpakutō, the weapon used by Shinigami, and as the craftsman who personally forged every Asauchi, the blank sword that gradually becomes a Shinigami's individual Zanpakutō. Because his invention was considered essential to the protection of Soul Society by the Soul King, he was elevated into the Royal Guard. Since the founding of Soul Society, no Shinigami has awakened a Zanpakutō without using one of his Asauchi; the notable exception among those who trained with him was Ichigo Kurosaki, whose original blade was not one of Nimaiya's creations. Nimaiya later forged a new sword for Ichigo during the training that took place in the Royal Palace.

In appearance, Nimaiya is a dark-skinned man with thick black hair that is shaven and dyed green on the sides of his head, giving him a distinctive reggae-influenced look. He wears a variation of the standard Shinigami robe, featuring a green undergarment and a shortened hakama that leaves his lower legs exposed. His behavior matches his unusual appearance. He is flashy, energetic, and laid-back, prone to grandiose entrances and elaborate greetings, and he speaks in an exaggerated, self-promoting manner, frequently calling himself the number one Zanpakutō creator and describing his sword as delivering a one-slash kill. Kirio Hikifune, a fellow member of the Zero Division, describes him as unpredictable. Despite his eccentric public persona, he keeps a clear separation between his personal flamboyance and his professional responsibilities, and he approaches his craft with seriousness and pride. He is also quick-witted and resolute when the situation demands it.

In terms of motivation, Nimaiya is driven by dedication to the art of swordmaking and by his duty as a direct protector of the Soul King. He takes great pride in having created the weapons that define the Shinigami, and he treats the forging and reforging of swords as a serious responsibility. His training of Ichigo and Renji Abarai reflects this outlook: he pushes them to understand the true origins of their own souls and weapons, and he sends Ichigo back to the living world with the lesson that knowing one's roots is essential to wielding power properly. When fighting, he shows a merciless and efficient style, adapting quickly to his opponents and delivering swift finishing blows.

During the invasion of the Royal Palace by Yhwach and the Wandenreich forces, Nimaiya becomes one of the central defenders of the Soul King. Standing against the Schutzstaffel, the elite personal guard of the Quincy, he single-handedly cuts down three of its members: Gerard Valkyrie, Pernida, and Lille Barro. When he then faces Askin Nakk Le Vaar, whose Deathdealing ability makes Nimaiya's own blood toxic to him, he reacts by slitting his own throat and relying on fellow Zero Division member Tenjiro Kirinji to replace his blood, which allows him to overcome that opponent as well. He is ultimately defeated when Yhwach's Auswählen revives and empowers the fallen Quincy, and an invigorated Lille Barro badly injures him.

Nimaiya's key relationships are defined by his position within the Royal Guard. He serves alongside the other members of the Zero Division, including Ichibe Hyosube, Kirio Hikifune, Tenjiro Kirinji, and Senjumaru Shutara, and he works closely with Kirinji during the battle against the Schutzstaffel. He acts as a mentor to Ichigo and Renji during their training in the Royal Palace, and he is attended at his palace by a group of women who are revealed to be manifested Zanpakutō rather than Shinigami, a fact that surprises his visitors because they are indistinguishable from ordinary spiritual beings. He refers to them with casual familiarity, calling one of them Mera-chan. His most significant relationship, however, is with his own blade.

Nimaiya's main weapon is the Zanpakutō Sayafushi, a name that can be rendered as Sheath Dodger. The blade is so sharp and so smooth that it never chips, dulls, or even retains a drop of blood, and for that reason no sheath can be made for it. When it is not in use, he keeps it suspended in a vat of jelly. He considers the sword a failure, because in his view a blade that cannot be sheathed is no longer a proper sword. Nevertheless, Sayafushi makes him an exceptionally dangerous fighter, and in the Royal Palace battle he demonstrates the ability to kill formidable opponents with a single stroke. Beyond his personal combat ability, Nimaiya is the only individual capable of reforging broken Zanpakutō, and he knows the location of every Zanpakutō he has created. He is also able to forge blades that possess their own will and consciousness, as demonstrated by the sword-women who serve him in his palace.

Within the Thousand-Year Blood War arc, Nimaiya shifts from an eccentric craftsman figure into one of the most decisive fighters among the Soul King's protectors. His lighthearted manner in peacetime contrasts sharply with the ruthlessness he displays in battle, and his defeat at the hands of the revived Schutzstaffel illustrates the scale of the threat that the Quincy elite pose even to the highest-ranking Soul Reapers. His lasting legacy within the story is the Zanpakutō system itself, which shapes the power of every Shinigami in Soul Society.