Mayuri Kurotsuchi Zanpakuto
Ashisogi Jizo (Leg-Cutting Jizo)

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Wielder

Mayuri Kurotsuchi 12th Division Captain and President of the Shinigami Research Institute, preceded in both by Kisuke Urahara. He personifies the archetype of the mad scientist, viewing everyone as objects to be dissected in the lab. He takes great pride in his experiments and the things he has created (such as his "daughter," Nemu) and condemns the concept of perfection. He has made extensive modifications to his body.

Zanpakuto

Ashisogi Jizo
(Leg-Cutting Jizo): Ksitigarbha is a bodhisattva that watches over children and the underworld. In Japan, where he is known as Jizō, he looks rather like a baby dressed as a Buddhist monk. Mayuri's Zanpakuto's guard is wrapped in a cloth, and has several spiky protrusions sticking out right below the blade, which appear to resemble leaves. The hilt is pink. Unlike most Shinigami, his Zanpakutō's sheath hangs directly in front of him, instead of to his side as they are commonly worn, through a visibly modified hook on the end of the hilt of Ashisogi Jizo.

Shikai: Ashisogi Jizo's Shikai command is "Rip" (kakimushire; "Claw out" in the English dub). Ashisogi Jizo's blade glows and transforms into a deformed trident with curved, serpentine blades, the middle blade is straighter and longer than the side blades and appear to ascend from the guard which is shaped like a baby's head with hands clasped in prayer (as Ksitigarbha is depicted), all mounted on his sword's normal hilt which has more ornate spiky protrusions on either side, which resemble golden leaves right below the guard. The baby's mouth secretes a poisonous vapor in this form at various intervals.
 
Shikai Special Ability: The weapon works like the venom of a spider bite; when an opponent is stabbed by Ashisogi Jizo, it severs the brain signals controlling the neural impulses for movement in the limbs of the victim, regardless of where they were struck. But unlike regular paralysis, the pain receptors and nerve endings are unaffected by the weapon, so the victim can still feel pain, even in a paralyzed limb. During the Bount arc, it is shown that healing the stab wound does not immediately remove the inflicted paralysis

Bankai: Konjiki Ashisogi Jizo (Golden Leg-Cutting Jizo): The Baby's head on the guard opens its mouth as it produces a giant creature with the body of a caterpillar in a red cape with a grotesque golden baby's head and arms with a silver halo hovering around its head, near the back of the halo are 4 bells, 2 on each side. It emits its own individual, red reiatsu upon release.

Bankai Special Ability: The creature breathes a poisonous derivative of Mayuri's blood which is lethal to anyone who breathes it, aside from Mayuri and Nemu. The poison spreads through such a wide area, and it is almost impossible to avoid it. Konjiki Ashisogi Jizo's poison is very potent.

Zanpakuto Spirit Form

Ashisogi Jizo's spirit takes the form of a baby-sized creature with a similar, though smaller, head to its Bankai state. It has regular arms and legs as opposed to the caterpillar-like body that his Bankai  has. It also has wings similar to a butterfly and appears to be capable of flight. There is also a small amount of blue hair on its head. Ashisogi Jizō speaks in a series of garbled beeping sounds and can be heard saying "Bankai" in a very high-pitched voice. Its reason for leaving Mayuri is unknown.

Poison Breath Ashisogi Jizo is able to exhale poison from its mouth. The range seems to be smaller than in Bankai mode.

Paralyzing Retractable Blades Ashisogi Jizo is able to produce retractable blades from its midsection. Upon piercing its target, the area in which the blades strikes becomes paralyzed. However, unlike in Mayuri's Shikai version, the paralysis only affects the target and doesn't sever the brain's connection to the other limbs, as Isane was able to move her arms to swing her sword.