Ubuginu Hikone

A young Shinigami with an appearance that could be mistaken for either a boy or a girl, characterized by short hair, dark skin, red eyes, and coral pink robes resembling a Shihakusho. Their behavior is as youthful and innocent as their appearance, though they also display ignorance and a harsh side. They deeply respect Tokinada as their master, and their extreme loyalty drives them to attempt suicide when they feel they have failed him. Despite their lack of experience, they possess high combat abilities, with physical capabilities comparable to Toshiro Hitsugaya during his fight with Harribel, combined with the Hierro of an Arrancar and the Blut of a Quincy, emitting a captain-level spiritual pressure. They also show abnormal growth potential reminiscent of Ichigo.

Their true nature is a vessel for the Soul King, secretly created by Tokinada, forcibly assembled by Aura, using multiple "Fragments of the Soul King" stolen from Fullbringers as a core, and tens of thousands of souls from humans, Shinigami, and Quincies using Gremmy's brain, shaped into a self-aware Shinigami. Given the name "Ikomi Kidomoe" by Tokinada, they intervened in a battle-ready state between Harribel, who was aiming to become the "King of Hueco Mundo," and Liltotto's group, engaging both sides but was forced to retreat due to severe injuries. After retreating, they encountered Hisagi and Hanataro, fought and lost to Hisagi, realizing they had much to learn and were not strong, but were attacked by Ikomi Kidomoe due to running out of spiritual energy and were saved by Aura, receiving treatment from Kiyonosuke.

After the turmoil, they reformed and now live in a charcoal hut in a corner of Rukongai.

Zanpakuto: "Ikomi Kidomoe"

A biological-type Zanpakuto sealed in the Sword Tower at the bottom of the Phoenix Palace, described by Wang Yeyu as a blade that "cannot be wielded by the weak," with a blade eerily painted white. It has the ability to transform into different forms with each release command, each time becoming stronger, while the owner's soul is eroded by the Hollow factor.

Its true identity is an ancient Hollow on par with Baraggan, a unique individual that evolved differently from other Hollows and Arrancars (combining the size of a Gillian, the mutability of an Adjuchas, and the density of a Vasto Lorde). It once attempted to invade and devour the Soul King but was repelled by the Zero Squad. Due to its uniqueness, erasing it would disrupt the balance of all souls, so its true name was sealed by Ichibei and it was sealed in the form of a Zanpakuto. Being originally a Hollow, it can move using black cavities.

Release command: "Circle the stars, Ikomi Kidomoe"

The blade transforms into an arm-like appearance of a Hollow, moving independently from Hikone to mow down surrounding enemies.

Release command: "Record the funeral, Ikomi Kidomoe"

Transforms into a giant form surpassing a Gillian-class Hollow. Merely roaring generates tornadoes, and it can produce countless clones from its body, referred to as "a nation's worth."

Release command: "Hatch and perish, Ikomi Kidomoe"

Shrinks to the size of a house while condensing its spiritual pressure into a monstrous form, surpassing even Baraggan. It emits a powerful "Cero" in all directions from a single eye and can use the high-speed movement technique of the Arrancars, "Sonido," while maintaining its massive mass.