Ikomikidomoe

is the name given to an ancient Hollow that was turned into a Zanpakutō by Ōetsu Nimaiya

Appearance
In its sword form, Ikomikidomoe is pure white, almost glowing, large broadsword with black spots on it.

In its Hollow form of its second release, Ikomikidomoe is a giant, humanoid creature with a long torso and elongated arms which reach almost to the ground. Its forelimbs end in large claws, while its legs are much shorter. Ikomikidomoe does not have a discernable neck; instead its head is an extension of its body. Its forehead is covered in hexagonal markings, while a structure extends from its nose back across its cheeks, ending in large circles just beside the hexagonal markings. A long beard extends from beneath its nose.

Personality
Ikomikidomoe is quite prideful and arrogant, and is insulted when regular Shinigami even voice the possibility of being on the same level as its current wielder. Likewise, Ikomikidomoe ridicules the mere idea of an Arrancar as young as Grimmjow Jaegerjaquez wanting to be the ruler of Hueco Mundo. Despite this, Ikomikidomoe does have respect for Baraggan Louisenbairn to some degree, and was mournful when it heard the other Hollow had perished.

Ikomikidomoe also appears to have misogynistic beliefs, as it instantly assumed Tier Harribel and Nelliel Tu Odelschwanck were mere "maidservants" of Baraggan's court, rather than the powerful rulers they actually are.

History
A long time ago, in the primeval days of Soul Society, the Hollow that would become Ikomikidomoe was an exceptionally powerful Adjuchas Hollow. Due to Ikomikidomoe's potential it was respected even by Baraggan Louisenbairn, and the two made a pact never to interfere with each other.

At some point in the past, Ikomikidomoe attacked Soul Society and even defeated an young Genryūsai Shigekuni Yamamoto, before attempting to devour the Soul King itself. However, Ikomikidomoe was defeated by Ichibē Hyōsube, who used Ichimonji to erase the Hollow's name. Since the Hollow contained too much consumed Souls to purify at once, Ōetsu Nimaiya sealed the Hollow inside a Zanpakutō, and Ichibē used Shirafude Ichimonji to rename the Hollow as Ikomikidomoe. It was hidden away in the Hōōden until the Wandenreich invasion of Soul Society, when Tokinada Tsunayashiro stole the sword during the chaos.

Powers & Abilities
Infinite Evolution: Similar, though not identical, to the ability of Aaroniero Arruruerie, Ikomikidomoe has the potential of limitless evolution through consuming the power of other beings. Even though Ikomikidomoe remained an Adjuchas, its power continued to grow to such an extent that even Baraggan, one of the first Vasto Lorde, acknowledged Ikomikidomoe's strength.

Immense Spiritual Power:

Descorrer: Ikomikidomoe can freely open Garganta for its wielder to travel through. It can do this either on command, or when it feels its wielder's life is in danger.

Zanpakutō Abilities
Due to its unique nature, Ikomikidomoe has numerous release commands that each draw out some of its power. Since Ikomikidomoe is a Zanpakutō forged from a powerful Hollow, most of Ikomikidomoe's powers are those of Hollows.


 * Orbit the stars, Ikomikidomoe!: The first release command; Ikomikidomoe transforms its blade into a massive Hollow arm that can attack on its own initiative.


 * Send them to their burials, and engrave them in memory, Ikomikidomoe!: The second release command; Ikomikidomoe transforms into a gargantuan Hollow noted to be around the size of the Espada Yammy Llargo's Resurrección or the Gillian spouting Hooleer.


 * Enhanced Roar: In this form, the mere roars of Ikomikidomoe can shake and devastate a part of the Rukongai.


 * Hollow Spawning: In this form, Ikomikidomoe can spawn numerous and varying Hollows to overwhelm opponents. These Hollows are said to resemble Adjuchas in both appearance and power.


 * Hatch the deceased, Ikomikidomoe!: The third release command; Ikomikidomoe transforms into a large, humanoid Hollow, though still smaller than its previous release. While this form resembles an Adjuchas, its power is greater than most Vasto Lorde.


 * Reiatsu Blast: In this form, Ikomikidomoe can release a massive blast of Reiatsu, strong enough to greatly injure three Espada.

Weaknesses
Conditional Wielding: Due to being a special, inherited Zanpakutō, Ikomikidomoe can only be wielded by select individuals. Specifically, only powerful hybrids such as Ichigo Kurosaki or Hikone Ubuginu can use Ikomikidomoe's power. If any regular Shinigami were to attempt to use Ikomikidomoe, they would be killed by the ensuing "Soul Suicide".

Appearances in Other Media
Ikomikidomoe appears in Bleach: Brave Souls during Hikone’s ultimate attack; Hikone uses Ikomikidomoe’s second release and summons its giant Hollow form, releasing a large burst of energy causing several tornadoes.

Trivia

 * The name "Ikomikidomoe" is not actually an existing word, but rather a combination of Kanji. refers to things that are "similar" or "the same", while  refers to the shape of a comma symbol.