Susanoo

Susanoo is a gigantic, humanoid avatar made of the user's chakra which surrounds them and fights on their behalf, that has been handed down throughout all the generations of the Uchiha Clan. It is the strongest ability available to those who have awakened the Mangekyō Sharingan in both eyes.

Attributes
When activated, Susanoo forms around the user and becomes an extension of their will, acting and attacking on their behalf. By default, Susanoo is anchored to its user and they to it: in its less developed forms it will move around with the user; in its more completed forms the user will be suspended within Susanoo, being brought with it as it moves around. This connection allows Susanoo to shield against physical attacks, one that becomes more difficult to penetrate as it is manifested more fully.

Although Susanoo is quite effective as a defense, it is able to distinguish in what it blocks. For example, the user can still perform jutsu while within Susanoo and the attacks will pass through it without complications. Others can be brought within Susanoo with the user's permission, and users can likewise choose to leave Susanoo's protective structure. The latter characteristic can be used against the user; if an opponent can bypass Susanoo, however slightly and latch onto them, they can be pulled out of Susanoo. With continued mastery, Susanoo can have increased defensive capabilities even at its rib-cage stage, as seen when A was able to crack a rib of Sasuke's Susanoo, but conversely, could not crack Madara's. If it is damaged, Susanoo does not regenerate and it can only be repaired either by advancing it to the next developmental stage or by dispersing it and then forming it anew. Also, Susanoo is also only able to defend against physical attacks, so they are still vulnerable to visual or auditory attacks for example. Additionally, unless the legs of the Susanoo are fully manifested, the user's still vulnerable to attacks from below.

Susanoo draws on the user's chakra in large amounts so long as it is active. Sasuke Uchiha describes the sensation of using Susanoo as feeling pain in every cell in his body, which only increases over time of usage as well as at higher developmental stages. Being a Mangekyō Sharingan-based ability, it also places a strain on the user's eyes the more it is used, however, it is not actually necessary for one's Mangekyō Sharingan to be active while using Susanoo; in fact, Madara Uchiha is able to use it without any eyes at all.

Development
As seen with Sasuke's learning how to use it, Susanoo has several developmental stages. Practiced users go through all the stages every time they manifest it, layering more advanced stages over earlier ones or stripping them away as is needed; they can choose to stop at any developmental stage. At its simplest level, users only manifest aspects of Susanoo's skeletal structure, such as a rib-cage for basic defense or an arm for interacting with the surroundings. Once a full skeleton is made, musculature and, later, skin forms until finally a complete humanoid is shaped. In these early stages, typically only the upper half of Susanoo is materialized, with legs becoming common once it reaches its full humanoid form; however, not all Susanoo users can accomplish the latter feat.

In its next stage, armor forms around the humanoid for further protection, causing it to resemble a yamabushi. In its final stage, users stabilize the chakra that comprises Susanoo to create a colossal form known as the, the ultimate ability of the Mangekyō Sharingan. In this state, Susanoo gains a tengu-like nose, wings for flight, and is clad with robes and ornate armor. This form possesses power comparable to that of a tailed beast, capable of levelling giant mountains and, when enhanced by Six Paths Chakra, small planetoids with ease. Users can also channel their own techniques into the Complete Body — Susanoo, as well as shape it around the Nine-Tails to improve its offensive and defensive capabilities.

Users are able to mingle the chakra that makes Susanoo with chakra from other sources. Sasuke uses the chakra from Jūgo's Sage Transformation to make a, with markings reminiscent of the Cursed Seal of Heaven spreading across it. He later stores the chakra of the nine tailed beasts within his Susanoo, drastically improving its strength and causing lightning to emanate from its back.

Versions
Susanoo differs between users, in terms of color, design, and weaponry. Some features are consistent, however, all Susanoo constructs are deviations of the Japanese tengu, they also have two sets of arms — one of which can form wings as part of its Complete Body form — and six fingers on each of its hands. All Susanoo wield at least one sword.

Itachi Uchiha
Itachi Uchiha's Susanoo was yellow in the manga; in the anime, its skeletal and armored forms were red and its humanoid form was orange. In its humanoid form, its face was framed by locks of hair, with an appendage on its chin reminiscent of a Pharaoh's false beard. When its armor was formed, Itachi's Susanoo resembled a long-nosed tengu and it wore a pair of magatama earrings.

Itachi's Susanoo possessed a curved blade that resembled a dagger or tantō. He rarely used this, preferring his Sword of Totsuka, wielded in its primary right hand and sheathed in a sake jar held by its second right hand. The Sword of Totsuka is an ethereal weapon with an enchanted blade that, in addition to standard cutting, can seal anyone it pierces, trapping them in a genjutsu-like "world of drunken dreams" for all eternity. In its primary left hand, Itachi's Susanoo wielded the Yata Mirror, a shield that can change its nature depending on the attack it receives, thus nullifying it. According to Black Zetsu, the simultaneous use of the Sword of Totsuka and the Yata Mirror made Itachi essentially invincible. For long-range attacks, Itachi could use Susanoo to perform Yasaka Magatama. In Naruto Shippūden: Ultimate Ninja Storm 4, Itachi has an exclusive Complete Body — Susanoo form that retains the traits of his previous forms, including a retractable version of the Yata Mirror, and a broadsword version of the Sword of Totsuka.

Sasuke Uchiha
Sasuke Uchiha's Susanoo was initially depicted as a dark shade of blue in the manga, though it is purple in all other medias. Because Sasuke's development has often been marked by intense feelings of hatred, his Susanoo is noted to be much darker in composition compared to Itachi's. Whereas Itachi's Susanoo appears relatively "normal", Sasuke's possesses demonic horns, a long appendage on its chin, and a malevolent grin. Its armored form initially appears largely the same as Itachi's save for having jagged teeth around its hood. After Sasuke gains the Eternal Mangekyō Sharingan, however, its appearance changes, the armor's mouth taking on a beak-like shape and generally becoming ghastly-looking. In its Complete Body form, Sasuke's Susanoo has a helmet that features a long tengu nose, two spikes over each eye, a slit stretching across its mouth, three gaps on each of its cheeks and one additional gap on its chin.

Because of his Rinnegan, Sasuke can use the wings of his Complete Body Susanoo to block out the light of the Infinite Tsukuyomi. When drawing on the power of the tailed beasts, the armor of his so-called is reduced somewhat, exposing the humanoid within. through as well as Fire Release: Great Fireball Technique in the anime. This form is capable of generating a sword instead of having it form alongside the Complete Body Susanoo, enabling him to catch opponents off guard. It can be used as a projectile and can explode into massive pillars on lightning large enough to engulf Kurama.

Sasuke's Susanoo has a blade in all its forms: a saber in its developmental forms; an Ōdachi in its humanoid form, wielded with its second right hand; a pair of katana in its Complete Body form. Its primary weapon, though, is a bow, manifested on the wrist of its left arm; the bow can double as a shield, a function that becomes more visually apparent in its armored form. Arrows are drawn from an orb held by its primary right hand and can be fired very quickly, such that only Kabuto Yakushi, while utilizing Sage Mode, has been able to avoid one. Weapon properties can be augmented, either with black flames in its armored form or lightning in its Complete Body state. Sasuke is able to perform techniques through his Susanoo, such as Chidori and Great Fireball Technique.

Madara Uchiha
Madara Uchiha's Susanoo was dark blue in color. His Susanoo was made up of two entirely different sides that were conjoined along their spine, both of which had a distinct face: the front face had elongated canine teeth in its lower jaw bracket and two tusks growing from said jaw, while the back face had similarly elongated canine teeth in its upper jaw bracket and a single horn protruding from its forehead. In its armored form, the usual tengu-like armor splits from its forehead down, revealing Susanoo's eyes while obscuring the rest of its face. Curiously, his armored Susanoo appeared to always form the Tiger hand seal with its front hands, and was the largest of its variation. In its Complete Body form, its head gained a long tengu nose and two lines running down from its mouth to its chin area, as well as hair which was tied up at the sides.

Madara's Susanoo wielded distinct, undulating blades that resembled kris, held in the right hand of each side. He was able to throw the blades as guided projectiles. In the anime, Madara was able to manifest swords in all four of Susanoo's arms; the blades left traces of blue, fire-like chakra in the ground after impacting and could unleash shockwaves capable of obliterating numerous shinobi in a single strike. In its Complete Body form, the swords more closely resembled traditional katana, complete with sheaths held in the secondary arms. These swords could cut through mountains across great distances. For long-range attacks, Madara could use Susanoo to perform Yasaka Magatama.

Indra Ōtsutsuki
Indra Ōtsutsuki's Susanoo, named, was purple in color. In its Complete Body form, it had accentuated eye-holes, a long tengu nose, a spike over each eye, a slit across its mouth and three gaps on each of its cheeks. In the anime, the skeletal form of Indra's Susanoo was also shown.

Shisui Uchiha
In Ultimate Ninja Storm Revolution, Shisui Uchiha can use a green Susanoo. It has blade-like appendages on its shoulders, the side of its face, and along its forearms. Its right arm wields a drill-like lance that Shisui can coat with fire to create a vortex of flames. It is also able to unleash a barrage of chakra needles. In Naruto Shippūden: Ultimate Ninja Storm 4, Shisui has an exclusive Complete Body-Susanoo form, complete with a second pair of wing-shaped arms, tengu like features, and wielding a large drill-like sword.

Kakashi Hatake
Kakashi Hatake's Susanoo is light blue in color. The Susanoo he uses has only been seen in a Complete Body form. It had the characteristic tengu nose, a forehead protector-like plating on its head, two locks of hair falling on either side of its face, a hole in its chin, and a vertical mark extending across its left eye, similar to Kakashi's own signature scar. It wields a katana, but its most notable weaponry are the Mangekyō-shaped shuriken that can warp away targets on contact.

Hagoromo Ōtsutsuki
In the anime, Hagoromo Ōtsutsuki showed a light blue Susanoo capable of entering its Complete Body form and utilize chakra blades. Two locks of hair fell on each side of the face and a single horn protruded from the chin, resembling Hagoromo's facial hair. It possessed a sharp tengu-like nose and a jagged mouth, giving it a demonic appearance. His Susanoo was much larger than other users, reaching a size comparable to the Ten-Tails.

Influence

 * Similar to other Mangekyō Sharingan abilities, Susanoo was taken from Japanese mythology: Susanoo is the wild god of sea and storms, brother to Amaterasu and Tsukuyomi. He was born from Izanagi washing his nose. Susanoo inherited his father's sword Totsuka no Tsurugi, which Izanagi used to kill his newborn son, Kagu-Tsuchi after his birth burned his mother, Izanami, to death. After his exile for his relentless harassment of Amaterasu, Susanoo redeemed himself when he used Totsuka to slay the serpent Yamata no Orochi and obtained the Sword of Kusanagi from the monster's corpse. He later gave the acquired blade to Amaterasu as a peace offering.
 * Susanoo's designs are based on, well known yokai that are associated with the ascetic practice of shugendō. In their final forms, the Susanoo are garbed in the attire of shugendō practitioners, known as yamabushi, and wear hoods that resemble tengu masks, with Itachi's and Madara's appearing as long-nosed Hanataka Tengu and Sasuke's as a crow-billed Karasu Tengu. In Japanese myth, Susanoo produced the fiend Amanozako who is said to have been the progenitor of the Tengu.
 * Madara's Susanoo design may be influenced by, a human-like being described in the as having one body with two faces back-to-back, each with its own set of arms and legs.
 * The is one of the, together with the Sword of Kusanagi and the.
 * Itachi's Susanoo carries the Sword of Totsuka in a gourd. An ethereal weapon inside a gourd could be a reference to the hyōtan-kozō, a gourd spirit from Japanese folklore.
 * Susanoo's skeletal stages also resemble the, a yokai composed of the vengeful souls of fallen soldiers who were not properly buried, taking the form of a skeleton fifteen times the size of a regular person.

Trivia

 * In the anime, Sasuke's armored Susanoo is depicted identical to Itachi's, even wielding weapons identical to the Sword of Totsuka and Yata Mirror. Its appearance and weapons were changed to match the manga in subsequent appearances.
 * Although the third databook states that the user must first unlock Tsukuyomi and Amaterasu before they can gain Susanoo, it appears that this was only the case for Itachi. According to the fourth databook, acquiring this technique is done through the user simply manifesting the Mangekyō Sharingan in both eyes.
 * Prior to the completion of Sasuke's Susanoo, its humanoid form was glimpsed as a shadowy figure in a genjutsu he used.
 * Sasuke's humanoid Susanoo bears a great resemblance to Raideen the Brave, one of a number of Yoshiyuki Tomino references in the series (another being the Gundam-derived names of Kakuzu's techniques).
 * Shisui's Susanoo resembles the eponymous mecha from the anime Steel Jeeg.
 * Despite Madara, Indra, Sasuke and Kakashi all being shown to manifest a stabilized Susanoo in the manga, only Madara is listed as a user of the Complete Body — Susanoo in the fourth databook.
 * In Ultimate Ninja Storm 3, Madara's Susanoo swords are capable of spinning, giving them a drill-like ability.
 * In Ultimate Ninja Storm 4, Itachi and Shisui's Susanoo are given Complete Body — Susanoo forms, designed by Kishimoto himself, making it so all known Susanoo users have access to its highest form across different media. Also in the game, Madara's Limbo clones possess the ability to use Susanoo, while Madara himself, empowered as the Ten-Tails jinchūriki, was shown using a larger form of the Complete Body — Susanoo. For an Ultimate Jutsu, The Last Sasuke manifests a Susanoo arm in the place of his own missing arm.
 * Indra's Susanoo was given its unique name in Naruto: Shinobi Collection Shippū Ranbu.
 * There is a plothole regarding the introduction with Itachi's Susanoo. When Sasuke unleashed his Kirin jutsu on Itachi, Zetsu stated that the jutsu uses natural lightning which strikes at a speed of 1/1000th of a second, making it nearly impossible to dodge. Itachi's Susanoo supposedly protected him from the strike, but he never formed it before the strike, and at 1/1000th of a second, there's no way Itachi's Susanoo could have formed fast enough to actually protect him from it. This is obviously due to Susanoo's concept not being fully finished yet as this was it's debut, similar to how Pain's Rinnegan didn't look like it's finalized form the first time it was shown during the Akatsuki's astral projection meetings.