Susanoo

Susanoo is the third ability granted by the Mangekyō Sharingan, after the ability in both eyes have been awakened.[1] It creates a gigantic, spiritual humanoid being that surrounds and protects the user. According toMadara Uchiha, for a Sharingan user to activate the Susanoo is a rarity.[2] Like the other techniques granted by the Mangekyō Sharingan, the user's eyes and body are strained while using Susanoo because it consumes a large amount of their chakra. Sasuke described it as feeling pain in every cell in his body which only grew from prolonged use.[3] Susanoo is formed through the materialisation of the user's chakra and as such differs in appearance as well as colour between users.

Development
Susanoo goes through several development stages as users gain control of it. The various stages are best seen while Sasuke is learning how to use Susanoo, though Itachi can briefly be seen with both incomplete and complete forms when he first begins reforming Susanoo afterKirin hit it and when he runs out of chakra and nears death. In its earliest form, users can only manifest some of Susanoo's skeleton. Sasuke does this to produce a ribcage that he uses as a defence, though the bones can bebroken, melted, or shattered. He also makes an arm to interact with his surroundings on one occasion. Because these skeletal structures do not entirely surround them, users can move around much easier.

As users gain additional control, musculature and skin begins to appear on the bones. It grows to its full size and the user is completely surrounded, eliminating the vulnerabilities of the skeletal form. However, Susanoo can also appear behind the user instead of just surrounding them. The user can also change the size of it to fit the current situation. Susanoo eventually develops into a "complete" warrior-like form, with skin, armour and its final arsenal of weapons finally manifesting. It can anchor the user to the ground at this stage, preventing opponents from forcibly moving them unless they can get through Susanoo's various layers. In its final form, this fully humanoid form is surrounded by a secondary layer of armour that causes Susanoo to resemble a yamabushi.

Itachi's Version
Itachi's version is crimson coloured (its complete form, however is dark orange coloured). In its left hand it wields the Yata Mirror as a shield. The mirror is endowed with all nature transformations, allowing it to change its own characteristics depending on the the attack it receives, thus nullifying the attack. In its right hand it wields theSword of Totsuka. The sword is a kind of Sword of Kusanagi also known as the Sakegari Longsword (酒刈太刀,Sakegari no Tachi; Literally meaning "Sake Cutter Longsword"), is sheathed in a sake jar held by a third hand growing from Susanoo's right forearm. It is an ethereal weapon with an enchanted blade capable of sealinganything it pierces. Victims of the sword are trapped in a genjutsu-like "world of drunken dreams" for all eternity. For longer-ranged attacks, it is able to use the powerful Yasaka Magatama, which consists of three chakra tomoe bound together by a single circular chakra thread. Zetsu said that the Totsuka Sword combined with the Yata Mirror essentially makes Susanoo invincible, and it has thus been labelled the Tempestuous God of Valour (勇武の荒神, Yūbu no Aragami).[1]

Bakura's Version
Bakura's version is blue coloured. He first discovered while he was in the Ferocious Five facing Bruton.