Susanoo

Ryun Uchiha's  is the version of the dōjutsu technique, Susanoo, employed by Ryun Uchiha. Unlike and, Ryun awakened Susanoo first in his eyes and then the   Mangekyō dōjutsu later on. Susanoo is formed through the materialization of the user's chakra and as such it may differ in appearance and colour between users. Ryun's is a light-reddish-pink color with bright green eyes.

Mangekyō Sharingan version
Susanoo goes through several development stages as users gain control of it. The various stages are seen while Ryun is learning how to use Susanoo, though Sasuke and Itachi have also shown both incomplete and complete forms. In its earliest form, users can only manifest some of Susanoo's skeleton. Ryun does this to produce a ribcage that he uses as a defence, though the bones can be broken, 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. The user can also change the size of it to fit the current situation. Susanoo eventually develops into a "complete" form, with skin, armour and its final arsenal of weapons finally manifesting. It anchors 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.

Other than its ability to partially manifest to fit the situation, Ryun's Susanoo can be kept activated longer, because it drains his chakra less substantially due to his mastery of it. Ryun's incomplete version forms the spirit with skeletal muscles for attacking. He is also able to combine the technique with Amaterasu to further increase his defensive power by making it impossible to touch Susanoo without being ignited. Ryun's incomplete version has a more Pharaoh-like appearance, it has a very round head, with a box-like design around it's eyes and nose area, it also has a short spike-like protrusion coming from the bottom of it's chin, similar to a Pharaoh's mask. It wields a chakra spear in its right hand capable of easily shattering stone pillars. His incomplete version once looked similar in form to a fox, complete with ten tail-like protrusions. After being enraged by Ibitsu's story of Danzō, who had killed his brother as an apparent peace offering to another nation, Ryun's Susanoo changed into the more common, humanoid form, and later, after the formation of Tsukiakari, he is able to produce a fully manifested Susanoo, complete with flesh and armor. Susanoo may feed on it's user's emotions to become stronger. Ryun and Sasuke's versions of Susanoo was overall shown to change it's weapons accordingly. Later on, in his battle with Kurisu Taizen, after both an onlooking Seireitou, and Kurisu had taunted him with his brother's death, his Susanoo made a change. The sword like arrow transformed into a spirit weapon, the Tonbogiri (蜻蛉切, Dragonfly cutting spear), which is an elongated spear, made of chakra, that instantly cuts in two anything that the blade touches. During the same fight, he also awakens his defensive spirit weapon, the Wanyūdō (輪入道, Wheel Monk). It is a circular shield, similar in some aspects to the Yata's Mirror, however a skull forms in it's center. The shield itself is strong enough to endure large scale physical damage, but the skull has the ability to suck in and absorb ninjutsu that comes near the shield, making it a truly powerful defense.

In it's most recent appearance, it has been shown capable of gaining it's final layer of armor, making it appear like a yamabushi, and gaining the Yasakani no Magatama (八尺瓊曲玉, Benevolence Beads of Imperial Ascension) is a golden necklace worn around the Susano'o neck, and completes Susano'o power. This necklace is also seen in Seireitou's version. The powers of the necklace are yet unknown.

Eternal Mangekyō Sharingan version
After awakening the Eternal Mangekyō Sharingan, a user's Susanoo changes its form. The user is still capable of summoning it in phases, but each phase is greatly enhanced. Its defensive power is incredibly increased, even in its ribcage state, where, in 's version, it took Naruto Uzumaki's without any damage. Furthermore, the Susanoo incorporates the design of the Susanoo used by the Sharingan user's eyes used to obtain the Eternal Mangekyō Sharingan, as well as the user's own. For example, Madara's version contained both his own Susanoo on one side, and 's on the other side. The "complete" Susanoo form shifts its appearance as well, and its spirit weapon is coated in the flames of Amaterasu.

Trivia

 * The Tonbogiri (蜻蛉切) is one of three legendary Japanese spears created by the famed swordsmith Masazane, said to be wielded by the daimyō Honda Tadakatsu. The spear derives its name from the myth that a dragonfly landed on its blade and was instantly cut in two. Thus Tonbo (Japanese for "dragonfly") and giri (Japanese for "cutting"), translating this spear's name as "Dragonfly Cutter/Cutting spear".
 * Wanyūdō (Japanese: 輪入道 literally "wheel (輪) monk (入道)") is a figure in Japanese mythology, a relatively well-known yōkai in the folklore of Japan. Wanyūdō is said to take the form of a burning oxcart wheel bearing the tormented face of a man. Various folklore purports him as the condemned soul of a tyrant daimyo who, in life, was known for having his victims drawn on the back of an oxcart. He is said to guard the gates of Hell and to wander back and forth along the road between this world and the underworld, scaring townsfolk as he passes and stealing the souls of anyone who gets too close in order to bring them to Hell with him.