What it does
Susanoo is the strongest ability available to those who have awakened the Mangekyō Sharingan in both eyes, having been passed down through the Uchiha Clan's generations. It manifests as a gigantic, humanoid avatar made of the user's chakra, which surrounds them and fights on their behalf.
Description
thumb|right|Sasuke's armoured Susanoo in the anime.
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In the anime, Sasuke's armoured Susanoo is depicted as being 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.
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Although the third databook states that the user must first unlock Tsukuyomi and Amaterasu before they can gain Susanoo,
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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).
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Shisui's Susanoo resembles the eponymous mecha from the anime Steel Jeeg.
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Despite Madara, Indra, Sasuke and Kakashi all being shown to manifest a stabilised Susanoo in the manga, only Madara is listed as a user of the Complete Body — Susanoo in the fourth databook.
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In Naruto Mobile, the typical humanoid Susanoo is referred to as the Susanoo's "second form", whilst the armoured Susanoo is referred to as its "third form".