Your the twin brother of Tobirama Senju and the younger brother of Hashirama senju. You lived all the way up until Hashirama became hokage. You were killed in battle which is what strove Tobirama to create the reanimation justu and revive you. There...
Looks: like yourself but with white hair long hair similar to Madaras
Clothes:
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Justu: you know a lot of Tobiramas justus and can even do wood style due to Tobirama putting a bit of Hashiramas cells within you. Why? Who knows.
One more thing. For the sake of the story. Let's just say that the perfected reanimation justu that Orochimaru used to revive the previous hokage is the same perfected reanimation justu but the only reason why Orochimaru thought it was perfected is because Tobirama never said or wrote how to do the perfected version. Along with you having Hashirama cells.
