I'm pretty sure that Tobirama kidnapped and experimented on countless Uchiha. He most likely had some human centipede-type shit going on that would put even Orochimaru to shame.
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Who knows what he did. What we do know is that most of his work involved surgical procedures (to study the inner-workings of the Uchiha), deceased corpses (to invent Edo Tensei), hypotheses trials (to deduce his conclusion concerning the functionality of the Sharingan), manipulation of space and time (to invent Hiraishin), and a lot of other stuff I'm sure, that he most likely never got to finish or bring into fruition due to his early death. Orochimaru stole the formula for Edo Tensei from Tobirama (or recreated it, whatever), so I wouldn't be surprised if he also stole the organ-implanting methods (Danzo's arm, Shin's head) from Tobirama. Tobirama invented a lot of crazy things that would require some very weird procedures to create---and Orochimaru was no better. They probably had a bunch of cronenbergs limping around in whatever godforsaken laboratories they owned.I don't think he needed to do that to reach those conclusions.
Yea maybe.Who knows what he did. What we do know is that most of his work involved surgical procedures (to study the inner-workings of the Uchiha), deceased corpses (to invent Edo Tensei), hypotheses trials (to deduce his conclusion concerning the functionality of the Sharingan), manipulation of space and time (to invent Hiraishin), and a lot of other stuff I'm sure, that he most likely never got to finish or bring into fruition due to his early death. Orochimaru stole the formula for Edo Tensei from Tobirama (or recreated it, whatever), so I wouldn't be surprised if he also stole the organ-implanting methods (Danzo's arm, Shin's head) from Tobirama. Tobirama invented a lot of crazy things that would require some very weird procedures to create---and Orochimaru was no better. They probably had a bunch of cronenbergs limping around in whatever godforsaken laboratories they owned.
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Exactly. As long as he’s fought them and killed their members in front of them he wouldn’t have to.I don't think he needed to do that to reach those conclusions.
To study the Sharingan, Tobirama used Madara's body.
To create Edo Tensei, Tobirama used prisoners' body.
Tobirama has created also a Kinjutsu similar to Chiyo's jutsu which permit to give his vital energy to another person.
Tobirama has written certainly some scientific books about different things that Orochimaru used after.
Tobirama was like Orochimaru but the difference between them is that Tobirama didn't use child or innocent people as experimental body.
And Tobirama created these jutsu to counter his enemies and not for his personal profit.