Yamato is an ANBU ninja from the Hidden Leaf Village and a leader for Team 7 in place of Kakashi Hatake. He was experimented on by Orochimaru and implanted with the cells of the First Hokage, Hashirama Senju.
Yamato was one of Orochimaru's test subjects, having implanted the D.N.A. of The First Hokage into him as a small child to try and replicate the 1st Hokage's unique bloodline limit that allowed him to use wood Jutsu's. However, Yamato was only one of 60 test subjects and believing all of them had died due to the experiments, Orochimaru fled the Hidden Leaf village without checking. Yamato would survive and thanks to the D.N.A. of the 1st Hokage, he would greatly excel as a ninja and even become the Anbu captain after Kakashi stepped down. He is currently the leader of Team 7 under the orders of the 5th Hokage. Due to the inclusion of Sai as Sasuke's replacement, there is some animosity that Yamato has to keep under check, going as far as saying that he will rule with terror... which is ultimately a scary face that only frightens Naruto.
Yamato accompanies Naruto, Sakura, and Sai to the Heaven and Earth bridge to meet Sasori's spy and uses Transformation to make himself look and sound like Sasori in his Hiruko puppet. The spy turns out to be Kabuto and everything goes relatively smoothly until Orochimaru appears, revealing that Kabuto and Orochimaru had planned on killing Sasori. When Naruto started sprouting his tails and made the bridge collapse, Yamato used his mokuton abilities to catch Sakura when she fell. After dealing with Kabuto, Yamato used his other ability to subdue an out of control 4-tailed Naruto, which is why Tsunade made him the new team captain.
Yamato would go onto aiding Naruto in his wind affinity training, keeping the Kyuubi under control since the seal on Naruto is weakening, allowing the Kyuubi more influence over Naruto as his anger spikes. He'd then accompany Naruto to aid Kakashi against Kakuzu after his technique was finished. They made their entrance blocking Kakuzu's wind fire attack with their own combined wind and water techniques to create a typhoon.
Yamato is currently hunting Sasuke with Naruto, Sakura, Sai, Kiba, Hinata, Shino, and Kakashi.
In the Narutoverse people's chakra possess a single elemental affinity which allows the individual to learn that specific element easier than any other.. However, the unique bloodline limit of the 1st Hokage grants Yamato with two elemental affinities, water and earth. By utilizing both of these elemental affinities at the same time, Yamato can create trees and various wooden structures. Though his mokuton abilities are not just limited to the surface that he stands on, he can also make trees grow from his own body. Another nifty ability he has is "Wood Clone." Much like a Shadow Clone but is capable of taking damage.
Yamato also possesses another ability thanks to the 1st Hokage's unique D.N.A., the ability to suppress Bijuu chakra.
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