A poisonous Salamander once lived in his village. When it died, Hanzo, as a child, transplanted its poisonous gland into himself, wanting to gain more power and teach his body to produce poison. After that, the villagers became afraid of Hanzo, as almost everyone who interacted with him died of poison or was poisoned. Therefore the future leader had to wear a respirator to protect people from his own poison.
At an unknown point in his past, Hanzo fought against the samurai. Hanzo was just enough to call his name for his opponents to flee the battlefield. Only Mifune remained to confront Hanzo. Hanzo quickly defeated the young samurai when he cut his forehead with a poisoned Kama. Hanzo praised him for his bravery and asked him to give his name so he could be told of him as a hero, but Mifune only asked him not to hurt his comrades. For this, Hanzo praised him again and left an antidote beside him, adding that it might be able to save his life.
During World War II, ninja Hanzo fought against Jiraiya, Tsunade, and Orochimaru and was victorious. But he was impressed by the strength of his rivals and left them alive on the condition that they bear the title of “Sanghin of Konoha. To consolidate his power in the village and get rid of the Akatsuki, he makes a pact with Danzo of Konoha. Along with his men, he traps the Akatsuki leaders, Yahiko, Nagato, and Konan. There he gives Nagato a choice: either he kills Yahiko or Hanzo kills Konan. Nagato hesitates to kill Yahiko, but he stabs himself with his kunai. Nagato, in a fit of rage, frees Konan by sacrificing his legs. He then summons Gedo Maso and uses the Phantom Dragon technique to consume the souls of all Hanzo’s soldiers, but the latter manages to slip away at the last moment using teleportation techniques.
Later, Nagato, in the form of Paine, kills Hanzo.
Fourth World Shinobi War
In the Fourth World War, Kabuto summons shinobi with the help of Edo Tensei to fight on the Akatsuki side. A revitalized Hanzo pursues a retreating sabotage squad. He stops them with a poison cloud. But in this one.
Samurai vs. Hanzo. Again a squad of samurai, led by Mifune, comes to their aid. As years ago, they face off in a brutal fight to the death. Hanzo does not immediately recall in Mifune his old rival, whom he gave his life to. Mifune cries out to Hanzo that he has lost his former nobility and majesty. Realizing that Mifune is right, Hanzo decides to surrender, but Kabuto intensifies his control over him. Nevertheless, Hanzo manages to rip open his own stomach, thus helping to seal himself up. When Itachi Uchiha forces Kabuto to dispel Edo Tensei, Hanzo’s soul is released along with everyone else.
Hanzo is judicious and calm, one might say, a true shinobi who would rather do what is reasonable than what is fair (though he can break that principle). He is also capable of underestimating his opponent, but if he sees that he has held out against him for too long he is aware that he is a strong shinobi, so he can leave him alive as a reward for his skill or simply for fighting well, even if he himself has the ability to tilt the fight in his favor (such ninja as the three legendary Sannin gained their title from him, the same happened with Mifune). In addition to strength and survivability, what Hanzo values most in a shinobi is faith. However, he can be described as both a patriot of Ame and a power-hungry one – like Danzo Shimura (with whom he once even formed an alliance) he is willing to defend his village by any means possible by the “ends justify the means” principle, but fearing that his power in the Village might be challenged by the Akatsuki and their leader Yahiko, he did not hesitate to use methods of eliminating him.
Hanzo has brown eyes, long blond hair, a slender build, and tanned skin. He is usually dressed in a standard Amegakure uniform. Due to the fact that he possesses the poisonous salamander gland and even his breath emits poison, he always wears a sort of respirator with the symbol of his home village engraved on it. He also has a dark purple cloth draped over his shoulders and a protector of the same color on his head. Being resurrected by Edo Tensei, Hanzo’s eyes have acquired a black sheath.
Hanzo, as noted by Jiraiya, is a fairly strong shinobi, as he was able to fight on equal footing with the Sannin and Mifune. Summoning the Salamander makes him even more dangerous, and he wields his scythe as deftly as Mifune does with his sword. Also, since the scythe is on a chain, this gives Hanzo a mid-range advantage, as well as his techniques designed for mid-range attacks, which is quite valuable when coming up with a strategy. He can also summon Ibuse.