Sasuke Uchiha is one of Naruto's finest fighters and among the most important characters in the story. Being an Uchiha, Sasuke was destined for greatness from the beginning, and the fact that he was a main character only made him that much more relevant. Kishimoto, Naruto's author, often describes Sasuke as the Yin to Naruto's Yang, meaning their importance to the story was almost equal and when one got stronger so did the other.

Sasuke's growth as a shinobi was particularly boosted when he left Konohagakure to seek power from Orochimaru. During those two and half years, Sasuke grew dramatically in strength and acquired skills that far surpassed that of Naruto Uzumaki. At the same time, something interesting that he also acquired during this time was the sword of kusanagi – a sword that would go on to become his trademark weapon for the rest of the series.

The chokutō Sasuke Uchiha referred to as a Sword of Kusanagi was his personal weapon throughout the entirety of Part II. It had a black scabbard and matching hilt, and was a larger size than a normal chokutō. It had none of the natural specialities as the one Orochimaru wields, such as the extension of the blade and the ability to cut through almost anything, both of which are natural attributes of the Kusanagi, but it was repeatedly shown to be very durable and able to cut through various materials.

Sasuke could expand on his sword's might by channelling his lightning chakra into the blade with chakra flow, which would increase its sharpness greatly through high-frequency vibrations, as well as increasing its cutting range. This would allow Sasuke to cut through almost anything, as well as numb the target who has been pierced by this lightning blade. During the Fourth Shinobi World War, a reincarnated Itachi Uchiha, while cooperating with his brother, temporarily wielded the blade to engage Kabuto Yakushi. Sasuke was later mortally wounded after being stabbed in the heart with this blade by Madara Uchiha.

The sword was later discarded during his battle with Madara, while the scabbard was destroyed during his battle with Kaguya Ōtsutsuki in her dimension. Sometime after the war, Sasuke replaced the sword with a new one.

Chidori and Sasuke’s Sword

Sasuke’s sword can be used with one of his first learned ninjutsu techniques, the chidori ninjutsu. This comes in many forms and can be manipulated at Sasuke’s will. Using ninjutsu with a sword, is a form of kenjutsu, which is using any techniques with a sword in the Naruto universe. One of Sasuke’s most impressive abilities is to infuse his chokuto sword with chidori, making it a lightning sword. If Sasuke slashes or stabs an opponent while the sword of kusanagi is infused with chidori, it paralyzes them by streaming the electricity into the enemy’s body.

Sasuke’s Susanoo Sword

Sasuke’s susanoo can utilize any weapon he would like. Before he had the complete Susanoo, Sasuke would use the Susanoo as a defense. When he was on the offense, he would manifest a bow and arrow out of the Susanoo to shoot at extreme speed at its target. Once he got the complete Susanoo, his weapon of choice changed to the chakra blade that he normally used, similar to the Kusanagi. The Susanoo, when the sword is manifested, is used when Sasuke is in great need of it, in most last resort cases. The type of dire circumstances he needs it include fighting the tailed beasts, summons like fully grown Gamakichi, and giant golems made with ninjutsus.