Reborn in a Land of Iron in Naruto World before the second shinobi war, he trained to become the strongest swordsman in all nation, with his swordsmanship he slayed his enemies. Creating a sword techniques only unique to him making him dominate every battle he face.
After disobeying Mifune's order and going through the war to show that samurais are equal or even greater than the shinobis after being insulted by a rouge ninjas who tried to attack their country.
Swordsman MC
Not Shinobi MC
MC x Mei
He earned his moniker of Hitokiri Battousai in the third shinobi war after slaughtering a hundreds of shinobis with only his sword techniques.