Samemaru

Samemaru (鮫丸; Literally meaning "Shark Perfection") is the elder sister of the greatsword: Samehada. Samemaru likes it's brother, is also a sword and up until now it had never been wielded by anyone in the world. It rivals Samehada in size, if not bigger, however it is much more powerful.

History
As explained by Samemaru both itself and Samehada, where born from an awkward shark. After a while, the two were split up and set on their own ways. Samehada went on to be used by Kirigakure, while Samemaru, would roam the world in its human form protecting itself from any troubles it would encounter along the way. It's motives would be to take down and that stood in her way, however her motives would come to a change when she'd heard of a tale about Samehada. With instant notice of the name, Samemaru would gather information about the swords whereabouts, where she learned it was being used in the Hidden Mist Village. At this time, Samehada would be wielded by Shizuka Hōzuki. After years of traveling Samemaru reached the village, and would begin its search, however, she would first encounter Amaka Date, and by the looks of the tool that was on Amaka's back, she was able to conclude that it was one of the seven swords, that she'd heard about before. Samemaru could feel that Amaka had a bit of suspicion, and tempted her. Samemaru would stand at Amaka's front, forcefully launching an attack. Amaka somewhat aware, would be able to protect herself, then later subdue Samemaru leading to its defeat. Clinging firmly to Amaka in its sword form, it jumped right into her hands. Amaka would take the sword as her own, being its first ever wielder.

Abilities
As the elder sister of Samehada, Samemaru posses nearly all of its base capabilities. In its sword form, Samemaru's skin is extremely rough. Being able to cut nearly anything that touches it. Samemaru can literally cut through the toughest of metals, this also includes humans. Both Samehada and the Clever sword are nothing in cutting power when compared to Samemaru. Meaning, it could cut through Samehada itself.

Samemaru can also, to nearly any affect. While it may be weird, it's favorite flavor is anything -based. This reasoning is unknown, however Amaka uses it to her advantage. It seems that Samemaru posses the same ability as it's wielders as well, because at one time, when Samemaru absorbed the chakra of the Chōmei — during one of its rampages — it formed as an aggregate within Samemaru. It's most notorious ability is being able to transform into a human itself. In this form, Samemaru can talk, and even transform one of its arms into its sword form.