Samehada

Kisame's main weapon is Samehada (鮫肌, "Shark skin"), a large unique sword of comparable size to Zabuza Momochi's zanbatō. Unlike a regular sword, Samehada is covered in large scales that shave instead of cut, much like a shark's skin (hence the name). It also has the ability to absorb any chakra around it, allowing Kisame to literally cut through his opponent's chakra. The amount that it can absorb is unclear, but it can even consume the demon fox's chakra with no ill effects. Samehada is also a sentient weapon and only allows Kisame to wield it. When Might Guy attempted to hold Samehada and use it against Kisame, it responded with a flurry of spikes from its handle and found its way back to Kisame. This weapon is also highly sought after by Team Snake/Hebi member Suigetsu, and is stated to be the sole reason Suigetsu joined Sasuke in his hunt for Itachi.