Acrobat

Killer B goes into a pose with his seven swords. He holds a blade at both his elbow joints, one at his left armpit, one in his mouth, one in his right neck joint, one between his stomach and one at his right leg. As strange as it seems, Killer B is very skilled with these blades, and spins in a manner similar to a buzz saw, leaving no opening for even a skilled Sharingan user like Sasuke Uchiha and a highly trained swordsman like Suigetsu Hōzuki.

The swords can be charged with lightning chakra to greatly increase their cutting power through high-frequency vibrations.

Trivia

 * Despite carrying more swords than should be reasonable to begin with, Killer B does not carry a single one of these blades in his hand but instead, keeps them all held in his joints.