Ninjas (ニンジャ, Ninja) are enemies in Killer Is Dead. They are a special variety of the creatures known as Wires, and originate
from the Moon. Ninjas attack using claws grafted onto their hands, as well as lengthy, spiked machete-like blades. As with other types of Wires, Mondo Zappa can use their blood to fuel his cybernetic left arm.