Sensor Type

A Sensor is a type of ninja who is capable of detecting the presence of other people through their chakra. A skilled sensor can detect their targets from a great distance, as well as differentiate the characters by their signature chakra alone. Such examples include Karin being able to tell exactly who is among a crowd of people, and Fū can tell that a sensor type is amongst the intruders. Some of these sensors can be good enough to tell if their targets are lying based on any fluctuating chakra.

Karin's sensing abilities is derived from her Mind's Eye of the Kagura; it is unknown if other sensors also have a specific jutsu to do so, or if it is a general skill.

Sages, who utilize natural energy, can also detect presence of people through their chakra, making them somewhat like sensors. The Inuzuka clan, all of whom has powerful senses like dogs, can also detect people, though they use scents rather than chakra. Also, Kisame Hoshigaki's great blade, the Samehada, is attracted to intense chakra, allowing him to hunt down such individuals.