Arashikage is a fictional ninja clan from the military-themed G.I. Joe: A Real American Hero series of comics, television shows, and action figures. The name is derived from the Japanese words for storm (嵐 arashi) and shadow (影 kage). It is central to the back-story of several prominent characters, including Snake Eyes and Storm Shadow.
Centuries ago, the Emperor of Japan asked his general to protect the Jewel of Amaterasu, a gem said to allow the wielder to control their chi. The gem was so well concealed, that its location was lost with the ascendancy of emperors, and the general's family was eventually reduced to simple farmers, who would later become the Arashikage. For generations, the Arashikage worked as shadowy assassins, using deception to earn their keep as ninjas, as well as developing a reputation for being able to perform impossible tasks.
Later, the Arashikage would continue the deception, financing front businesses to hide their true work as covert operatives, bounty hunters, thieves, and contract killers. Their remote compound was hidden in the mountains of Japan. Only those who truly prove their worth, and commitment to the Arashikage katas and discipline, were allowed full membership into the clan. This was denoted by the tattooing of the clan symbol on the forearm, the 63rd hexagram of the I Ching.
The Arashikage Clan first appeared in issue #21 of G.I. Joe: A Real American Hero, where it was revealed that Snake Eyes and Storm Shadow have the same tattoo. Later stories described how Thomas Arashikage, after receiving his initial training in order to become a member of the clan, participates in the Vietnam War. During the war he meets an American nicknamed Snake Eyes, whom he brings back to Japan after the war for training in the ways of the ninja.Cobra Commander learns of this and, angry with Snake Eyes because of a car accident in which Snake Eyes family and Cobra Commander's brother were killed, sends Firefly to kill Snake Eyes.