The Lin Kuei is a clan of Ice Ninjas based in the mountains of Northeastern China they have been around for as long as anyone can remember since Ancient China. They were the first ninja clan in existence, and their arts are deadly, secret, and powerful they are assassins, thieves and mercenaries for hire. They dress in entirely in blue and grey ninja garb except for elites and leaders who wear purple they are sinister, evil, coldhearted, and masters of ice they have mastered ice to the highest level that they do not need chakra or chi to harness it before all members were entirely Chinese who were born into the clan and have been members for generations only recently did they accept foreigners to join their ranks (foreigners may not advance and typically stay as warriors or infantry) there are four ranks in the Lin Kuei (Trainee, Infantry, Warrior, and Grandmaster) the strongest member becomes handpicked by the grandmaster to become the new one to advance in rank you need to work your way up they have strict rules and beliefs you are not supposed to make your presence known, no one except the family and clan must know you're a Lin Kuei, you must accomplish your missions stealthy and successfully and finally you must not reveal clan secrets to outsiders or go against the way of the clan including your superiors or the grandmaster doing this results in expulsion from the clan or death over time the Lin Kuei became feared in China for their numerous legends . For years no one knew their secrets or possessed brief knowledge of them. Until a Japanese Lin Kuei member named Takeda became tired of the clan's strict ways and left on a ship back to Japan. However leaving the clan without the grandmasters approval is considered treason and Lin Kuei assassins were sent after him. He managed to kill these assassins and return successfully to Japan for years he worked for the various feudal lords and shoguns with the skills the Lin Kuei taught him. Eventually he spread these skills and taught them to people who became his followers (this only enraged the Lin Kuei back in Mainland China). Overtime he founded the first ninja clan in Japan the Shirai Ryu they became bitter rivals of the Lin Kuei and dressed in similar garbs of yellow and black with dark black for elites. At first they used weapons, magic, and modified versions of Lin Kuei tactics which became NINJITSU. They further separated themselves from the Lin Kuei by mastering the art of fire without using chakra or chi two more ninjas clans formed in Japan the Koga Ryu and the Iga Ryu who operated with the Shirai Ryu on a loose spy network and served the various feudal samuari lords . These clans did the same things as the Lin Kuei murder, thievery, and mercenary work (all clans became fierce rivals of the Lin Kuei however the Lin Kuei preferred to stay in China while the other clans where in Japan). Overtime the Shirai Ryu became more prominent and famous then the Lin Kuei who faded into legends and fables. The first grandmaster Takeda managed to evade Lin Kuei assassinations attempts well into his older years when he died by poison slipped into his tea. Their most famous member Scorpion who was later found dead from an apparent murder while in China on a mission not long before the Shirai Ryu clan and village was wiped out (he would later be reincarnated as a hell bent specter called Scorpion). The Shirai Ryu continued on for 300 more years when they were mysteriously wiped out and their village was burned to ashes. Some suspect this is the work of their fierce Chinese enemies the Lin Kuei. Not long after this two ninja clan leaders called Madara Uchihia (of the Shanringan and fire wielding Uchihia Clan) and Hashirama Senju of the forest Senju clan established the Leaf Village of Konoha on the site of the original Shirai Ryu village. Thus began the time of the Leaf Ninjas of Konoha. The Koga Ryu founded Kumogakure (the village in the clouds) in the land of lightning, and the Iga Ryu founded Sungakare (the sand village) after the respective elements they mastered lightning and sand. Other ninjas rose up and with their clans formed other ninja villages that we come to know as The Naruto Realm or Naruto-Verse.
It's been long past since both the great five nations and Earth Realm have both had its fights for survival. While the village are back to its former glory, a mysterious ninja with the eyes of the Sharingan has bound together with Out World's Leader, Shao Kahn. As the mysterious figure who hid them self behind a puppet still felt that they weren't strong enough to bring forth both realm. The mysterious figure found a world above the heavens called the Soul Society and brought forth a man that was trying to bring the place down, his name was Aizen. As if that wasn't enough, the mysterious figure hit one last spot and it was across China where the mysterious figure laid out the plans and recruited General Bison. Now as all the pawns was in order, it was time to invade each realm and bring all of it to the Realm of Naruto. To bring back a deadly fighting Tournament known as Mortal Kombat where everything goes. But first the plan was to get all the realms to fight each other but if all goes to plan, Naruto Realm and Mortal Kombat Realm join forces to fight the Bleach Realm and Street Fighter Realm and weaken the realms so they can gain control.