Shinsei

Meaning "Little Teacher" Shinsei was just a travelling monk who taught the Kami the way of Bushido and the Tao. He gathered the first Thunders from each clan for the first Day of Thunder to stop Fu Leng from destroying the empire.

He tasked his ancestors to guide the empire from a distance and only to make themselves known once every thousand years to gather the next thunders.

See Also The Hooded Ronin, Rosoku