Burai

Introduction
Burai (武雷) was the sixteenth Master Ninja to the Mugen Tenshin Ninja Clan, and the father of Shiden and Raidou, making him the grandfather of Ayane, Kasumi and Hayate. He is mentioned in the Japanese and American version of the DOA Ultimate 1 game manual's relationship chart, but for reasons unknown is left out of the European version.

History
Many years ago, Burai was the head of the Tenjin school of the Mugen Tenshin-Ryu of shinobi. Soon the Ninja Master would marry and had two children, both with the potential to be his heir to the family legacy; Raidou, the eldest, and Shiden the youngest. As the boys grew under his tutelage, they were trained in the most advanced skills of the Tenjin Mon of Mugen Tenshin's Ninjutsu. Both of the young shinobi showed him much promise, but then everything changed. As Raidou grew older, his anger and rage became more unstable, as Shiden was constantly getting stronger than him, physically, mentally, and spiritually. Burai saw the darkness in his heart, and as Raidou fell into the depths of evil, he refused to let him lead the clan, out of fear of what Raidou's wickedness may bring. So it was that he instead passed the title of Touryou (頭首;clan leader) to Shiden. This caused Raidou to go insane with rage and so Raidou left the village, determined to become the most powerful Tenjin Ninja in history, leading to the catastrophic events that would plague the Mugen Tenshin clan.

Shiden
Shiden is Burai's youngest son, and was chosen as the 17th clan leader of the Mugen Tenshin Ninja Clan. Burai trained him in the most advanced of the Tenjin school's highest Ninja Arts, including passing to him the clan's best kept move; Rekku Jinpu Satsu; the Torn Sky Blast. Shiden became the 17th Master Ninja of the clan, earning the nickname Raijin, the God of Thunder.

Raidou
The relationship between Raidou and Burai was the same as the relationship with the biblical Cain and Adam, as Raidou tried desperately to please his father and become the next master. But Burai sensed a great evil brewing in his soul, and feared the worst for the clan's future. His decision to choose Shiden drove Raidou over the edge, and the Ninja left on a journey to become the most powerful Ninja in the clan.