Kōsan

Kōsan Grew up in Hakama Bay, but he was just a simple Ashigaru, then at the battle of Hakama Bay, He was made retainer to the son of the Shogun, When he became Shogun, Kōsan became the heir, now, a hardened war veteran, A Ruthless Warrior, and a Tyrant, you are a Samurai who made a rebellion against the emperor but failed (btw you are in your "Royal armor" that was made while you were winning)