In his younger years, he would regularly go to Yoshiwara and visits his lover Tayuu Suruzan.
Yoshiwara back then was known as a place for a meeting place and source entertainment for high ranking officials.
Sada Sada used Tayuu Suruzan beauty as a tool to take the seat of the Shogun. He would hire the Assassin organisation Naraku to murder the high ranking officicals. By using her as bait, there wouldn't be opposition force against Sada Sada.
When the Amanto invaded, the 12th generation Shogun collapsed from anxiety. As the Bafku on the verge of destruction, Tokugama Sada Sada replaced him and rebuild the Bafku. People called him the "Enlightened Monarch".
He would use later disband Oniwabanshuu ninja and uses Naraku for his services.
He retires and now serves as an advisor to the current Shogun Tokugawa Shige Shige and holds immense power over Edo by controlling Tokugawa Shige Shige.
He is cruel.