|“||Come, let me cure you of the disease called "life".||„|
|~ Shiro Tokisada Amakusa|
Shiro Tokisada Amakusa is a recurring villain from the Samurai Shodown series, appearing as the main villain in Samurai Shodown and Samurai Shodown IV: Amakusa's Revenge. He is also one of the main antagonists in Makai Tensho.
While he was still alive, Amakusa led a rebellion against the Tokugawa Shogunate, but his army was defeated and he was executed by them. Growing a deep hatred against not only the Tokugawa, but the whole world, his soul was never able to rest, wandering the darkness with only vengeance in mind. A century later, he makes a pact with the dark god of Makai, Ambrosia, and is brought back into the world of living by possessing the body of a young ninja who was the son of the ninja master Hattori Hanzo. He then makes his move to bring Ambrosia into the world by stealing the Palenke Stone, using it to cast a series of calamities throughout the world, causing plagues, war outbreaks, disasters, and unbalancing the nature. The world quickly fell into chaos, so a series of warriors, each one with his own motives, set on their own journeys, as if drawn together. Haohmaru, a skilled samurai who wanted to perfect his skills, hears of the disasters and the arrival of Amakusa, so he decides to challenge him. With the help of other warriors, he defeats Amakusa, an this seemed to be the end of his twisted plans. However, his death at the hands of Haohmaru split his soul into two halves: the good and the evil Amakusa.
Roughly a year later, both halves are able to resurrect. His good side tries to search for his other half to become one again, but his evil side erects a magic castle by using the young sorcerer Hazuki Kazama and resurrects Zankuro Minazuki, an evil warrior with immense power. But his plans are stopped by Kazuki Kazama, brother of Hazuki. After he is defeated, Zankuro escapes from Amakusa's control, cutting him in half with his immense sword. With the evil side killed for good, the good side is unable to reunite.
His good side tries to pay for his sins, but he is sealed off by Mizuki Rashoujin because of his betrayal against Ambrosia. He manages to break the seal and escape, and tries to help the warriors who are trying to stop Mizuki, but Mizuki destroys his soul, who leaves the body of Hanzo's son.
Amakusa is completely twisted, blinded by his desire for revenge. His good side tries to make up for his evil side.
- It is implied that Shiro from Kinji Fukasaku's Makai Tensho movie adaptation is bisexual, as he is shown kissing one of the supporting male characters.