Shiro Tokisada Amakusa/Story

Past
Prior to the events of Samurai Shodown, Amakusa is resurrected by the dark god Ambrosia. He incarnates into the world of the living in preparation for his own revival. He soon ursurps the evil that held Shizuka Gozen and gains more power.

Samurai Shodown
To fully incarnate with his power, he uses the body of Shinzo Hattori (one of Hanzo's sons) and possesses him. His main plot involves him stealing the Palenke stone, which he intended to use to bring Ambrosia to the mortal world. Haohmaru prevents this from happening by defeating him. In Galford's ending in the same game, it is shown that Amakusa isn't truly evil, thanking Galford for freeing him from Ambrosia's clutches.

Samurai Shodown IV
Upon his resurrection in Samurai Shodown IV, his spirit splits into two halves: one good and one evil. Amakusa seeks to reunite with his more powerful and malevolently evil other half, who was bent on dominating Shimabara and eventually the whole world, as well as reining in this evil power, but was unsuccessful as his evil counterpart was slain by Kazuki. His continued existence after his evil half is destroyed is mostly because of his host body Shinzo.

Samurai Shodown II
During the events in Samurai Shodown II, he saves certain characters from Mizuki's wrath but because of the demise of his evil half, he isn't as powerful as he once was and is defeated, leaving only Shinzo's body for Hanzo to claim.