Shirou Tokisada Amakusa is a video game character from SNK Playmore's Samurai Shodown series of fighting games.

According to his official biogrpahy, Amakusa was born in Nagasaki between 1621 and 1623, and died February 28, 1638. He stands 1.81 metres; his weight and blood type are unknown. His weapon is a crystal sphere named "Gadamar." His distinguishing features are his wild red hair and huge multicoloured robe.

Amakusa is loosely based on a character from Makai Tensei , who was in turn based on the historical figure of the same name. Shirou Tokisada Amakusa led a Christian rebellion in the Shimabara region. The Bakufu army crushed his revolt and executed him. He made a deal with the demon Ambrosia, and returned to the mortal world 150 years later, possessing the body of Hattori Shinzo, the son of Hattori Hanzo. In his attempt to bring Ambrosia to the mortal world with the power of the Palenke Stone, Haohmaru and Nakoruru killed him.

This time, Amakusa was split into two forms: good and evil. The evil, blue-skinned Amakusa resurrected Minazuki Zankuro , but could not control him, so he sealed him in stone. He then kidnapped Kazama Hazuki and used her to maintain his demon castle in Shimabara. The good Amakusa planned to stop his evil counterpart, but Kazama Kazuki killed the evil incarnation, and Rashoujin Mizuki sealed him.

When Amakusa freed himself, he fought Mizuki, and saved the souls of Haohmaru, Yagyu Jubei, Senryo Kyoshiro , and Neinhalt Seiger before Mizuki destroyed him.

Shirou Tokisada Amakusa has been voiced by Eiji Yano in many of the games he appeared in.