Evil Shiro Tokisada Amakusa (天草 四郎 時貞 (悪), Amakusa Shirō Tokisada (Aku)) is the evil side of Shiro Tokisada Amakusa. He is alternately referred to as "the dark half of Amakusa's soul." (闇側の魂, yamikawa no tamashii). He is the boss and main antagonist in Samurai Shodown IV. His purple skin indicates the malevolence of his ki energy. __TOC__