Mori Soiken was a real life historical figure, and amakusa shiro's mentor/strategist. In Makai Tensho, Mori Soiken is a sadistic, manipulative and cruel satanist who resurrects shiro, mataemon araki and several other samurai warriors into demons in order to bring earth to Armageddon. His worst deeds include lying, slander, and murdering children. for example when shiro asks jubei to protect the people during the war, mori slaughters two children, brings out their decapitated heads, shows them to shiro, and lies to him by telling him that jubei did it, even though jubei was in fact not responsible for their deaths. Mori also has a daughter called Ocho, however Mori does not care about her, since he sacrifices her for shiro's resurrection.