Shinkuro Isaka is a prominent antagonist in the series Kamen Rider W. He is a highly skilled surgeon with a twisted fascination for Gaia Memories, which grant users extraordinary powers. As the Weather Dopant, Isaka becomes one of the most dangerous foes faced by the protagonists, using his weather-manipulating abilities to commit crimes and further his own ambitions. His cunning intellect, cruelty, and unique powers make him a formidable adversary, leaving a significant impact on the story and its heroes.