Shotaro Hidari is one of the two main protagonists in the tokusatsu series Kamen Rider W (Kamen Rider Double). As a self-proclaimed 'hard-boiled' detective, Shotaro partners with Philip to become Kamen Rider Double, sharing one body to fight Dopant criminals in Fuuto City. The 'Luna Joker' form represents the combination of Shotaro's Joker Memory and Philip's Luna Memory, granting unique powers. Shotaro is characterized by his strong sense of justice, determination, and caring nature, playing a crucial role in protecting the city and solving cases.