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FILE - Doraemon, one of the most popular animation characters in Japan, participates in a kick-off ceremony of the Tokyo's bid to host the 2020 Olympics in Tokyo when Tokyo is bidding against Istanbul and Madrid to host the 2020 Olympics on Aug. 23, 2013. (AP Photo/Koji Sasahara, File)

FILE - Doraemon, one of the most popular animation characters in Japan, participates in a kick-off ceremony of the Tokyo's bid to host the 2020 Olympics in Tokyo when Tokyo is bidding against Istanbul and Madrid to host the 2020 Olympics on Aug. 23, 2013. (AP Photo/Koji Sasahara, File)

Nobuyo Oyama, best known for her raspy voice of Doraemon, the world’s beloved cat-robot from the future, speaks during an interview in Feb. 1999, in Tokyo. (Kyodo News via AP)

Nobuyo Oyama, best known for her raspy voice of Doraemon, the world’s beloved cat-robot from the future, speaks during an interview in Feb. 1999, in Tokyo. (Kyodo News via AP)

FILE - Models of Doraemon, one of Japan's most popular manga and anime characters, are displayed in Shanghai on April 28, 2013. (AP Photo/File)

FILE - Models of Doraemon, one of Japan's most popular manga and anime characters, are displayed in Shanghai on April 28, 2013. (AP Photo/File)

Nobuyo Oyama, best known for her raspy voice of Doraemon, the world’s beloved cat-robot from the future, speaks during an interview in Feb. 1999, in Tokyo. (Kyodo News via AP)

Nobuyo Oyama, best known for her raspy voice of Doraemon, the world’s beloved cat-robot from the future, speaks during an interview in Feb. 1999, in Tokyo. (Kyodo News via AP)