Who are the most famous figure skaters?

Most famous where?

Japanese heritage or citizenship?

In the US, you could possible count Kristi Yamaguchi as she's of Japanese heritage but not citizenship.

In Japan, Midori Ito, Yuka Sato, Shizuka Arakawa, Mao Asada, and Miki Ando are all very famous. As well as Daisuke Takahashi.