We’ve also had Japanese exchange students, and I’ve been to Japan several times. Most of young Japanese men and teenagers are not as skinny as Hanyu; even the Japanese singer in the picture shown by Li’Kitsu is not that skinny.
Hanyu would be considered skinny even put among Japanese men and women. It’s also obvious that he’s much skinnier than most other Japanese skaters, e.g., Daisuke, Kozuka, Oda, Tanaka, and even Shoma Uno.
I actually think Alissa, Asada, and Hanyu are some of the skinniest skaters around. And since Alissa is American, I think being skinny has more to do with individual skaters than with “ethnicity.”
Hanyu probably has the smallest waist and skinniest arms in the men’s field. Anyway for those who don’t like the super-skinny look, I heard he’s working on building muscles on his arms and legs, so I expect him to become more muscular (or more “normal”) in the near future.