Board Thread:Questions and Answers/@comment-5872914-20131117064230/@comment-3445779-20131117072232

It's true a BMI would say that the characters would be underweight/anorexic, but you have to put into consideration that the series takes place in Japan and people there do tend to weigh less due to their life style and diet.

Also you got to remember, this is a fictional series. So you shouldn't put too much thought into the characters weight or height. ^^;