The consensus among major league scouts working in Asia is that the Korean body type best fits the major league profile. Koreans are on average the tallest and largest people in Asia.

Despite the fact that Korean baseball talent is in somewhat of a lull right now–definitely behind Japan and nearly, if not already, behind Taiwan–major league scouts are paying more attention than ever to young Korean ball players.
A recent article in the Korean paper the Chosun Ilbo cites the example of 18-year-old swimmer (and high school student) Park Tae-hwan, who last week whipped 2004 silver medalist Grant Hackett of Australia in the 400-m freestyle during last Tuesday’s International Swimming Competition. It is expected that Park will challenge for the gold in next year’s Olympics in China.
The chosun writes:

While Park Tae-hwan is only 3.21 cm taller than the average 178.29 cm of Korean national swimmers since 1998, his shoulder width is 46 cm, a noticeable 6.32 cm wider. His arms fully stretched measure 190 cm, about 5 cm longer than the average.

In another article from the Chosun entitled Physiological Changes Bring Koreans Closer to West it is reported that Korean bodies are becoming so similar to their western counterparts that even their heads and faces are decreasing in size.
It’s good to know that with all these young Korean players possibly being drafted to play for major league teams that the helmet sizes won’t need to be drastically changed to accommodate.