I have roughly >doubled the size of my (Japanese) anime/manga biracial character database to 273 characters by exploiting some databases I was ignorant of before, like AniDB & VNDB: http://www.gwern.net/hafu#list

This large expansion adds substantially to the statistical quality of any conclusions I'll draw. So far the only new thing I've noticed is that there is now a glaring absence of Korean characters in my database, despite the long intimate history of Korea & Japan, and the fact that without even looking or compiling a similar database, I have found ~4 half-Japanese characters in Korean works.

I also split out my iodine info and meta-analysis as a separate page: http://www.gwern.net/Iodine

I've done some further work on my dual n-back meta-analysis as well: regressing against time allotted for IQ test (no effect) and hopefully soon against the type of IQ test (hypothesis: BOMAT tests inflate IQ improvement estimates).