In Japan such kids are called ha-fu, the Japanese pronunciation for "half" (half-Japanese, half another race). Such people, while sometimes teased as kids (not our experience at all), are often later in life the object of admiration/envy for having the combined beauty of two races as opposed to one (often our experience): namely larger eyes and browner hair, a highly desired trait among many Japanese young people these days who have their eyelids widened and dye there hair lighter shades. Take a look at any pop fashion/music mag in Japan for prime examples.
Tiger Woods is a good example here in the US of a good-looking "bi-racial" person who seems very self-confident about himself.
Joshua sounds like he's simply carrying the racial "baggage" of his parents.
Japan * ping * (kono risuto ni hairitai ka detai wo shirasete kudasai : let me know if you want on or off this list)
I have found that any race mixed with Japanese is quite beautiful.
Well, I'm going to disagree with you on this one. I'll write more later.