Yeah, like mizune said, she's half african-american, half korean. So she's no different from Amerie, like I said in an earlier post. There seems to be alot of mixed-race Japanese in the Japanese music industry this past decade and a half. Amuro Namie (Italian/Japanese), LISA (formerly of m-flo; Columbian-Japanese), Monday Michiru, AI (Italian/American/Japanese) One of the dudes from WaT is half white/half Japanese. Arashiro Beni...
As for the speaking english well... I've noticed several of the newer ppl and up and coming artists in the Japanese music industry either are from an English speaking country, or went to school there for a period of time. The earliest artist I can think of is Utada Hikaru (but by no means is she probably the first) who was born in NYC. Manhattan to be exact. Two of the guys from Homemade Kazoku have US connections, Micro grew up in Kentucky (his english still sounds whack to me), and Kuro who was born in Chi-town (his english sounds good b^__^). hmm.. who else... Of the m-flo crew, VERBAL went to school in Boston, and DJ Taku Takahashi went to school in LA and did DJ gigs there too. Prior to that, they both went to the same international school. Dunno LISA's background, but it's more than obvious she speaks impeccable English. More recently, Itou Yuna, is from Honolulu, Hawaii. AI is from LA. Heartsdales duo Rum and Jewels grew up in Hartsdales, NY (Rum was born in NY). The white dude from DEF TECH is from Hawaii. list goes on and on...
Maybe in the next decade engrish will be a thing of the past....
oh yeah... melody speaks perfect English too... I think she's from Hawaii. speaking of blogs, she also has a blog that's written in english, then re-written in japanese below the English. Verbal of m-flo has a blog too. You can comment on both their blogs... Give em a shout out in English and they'll get the message loud and clear.
Pic taken from VERBAL's(of m-flo) blog:

=) They look like they're having fun. I wonder what's that Ryohei's got in his hand.... didn't know the ppl m-flo collabos with are such good friends.