[tinyppl]

Yeah he can speak a few langs (which have been mentioned by above entries), but indeed, he still carries a heavy japanese accent which may make it hard to understand.

As for chinese (since I'm a chinese), I gotta say he's pretty good at it. He wrote good (though a little weird and unusual as compared to the current chinese lyrics) lyrics in chinese version of juuni gatsu no love song. As far as I know, he mentioned before that he learns chinese from his chinese friends. All I can tell is that he really does enjoy learning new things esp languages wise-

If I remember correctly, I read from somewhere that Gackt gave up learning cantonese because it was too tough for him.