oh and I just noticed that spin13's sig isn't proper english either. It either missing a word or some punctuation inbetween the words 'least' and 'fact.' Just throwing it out there....
You are correct and I have no excuse for that. However, I wont fabricate an excuse to avoid responsibility nor will I apologize for my humor and I will correct my mistakes when discovered or pointed out. Will you?
As for relevancy to the original topic, though unfortunately not a direct answer to the questions posed, I think it is safe to say that nearly every well-established and -known subculture found in the States finds representation in Tokyo. With a population of approximately 10 million, along with the millions living in the surrounding areas, combined with a sometimes freaky adoration of Western culture, this should not be a surprising fact. So yes, if you're asking about the "gothic subculture" (however you define that), you'll likely find it in Japan. Is it common? That depends on where you live. Are budo and ikebana popular where you live?
On an almost unrelated topic, gothic typeface is one of the most common fonts used for printing kana and kanji in Japan.