The word "very" can be used as an adjective, meaning real or actual. So you can say "very American". But I challenge you to drop the word "very" from your vocabulary, especially in writing. It is overused.

No you cannot use very ^^ instead of using "very", use "so" pronounced as "sow"... ^^ very is used in, example: "its very hot today" "very pretty" very means, so much. you're a japanese right? very means taihen ^^ "He is so American" But, on the other way. You can still use "He is VERY American" but it seems fragment. It needs a continuation of the sentence.

Very could be used in this way, but more common in oral English. Very here means "to be typical of ", meaning he is a typical American or Janpanese. But I have on doubt here. I think it should be "American" or "Japanese", that is, adjective, instead of America or Japan. Hope more professional people could give you better answers.

Kyoto is a place that is very Japanese! I see ! Thanks so much:)

yamy san, Very has two meanings 1) in a high degree; extremely; exceedingly: as in 'An apple is very delicious'. or 2) it is used as an intensive emphasis or stressing identity or opposite as in 'He is very handsome' If you are using the first sentence 'He is very American' as a means to emphasis his American-ness, then yet, it would be correct. But the second sentence would be incorrect and might be better worded as 'Kyoto is a place that is very Japanese.'