Yes.
Kingdom Hearts (original) (English) Kingdom Hearts Final Mix (Japanese/English)
Kingdom Hearts II Final Mix+ is a Japanese game. Although the voice acting is only in Japanese, there is an option to enable English subtitles.
No you don't, but the typing will be in Japanese, and the parts that weren't in the English Kingdom Hearts II, will have the Japanese voice actors speaking. So if you want the Final Mix, you'll need to learn Japanese!
You cannot watch or play Kingdom Hearts Final Mix in English.
There are several Japanese versions of Kingdom Hearts. You can either buy them in Japanese or get the Final Mix for one of the games.
Nope but they always speak English but text is Japanese and you can't change it.
You don't upgrade it. The final mix is a completely different game. And it's only available in Japanese. The game doesn't even work on a English ps2.
That is only in Japanese (unless you can read Japanese)
Kingdom hearts II final mix is an extended Japanese version of Kingdom hearts II with more bosses including Terra from birth by sleep and a bonus secret ending.
Not as of now
No. Although most Kingdom Hearts titles have been translated and released in regions other than Japan, there are a few games that are Japanese-only. The 'Final Mix' games (Kingdom Hearts Final Mix and Kingdom Hearts II Final Mix+) are Japan-only, but have an option for English subtitles. The only all-Japanese Kingdom Hearts title would be Kingdom Hearts Coded for the mobile phone. This game was released only in Japan, and isn't scheduled for release in America or any other PAL region.
No i think that is on kingdom hearts 2 final mix plus but that one is in Japanese