Interested in tangent replies to this, even if such fonts are artistically unsuitable for games - are open source fonts OK for Japanese? I understand that Unicode denotes single characters for both Chinese and Japanese (and Korean outside of Hangul?) even though there are differences between how nations write these 'single' characters, so the result is a Unicode font will look like a Chinese font, or a Japanese font, but not both.

How do the big Unicode OSS fonts like Noto, Deja Vu deal with this?