PR 3960 display on my Linux works well, and the combination of the Chinese characters has no political controversial.

But it is lack of simplify characters, the only one is '汉', others are all traditional characters (or they are same in simp. and trad.).

For Japanese, there are katakana (カタカナ), hiragana(ひらがな) and kanji (漢字), the characters you provide only contain hiragana. Maybe a sentence that contains all kinds of characters will be better.

For Korean, the characters are compound to one, but I'm not sure will they use the first four characters to test the font. CC for corona10.

For Chinese, Japanese, Korean, I'll still prefer and recommend to use a sentence to give user the perspective of the font.


For other character set, maybe we can reference from Google fonts:
https://fonts.google.com/
they got a list of Unicode-aware language:

    Arbic, Bengali, Cyrillic, Cyrillic Extended, Devanagari, Greek,
    Greek Extended, Gujarati, Gurmukhi, Hebrew, Kannada, Khmer,
    Latin, Latin Extended, Malayalam, Myanmar, Oriya, Tamil, Telugu,
    Thai, Vietnamese.