When you import a font, you can set which glyphs you need. Also, you can change the size of the page that the glyphs get saved to. For my Japanese font, I’m using 512x512. And I think you can change the default fonts in [YourGame]\Localization[3-letter language code]\GFxUI.[language code]. In that file, create a [Fonts] section and fill it in with the font you want to use:
[Fonts]
TinyFontName=RPGTacContent.Fonts.Japanese_16
SmallFontName=RPGTacContent.Fonts.Japanese_16
MediumFontName=RPGTacContent.Fonts.Japanese_16
LargeFontName=RPGTacContent.Fonts.Japanese_16
SubtitleFontName=RPGTacContent.Fonts.Japanese_16
If you do that, can you use Chinese characters in your game?