Currently, the Apache FOP ( which converts EAD XML to HTML then HTML to PDF ), lacks fonts for certain languages/glyphs ( such as Chinese ) .
We need to add a way for end users to add additional fonts.
Need input from development team on the feasibility, but I think it's generally a good idea to support as many fonts as possible.
The recently filed issue https://archivesspace.atlassian.net/browse/ANW-835 gives a more specific (and current) example of this. The more general version of that specific issue is the open issue https://archivesspace.atlassian.net/browse/ANW-758.
See that added some fonts for a way to resolve.