Aspose word seams not support the font style “Emphasis mark” which is popular in Chinese. I cannot insert a run with “Emphasis mark” font style.

Thank you very much. I also very much look forward to see this feature in next release.
The issues you have found earlier (filed as WORDSNET-13983) have been fixed in this Aspose.Words for .NET 20.6 update and this Aspose.Words for Java 20.6 update.
Starting from the 20.6 releases, we have added support in Aspose.Words for .NET and Aspose.Words for Java APIs to add Emphasis Marks to the Text in Word document using C# or Java. The emphasis mark is an additional character that is rendered above or below the main character glyph as specified in the enumeration below. We have added the following new public property and enumeration in Aspose.Words API:
The following C# code example explains as to how to set Font.EmphasisMark via DocumentBuilder:
Document document = new Document();
DocumentBuilder builder = new DocumentBuilder(document);
builder.Font.EmphasisMark = EmphasisMark.UnderSolidCircle;
builder.Write("Emphasis text");
builder.Writeln();
builder.Font.ClearFormatting();
builder.Write("Simple text");
document.Save("E:\\temp\\20.6.docx");