A family of Microsoft word processing software products for creating web, email, and print documents.
Either John is mistaken or you've misinterpreted him, since the Default Paragraph Font is the default font for a given style (not the document default). This means that if you create a character style whose only attribute is red color and apply it to a Normal paragraph in which the font is TNR 12 (with Automatic color), it will still be TNR 12 but red. If you apply the same character style to a heading that is Arial 16 (and Automatic), it will still be Arial 16 but red.
If a character style is based on "underlying properties" of selected text (including those applied as direct formatting), then it could conceivably apply Bold even though neither the style of the original paragraph on which it was based nor the style of the text to which it is applied includes Bold.