PDFCreator can put a “stamp” in the center of each page of the document. The stamp text can be set here. Furthermore, you can change the stamp font, color, size, and determine whether the text should be filled or drawn as outline.
You can only use TrueType fonts here. Windows does support other formats (ODF, TTC), but they will not be displayed in the font list and can’t be used in PDFCreator.