Iris Wildthyme and the Celestial Omnibus (in-universe)

Iris Wildthyme and the Celestial Omnibus was a book depicting events from Iris Wildthyme's life. Iris, the Celestial Omnibus and Panda wearing a tailored tuxedo were visible on the cover. (PROSE: The Big Crunch)

Behind the scenes
A version of Paul Magrs does exist within the DWU, but, not unlike Marked for Life, there is no narrative confirmation that the books are written by the in-universe Paul Magrs.