Wrote the Malaussene series of detective novels, slightly tongue-in-cheek, featuring Benjamin Malaussene, professional scapegoat, his huge clan of siblings, all by different fathers, and his extended family in the Parisian micro-village of Belleville.
After that the series fragments a little... in number 3 Malaussene is apparently killed (but revived later). In 4 things go even further.
He also wrote CommeUnRoman?, which among other things sets out the inalienable rights of the author ... and of the reader.
Pennac's "reader's rights" :