Patrick is a postman. His first (and so far only) appearance is in Cardboard Copy. In Cardboard Copy, after Gabriel harshly refuses to sign for his (Gabriel's) package, Patrick is Akumatised into the title villain. After getting Adrien's signature from Laddybug (who is actually Adrien), he de-transforms and the Akuma is changed into a butterfly. Patrick, then having a valid signature, presumably goes to deliver his last package.