Paper Bowser is the incarnation of Bowser that appears alongside Bowser himself in Mario & Luigi: Paper Jam. Alongside various other paper characters, Paper Bowser came out of a book containing a whole paper world. Bowser was previously depicted in a paper form in the four Paper Mario series games, but there is nothing suggesting that those games took place within the book world introduced in Mario & Luigi: Paper Jam instead of being the regular Bowser simply in an paper art style form of the normal world.