Paper Peach

Paper Peach is the paper form of Princess Peach that appears in Mario & Luigi: Paper Jam she is Peach from the Paper Mario series. Alongside many other paper characters Paper Peach came out of a book Peach was depicted in her paper form in the Paper Mario series but there is no indication that those games took place in the book.

History
Paper Peach along with Peach were kidnapped by Bowser and Paper Bowser after Mario, Luigi and Paper Mario explore a certain area of Sunbeam Plains, they summon Petey Piranha to slow the trio down and after they beat Bowser Jr. and Paper Bowser Jr. they save the two Peaches. After Bowser and Paper Bowser are defeated, all the paper characters go back inside the book bidding farewell to their 3D-selves.