The Autograph is an item that appears in the Paper Mario Series. The signatures in Paper Mario are from Luigi and Merluvlee, the Excess Express Engineer from Paper Mario: The Thousand-Year Door, and Merlumina from Super Paper Mario. Mario would have to get Koopa Koot two autographs in Paper Mario before giving him three Star Pieces from Merluvlee's autograph and a single coin for Luigi's autograph.
The Bob-omb Boy on the Excess Express in Paper Mario: The Thousand-Year Door, Bub would want the autograph of the trainers engineer as he wants to be one himself when he grows up. Mario would get a Shine Sprite for giving him the autograph.
In Super Paper Mario, Old Man Watchitt would want to get Merlumina's autograph. Mario would have to get the autograph from the temple where her spirit rests. Mario will receive the You-Know-What, to get Piccolo. One of the optional Pixls.