Paper Mario is available from my own papercraft webpage ([link]) unfortunately the original site that made the paper Bowser is gone, but you can still find it on other sites with a bit of searching. ;o)
I remember trying to build that Bowser for my first papercraft model. I never could figure it out, so I built something else. If you look in my gallery, you can see I'm trying to design my first papercraft model, a Black Mage with the Blender tool. Do you have any advice for exporting the model into Pepakura? Or do you use a different tool to unfold a model into a papercraft design?