Who are all the bad guys in paper Mario ttyd?

The nefarious 'Shadow Mario' is none other than Bowser Jr., Bowser's son . Bowser convinced his son that Peach is his mother and that Mario is the, as Bowser Jr. himself said, 'bad guy'. So Bowser Jr. kidnaps Peach, all the while smearing good name of Mario by making it look like he (Mario) was responsible for all of the graffitti and the dissappearance of the shine sprites.