Mega Koopa is an enemy that appears in Super Paper Mario.
The Mega Koopa can only be encountered in The Bitlands of Chapter 3-1. A regular Koopa Troopa sees the heroes coming and manages to find a Mega Star to transform into the Mega Koopa. The Mega Koopa is then able to take out anything in it's path. However, despite this, the Mega Koopa can be easily taken out in one hit when one of the heroes use a Mega Star of their own.