From the Super Mario Wiki
The Green Magikoopa (abbreviated as GRN Magikoopa in Paper Mario and G. Magikoopa in the sequel) is a Magikoopa that appears in both Paper Mario games. In Paper Mario, it had the power to increase the defense of other foes. They reappeared in Paper Mario: The Thousand-Year Door. They have the power to give other enemies the Invisible or Electrified status. Sometimes, it rides a broom, but this doesn't affect his stats in any way, except that hammer attacks will miss.
In Mario & Luigi: Dream Team, Kamek creates a green-robed clone of himself called Kamek (Green) to assist him in his third battle against the Mario Bros. in Dreamy Neo Bowser Castle. This clone can raise the DEF of Kamek, his other clones and itself just like Green Magikoopas in Paper Mario, but can also raise their SPEED and POW as well.
Green Magikoopas appear in Puzzle & Dragons: Super Mario Bros. Edition, as enemies and allies that the player can use against other enemies. Instead of wearing blue shoes and having a blue jewel on their wand like they do in the Paper Mario series, they now wear brown shoes and the jewel on their wand is red. Its attribute is Wood.
Paper Mario Stats and Tattle Information
Names in other languages