Bone Goomba

Bone Goombas are Goombas that wear skull helmets, which first appear in New Super Mario Bros. 2. Appearing alongside other bone-related enemies like Bone Piranha Plants and Dry Bones in Towers and Castles, they seem to be identical to ordinary Goombas in everything but appearance, slowly walking forward and being able to be defeated with any attack.

New Super Mario Bros. 2
Bone Goombas first appear in.

When defeated, the skulls on their heads are smashed, revealing that they have a completely blue body similar to the Gloombas from the Paper Mario series and the Goombas found in caves in Super Mario Bros. Additionally, they appear without skulls in, , and in the Gold Classics Pack.

Mario Party: Island Tour
Bone Goombas appear in Mario Party: Island Tour on the Star-Crossed Skyway board. They appear on the third Star Stage and give out five Mini Ztars.

Paper Mario: Color Splash
Bone Goombas make their Paper Mario debut in Paper Mario: Color Splash, where they are enemies that can be fought in Marmalade Valley. They are slightly stronger than regular Goombas, but otherwise act the same.

Paper Mario: The Origami King
Bone Goombas return in Paper Mario: The Origami King, where origami Bone Goombas appear as enemies in the Temple of Shrooms and Bonehead Island. A non-origami Bone Goomba also appears, attending a Sombrero Guy's canned food party at the Autumn Mountain. If Mario enters battle while the Bone Goomba follows him, it will aid Mario by attacking enemies with a Skullbonk move, which is similar to the headbonk move.

Mario Sports Superstars
Bone Goombas appear in Mario Sports Superstars as one of the playable sidekicks in the soccer sport, marking the first playable appearance of a Bone Goomba. Unlike regular Goombas, Bone Goombas are exclusive to soccer. They also serve as obstacles in the Road to Superstar mode.

Mario + Rabbids Kingdom Battle
In Mario + Rabbids Kingdom Battle, Bone Goombas appear as drawings imprinted on the sides of book shelves and bureaus found in several areas of Spooky Trails. These also feature Shy Guy masks.

Dr. Mario World
In Dr. Mario World, Bone Goombas appear in the backgrounds of World 11 and World 13 after they have been cleared.

Paper Mario: The Origami King

 * Gallery description: Goombas wearing tough skulls on their heads. Even in origami form, that's still pretty intimidating.