Goombules are a sub-species of Goomba as an organism Goomba reigning inside of Bowser's body in Mario & Luigi: Bowser's Inside Story and Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey.
Goombules resemble Goombas, but have a dark pink egg-yolk shaped body with an orange nucleus in the center. They also have black eyes and yellow pupils.
These enemies can be attacked by being jumped on, hammers, or by special attacks. They are also known to be the weakest enemies in the game. When they attack, they run to the bro. they want to attack if they ram into them. If they use their rolling attack, they point their foot in the direction, depending on which bro. they are going to attack and then roll at them. Both of their attacks can be countered via jumping. When Mario and Luigi gain a new Special Attack, they are the enemies shown in the demo to be attacked. When they are defeated, they may drop a Mushroom or Syrup.
- Their name is a portamanteau on "Goomba" and "globule."