Ghost Goomba

Ghost Goombas (generically referred to by Nintendo Power as ghosts ) are Boo-like ghosts of Goombas found in Super Mario Land 2: 6 Golden Coins. They are only present in the third level of the Pumpkin Zone. True to its appearance, the Ghost Goomba is invincible like a Boo, but moves and acts like a Goomba. Green Shells and Stars are effective in defeating it.

Perfect Ban Mario Character Daijiten
''' テレクリボー 　ゴースト族 　未練がましい ゲーム　ランド2 ''' クリボーのおばけだ！  あのクリボー（P72）がおばけになったもの. おばけは実体が無いので、マリオの攻撃を全く受け付けない. しかも、動きも銳いので、急いで走り抜けるようにしよう.

 Ghost Goomba  Tribe: Ghost clan Disposition: Regretful Game appearances: Land 2 ' It's the spirit of Goomba! ''The Goomba (p. 72) has become a ghost. The ghost has no physical form and is totally immune to Mario's attacks. Mario must run through it quickly, as it moves in a very unpredictable manner.''

Trivia

 * Ghost Goombas have an unused squished sprite, indicating that they originally could have been stomped.
 * In a KC Deluxe mini-guide, Ghost Goombas are referred to as the ghost of Chibibo. In actuality, Ghost Goombas are approximately the size of regular Goombas and even slightly bigger than the game's Boos.
 * A Ghost Goomba appears in the concept art of Super Mario Odyssey, suggesting they may have been planned to appear in the game somewhere early in development.