Goombetty is a female Goomba that looks like the round Goombas encountered on Dinosaur Land during Super Mario World.
She appears in the game Mario Party Advance as Goombob's crush. One of the game's missions involves finding a seashell for Goombob to give her. After Goombob givers her the shell the player collects, Goombetty arrives at the manor, and Goombob gives her the shell and asks her on a date. Goombetty accepts, and leaves to prepare. The ending of the game says that Goombetty loves Goombob madly, and she has made a hobby of collecting seashells.