From the Super Mario Wiki
“Putting on badges and taking them off is a vital skill.”
Goompa is Goombario and Goombaria's grandfather. He is an elder Goomba and has extensive knowledge of the world. In fact, Goompa taught his grandson everything he knows. His knowledge of the world comes from his adventures as a youth. In his prime, he used to travel the globe with his friends Koopa Koot and Bootler and today suffers from back aches.
Goompa lives in Goomba Village with the rest of his family. In the beginning of Paper Mario, Goompa is fixing the veranda of their home with a Hammer. When Mario attempts to leave the village, Kammy Koopa appears and, using her magic, creates a yellow block that prevents Mario from leaving. Mario decides to ask Goompa for his Hammer and walks to the veranda. Unfortunately, the veranda has fallen apart, causing Goompa and Mario to plummet to the ground below. In order to get back to the village, Goompa temporarily joins Mario, and in lieu of fighting, he teaches Mario how to use the game's battle system and gives Mario his Hammer after it is found.
One of the favors that Koopa Koot asks of Mario is that he retrieve a Tape that had been lent to Goompa a long time ago. When Mario retrieves the tape, he is curious of its contents, but Goompa refuses to tell him what is on the tape, commenting only that he enjoyed listening to it.
Goompa is for the most part an average Goomba. The only things different are the bushy white eyebrows and his green hat. Also, he usually has a smile on his face.
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