A character with the Goro Goro no Mi ability would change the plot in terms of alliances. Other villages might form alliances with the village that has this powerful character. Or, the character themselves could form their own group of like - minded ninjas who are interested in exploring new forms of power. This would lead to a shift in the power balance between the villages and create new political and social situations in the Naruto story.
If a character had the Goro Goro no Mi, they might attract the attention of different factions in the Naruto world. Akatsuki could either try to recruit them for their power or see them as a threat. This would create new sub - plots as the character has to deal with Akatsuki's interest while also trying to fit into the ninja world. Also, in the Chunin Exams, their unique power would make them a standout competitor and change the dynamics of the fights there.