The integration could involve Naruto's chakra system. In GTA 5, his chakra could be like a special power -up. For instance, if he uses his chakra to enhance his strength, he could lift heavier objects or break through walls more easily. Also, his ninjutsu could be used for stealth. He could turn invisible like when using the Hidden Mist Jutsu to sneak around in the GTA 5 world and gather information or steal valuable items from the gangs or corrupt businessmen.
One way could be by having Naruto's ninja skills translate into the GTA 5 world. For example, his ability to run fast and jump high could be like a special ability in the game. He could use his shadow clone jutsu to confuse enemies during heists or missions. Maybe he'd team up with some of the GTA 5 characters and teach them his ninja ways. This would add a whole new dynamic to the GTA 5 gameplay and story.
Well, in a Naruto x GTA 5 fanfiction, the world of Naruto could be mashed up with the setting of GTA 5. Naruto could be a new character in Los Santos. His unique fighting style would make him stand out. He might start off as a stranger in the city but then get involved in the criminal underworld or the political chaos of the city. His goal could be to find a way back to his own world while also trying to make the city a better place using his ninja values.
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