Well, Naruto would become an even more formidable fighter. He could stretch his limbs like Luffy, which would add a whole new dimension to his combat style. He could reach enemies from a distance, or use his stretching abilities for quick evasions. This would make his already impressive ninja skills even more unpredictable and powerful.
Naruto's character would likely become more carefree. Luffy's powers often come with a sense of fun and adventure, and Naruto might adopt some of that. He'd be more likely to take risks and approach situations with a more light - hearted attitude.
In this fanfiction, the prototype powers could be something like an early form of chakra manipulation that is different from the traditional Naruto world's chakra use. It might be more raw and unrefined, with the potential for new and unique jutsu.
His hidden powers might be the ability to control all five basic nature types without any training. In the original story, Naruto had to work hard to master different nature types. But in a fanfiction, it could be that he has this innate ability which was hidden all along. This would make him extremely powerful and feared by his enemies.
In some fanfictions, Naruto's multiverse powers are portrayed as a way to bring together different versions of himself. Each version has its own set of skills and knowledge. By merging these aspects, he becomes an even more powerful and complex character, able to solve problems that were previously insurmountable.
Naruto's ninjutsu and Luffy's devil fruit powers would interact in really cool ways. For instance, Naruto could use his wind - style jutsu to enhance Luffy's attacks, making his Gum - Gum attacks even faster and more powerful. Luffy's ability to stretch could help Naruto reach enemies that are far away or in hard - to - reach places when he's using his Rasengan.
Naruto's character development would likely be a wild ride. Bill Cipher's powers are extremely powerful and otherworldly. Naruto could start to see the world in a different light. He may become more detached from the normal ninja way as he explores the limits of his new powers. This could lead to some conflicts with his friends, as they might not understand the new Naruto who has these strange and dangerous powers. He might also gain a new sense of arrogance at first, thinking he can solve all problems with his newfound abilities, but then have to learn humility through some tough experiences.
Well, Naruto could become a more stealthy fighter. With Rogue's powers, he might be able to absorb the chakra or abilities of his opponents, which would give him a huge advantage in battles. He could also use Rogue's power - related to stealth and misdirection - to infiltrate enemy bases more easily.
Well, he could use Freddy's power of entering people's dreams to fight his opponents in the dream realm. Maybe he would trap his enemies in a never - ending nightmare, causing them mental distress and weakening their will to fight in the real world.
Well, Naruto would probably become more confident. With all those devil fruit powers, he could be even more fearless in battles. He might start to rely less on his original ninja skills and more on the unique abilities from the devil fruits, which could change his fighting style drastically.