Well, it could be really exciting. Maybe Naruto would learn some unique fighting techniques from Sub Zero. He might gain new ways to control his chakra, inspired by Sub Zero's ice powers.
Obviously, Naruto and Sub Zero are the main characters. Naruto is the one being trained, and Sub Zero is the trainer.
It could be really exciting. Guts' brutal and unyielding training methods might make Naruto even stronger. Naruto could learn to face his enemies with more tenacity from Guts. For example, Guts' way of fighting in close combat could be incorporated into Naruto's combat style, adding a new dimension to his abilities.
In such a fanfic, Naruto might gain some really unique powers. Maybe he could learn to control nature in a more divine way. For example, he could make plants grow instantly to use as cover in battles, like creating a forest out of thin air. His physical strength could also be enhanced in a special way that is different from normal training. And his understanding of the ninja world might be deeper as Kami could give him insights into the origin and purpose of ninjas.
The 'naruto trained by the three sannin fanfic' would likely be full of intense training sessions. Naruto, under Jiraiya's guidance, could learn more about Sage Mode and how to gather natural energy more efficiently. Tsunade might teach Naruto how to use his chakra for precise medical treatments as well as powerful strikes. With Orochimaru, Naruto could explore the secrets of some ancient and powerful jutsu. This would not only make Naruto stronger physically but also mentally. He'd have to deal with Orochimaru's devious nature, Tsunade's strictness, and Jiraiya's carefree yet effective teaching style. And his relationships with his friends and the village would also be affected as he becomes more powerful and knowledgeable.
The story in 'naruto trained by sakumo hatake fanfic' could be full of surprises. Sakumo could introduce Naruto to some of his old comrades or tell him stories about the early days of Konoha. This would give Naruto a deeper understanding of the village's history. And with Sakumo's training, Naruto might become even more powerful than in the original series. He could develop new strategies for fighting enemies like Akatsuki, and his relationship with other characters in Konoha might also change as a result of this new training.
The storyline could be really exciting. Naruto's already strong with his ninja skills, and if trained by Whitebeard, he'd gain new abilities. Maybe he'd learn about the power of the sea and how to use it in combat. He could also pick up on Whitebeard's leadership skills and sense of family within a crew, which would be a new concept for Naruto used to his ninja village.
Well, it could be an action - packed fanfic. Maybe it starts with Kitana on a mission in her realm and Sub - Zero somehow gets involved. They might initially be at odds because of their different loyalties, but as the story progresses, they realize they have a common enemy and start to work together. Their unique fighting styles would make for some exciting battle scenes in the fanfic.
If Naruto becomes Sub - Zero, his relationships would also be affected. His friends in Konoha might be a bit scared or at least very surprised at first. But Naruto being Naruto, he would try to show them that he's still the same person inside, just with different powers. And he might also make new friends in the Mortal Kombat - like world where Sub - Zero comes from, if that's the context of the fanfiction.
One possibility could be that Naruto is transported to the Mortal Kombat universe and through some magical or technological means, he takes on the powers and identity of Sub - Zero. Maybe he has to adapt to the new combat styles and the brutal nature of the Mortal Kombat world while still retaining some of his Naruto - like traits such as his determination and never - give - up attitude.
Yes, there are likely fanfictions out there with the concept of 'Naruto is Sub Zero'. You can start by checking popular fanfiction websites like FanFiction.net or Archive of Our Own. They have a vast collection of fan - created works and you might find some interesting crossovers with this premise.