Well, in such a fanfiction, Naruto would likely lose all his skills and knowledge as a ninja. He'd be completely dependent on others for care, like eating baby food and being diaper - changed. Maybe his friends would have to protect him from the enemies who might see this as an opportunity to get rid of him once and for all.
His friends like Sakura and Sasuke might step in to take care of him. Sakura, with her nurturing side, could handle feeding and cleaning him. Sasuke, though he might seem reluctant at first, would probably also protect the baby Naruto from any threats.
One possibility could be that Naruto is drawn to boxing because of its physicality and the determination it requires. He might see it as a new way to test his strength and endurance outside of ninja battles. Maybe he starts training with a local boxing coach who sees his potential and helps him develop his skills.
In this fanfiction, it could start with Katara being too curious about a mysterious relic. When she touches it, she suddenly transforms into a baby. Aang, being her friend, feels a strong sense of responsibility. He tries to communicate with her in her baby form, which is difficult. Sokka, on the other hand, is more worried about how they're going to keep her safe. They search for a wise old bender who might know how to change her back. Along the journey, they face various challenges and also learn more about Katara's past as a baby through some sort of magical visions.
Well, it could be about the Joker somehow getting transformed into a baby. Maybe he retains some of his villainous traits even as a baby, causing chaos in a comical way. For example, he might still have that evil laugh and try to play pranks on the other characters in the story.
One idea could be that Sonic, through some magical or scientific accident, is transformed into a baby girl. In the fanfiction, his friends might initially be very confused. For example, Tails could be trying to figure out how to reverse the process while also taking care of Sonic in his new form. Sonic, as a baby girl, could have different abilities or limitations. Maybe she can't run as fast as before but discovers new powers related to cuteness or charm that help the gang in unexpected ways.
The other characters in Sonic's world would have a range of reactions. Some of the minor characters might be frightened or confused by Sonic's new appearance. The Chaotix group could be called in to help investigate the situation. Vector might be more interested in the mystery of how it happened, while Charmy might be curious about Sonic as a baby girl and try to play with her. Espio would be more focused on the potential danger and how to solve the problem quickly.
One possibility is that Naruto, with his determination, could adapt Zeref's powers in a unique way. Maybe he'd use Zeref - like magic to enhance his ninjutsu. For example, he could infuse Zeref's death - based magic into his Rasengan, creating a more powerful and dangerous attack. Another aspect could be Naruto's personality change. If he becomes influenced by Zeref, he might become more brooding and less of the cheerful ninja we know. However, his core values of friendship and protecting the village would still likely be there, just warped a bit by Zeref's dark nature.
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.
In the 'Naruto Becomes Super with IQ 500' fanfiction, Naruto's newfound intelligence could lead to him making amazing scientific breakthroughs in the ninja world. He could understand the chakra system on a whole new level and develop new jutsus that are far more powerful and efficient. His IQ would also help him in diplomatic situations, allowing him to negotiate better treaties and alliances for the Hidden Leaf Village. This would change the power dynamics not only in his village but across the entire ninja world.