However, it's also possible that his powers are somewhat muted. Maybe his body can't handle the full extent of his powers in its baby form. So, while he still has some super abilities, they are not as strong as when he's an adult. This could make him more vulnerable to attacks from his enemies who might see this as an opportunity to take him down.
His powers might be affected in different ways. For example, his web - shooting ability could be less precise. Since he's a baby, he doesn't have the same muscle control and coordination as his adult self. So, the webs might come out in a more random direction.
His powers might not be affected much in terms of strength. However, the way he uses them could change. For example, his web - slinging might be a bit more graceful in his female form. Maybe his spider - sense could be more attuned to different things now, like more sensitive to emotions or subtler threats.
His powers would likely be severely limited. The Sharingan, which requires a certain level of mental focus and chakra control, would probably not work as effectively. As a baby, Sasuke's chakra system is not fully developed, so he might not be able to access the full potential of his powers. He might only be able to use the Sharingan in short bursts, like when he's really scared or in immediate danger.
It's possible that his powers would be more erratic. As a baby, he doesn't have the control he has as an adult. So, his ice - making abilities might go off randomly. For example, he could accidentally freeze the water in a nearby pond just by being near it while having a little tantrum. But as he grows and learns about his powers again, he would start to gain more control over them.
His powers might not be affected at all. Percy's connection to water is more about his essence as a demigod rather than his physical form. So he could still control water, summon sea creatures, and heal himself with water just as well as before.
I think Naruto would be one of the most affected. Since he and Hinata have a special connection, having her turn into a baby would completely change their dynamic. He'd have to step up and be responsible in a new way.
Lucy would be very affected. She's one of Natsu's closest friends. She'd have to take on a lot of responsibility for taking care of baby Natsu, which would disrupt her normal life of doing quests and writing her novel.
If Spider - Man had mutant powers in fanfiction, his origin story might be different. Instead of being bitten by a radioactive spider, he could be born with his powers. This would change his relationship with the scientific community. For example, he might not be as interested in science as the original Spider - Man. His powers could also be more uncontrollable at first, leading to different challenges in learning to use them.
The interaction of their powers would be fascinating. Harry's magic could be used to heal Spider - Man if he gets injured during a fight. Spider - Man's Spider - Sense could alert Harry of any oncoming danger, even magical threats that Harry might not be aware of immediately. Also, Harry could use spells to create distractions while Spider - Man uses his stealth to approach enemies unnoticed. This synergy between magic and superhuman abilities would create a very unique and exciting dynamic in the fanfiction.
Their powers could combine in a way that Naruto's chakra enhances Spider - Man 2099's physical abilities. For example, his strength and speed could be increased even more. Also, Spider - Man 2099 could use Naruto's shadow clone technique to create multiple copies of himself to confuse enemies while swinging around on his webs.
Another way their powers could combine is in the area of mobility. Spider - Man can move quickly through the city, but Elsa can create ice bridges and paths that can cross large gaps or even over water. So, if they were on a mission together, they could use these combined abilities to get to places faster. For example, if they were chasing a villain who escaped to an island, Elsa could freeze a path across the water and Spider - Man could swing them both along the path at high speed.