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 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.
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 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.
Elsa's powers are often associated with her emotions and her need to protect her kingdom. Jack's powers are more about bringing joy and a sense of wonder. In the baby's upbringing, Elsa's influence could make the baby more aware of the consequences of its powers and how to use them to safeguard its home. Jack's influence would be more about exploration and using the powers to make others happy. The baby might grow up learning from Elsa how to contain its powers when it's angry or scared, and from Jack how to spread joy during the cold winter months. It could also have a bit of a struggle as it tries to please both parents, but ultimately it would find its own way to combine their teachings and use its powers in a way that is true to itself.
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.
Well, one possibility is that he could be taken in by a kind family. They might not know who he really is and just think he's an ordinary baby. They would care for him, feed him warm milk, and keep him cozy in a little crib. As he grows up, he might start to show signs of his magical powers, like making little ice crystals form on his crib railing when he's excited or sad.
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.
One idea could be that Jack Frost turns into a human to experience the warmth of human emotions. He might find himself in a small town during winter. As a human, he discovers the joy of a hot drink on a cold day, something he never truly understood as a spirit. He could also fall in love with a local girl who is kind - hearted and loves the winter. This newfound love makes him question whether he wants to return to his former state or stay human forever.
Jack's personality would likely become more innocent and naive. As a baby pooka, he might be more curious about the world around him without the usual wariness he has as his normal self. He could be more easily frightened by things that he wouldn't normally be afraid of as an older Jack. Also, he might be more impulsive in his actions, just going for things that catch his eye without thinking much about the consequences.