One possible plotline could be Naruto having to adapt his fighting style. Since he can't hear, he might rely more on his visual senses and his chakra sensing ability. For example, he could learn to read his opponents' lips during battles to anticipate their moves.
Well, one possible plotline could be Naruto having to deal with newfound powers that come with this strange state while trying to keep it a secret from his friends. Another could be how his relationships, like with Sakura or Sasuke, are affected as they notice his different behavior.
One interesting plotline could be Naruto's struggle to adapt to the strict and secretive ways of the ANBU. He's so used to his more open and brash style, so it's a big change. For example, he might have trouble with the stealth aspect at first.
Another plotline could be Naruto influencing the relationships between characters. He could try to bring Sasuke back to the village much earlier in the timeline, preventing a lot of the pain and conflict that occurred between them. Or he could help his parents, Minato and Kushina, in ways that would change the future of the entire Hidden Leaf village.
One interesting plotline could be Naruto struggling to control his newfound emotions during puberty while also dealing with his ninja training. For example, he might find it harder to focus on his jutsu practice because he's constantly distracted by his changing feelings.
One interesting plotline could be Naruto using his future knowledge to prevent certain tragedies. For example, he might stop the death of his parents. He could also use his knowledge of jutsu to quickly become a much stronger ninja at a younger age and change the power dynamics in the village.
A plotline could involve the fem naruto forming a special bond with a character who helps her communicate better. For example, someone who knows sign language or has a telepathic ability. This character could act as her interpreter and friend. Also, there could be a plot where she discovers a hidden power within herself that is related to her deafness, like being able to sense the emotions of others through their chakra in a more profound way because she has to rely on other senses more.
One interesting plotline could be Harry using his modern magic knowledge in Camelot. For example, he might introduce some simple spells that could be useful for daily life in Camelot like a spell for lighting fires easily. Another could be his interactions with the knights of the Round Table. He might learn their code of chivalry and in turn teach them about loyalty in a different way from his own experiences at Hogwarts.
One interesting plotline could be that Harry's 'going crazy' is due to a powerful dark magic spell that was secretly cast on him. He starts seeing strange visions and having out - of - control magic surges.
One possible plotline could be Harry adjusting to the unique supernatural environment in Sunnydale. He might encounter vampires and other demons that are different from what he's used to in the Harry Potter world. Maybe he forms an unlikely alliance with Buffy and her gang to fight a common, powerful enemy.
One interesting plotline could be Harry making new friends at Stonewall who have different magical abilities than those he knew at Hogwarts. This could lead to new adventures and challenges.