Well, the plot could involve her arriving in Konoha and being mistaken for a strange new ninja. She might use her magic in unexpected ways that both amaze and confuse the Konoha residents. Maybe she teams up with Naruto and his friends to fight against a new threat that is both magical and ninja - related.
Well, he might introduce magic from the wizarding world to the ninjas. For example, he could show them spells like Wingardium Leviosa and they might be amazed at how different it is from their chakra - based jutsu.
The plot could involve Harry finding out that there are magical elements in Konoha that are different from what he knows in Hogwarts. He could be introduced to chakra and start to study it alongside his own magic. Maybe he gets involved in the Chunin Exams, using his magic to compete in a unique way. He might also encounter some dark wizards who have made their way to Konoha, leading to an epic battle to protect the village.
Her magic would probably be seen as something very strange and powerful. The ninja in Konoha are used to chakra - based abilities, so her spells and potions would be completely new to them. Some might be in awe of her magic, while others might be a bit scared, thinking it could be a threat.
One possibility is that Harry, with his magical skills, could introduce a whole new type of magic to Konoha. Maybe he'd help the ninjas with some of their toughest problems using spells like 'Accio' to retrieve lost items during missions. He could also learn about chakra and combine it with his magic in unexpected ways.
The kids in Konoha like Naruto would probably be very excited. They love new and different things, and Harry with his magic would be really cool to them.
Well, perhaps Harry Potter goes to Dalton and discovers a whole new world of magic there. Maybe he meets new friends and has to face different challenges compared to Hogwarts.
In this fanfiction, it could be that Harry Potter has a vision of a future where Voldemort has completely taken over the wizarding world and killed all his loved ones. This drives him into a state of madness and he goes on a rampage. He travels back in time using some ancient magic he discovers, and starts to take out all the Death Eaters one by one, not caring about the consequences, as he believes it's the only way to change the future.
One possibility could be that after facing too many dark magic encounters, Harry's mind starts to break. Maybe the constant threat from Voldemort and the losses he endures, like the death of his friends, push him over the edge. He could start to have hallucinations and lose his ability to distinguish between reality and dark magic-induced illusions.
In a 'Harry Potter goes to jail' fanfiction, perhaps Harry breaks a new law that the Ministry of Magic has created to maintain control. For example, if he tries to teach magic to non - magic people in an attempt to prepare them for a potential dark wizard threat. The Ministry, fearing chaos, throws him in jail. Inside, he meets other wrongly - imprisoned wizards and they plan an escape together while also fighting against the unjust system.
Maybe it's about Harry Potter being framed for using dark magic in a way that violates the wizarding laws. As a result, he has to go to this 'juvie' place. In there, he discovers that there are other kids who have also been wrongly imprisoned. He then uses his skills and the loyalty of his friends (who might try to break him out or help him legally) to fight against the unjust system.