One possible plot could be that the lawyer helps Harry deal with the legal aftermath of the Battle of Hogwarts. There might be issues regarding the rebuilding of the wizarding world, and the lawyer could ensure that Harry's rights and the rights of his friends are protected during this process.
In a 'Harry Potter has a lawyer' fanfiction, the plot could be centered around a new threat to the wizarding world that is more legal in nature. For example, a group of dark wizards could be using loopholes in the wizarding laws to gain power. Harry, with the help of the lawyer, has to study and understand these laws to stop the threat. The lawyer could also have a backstory of their own, perhaps being from a family of Muggle - born wizards who have always been interested in making the wizarding legal system more just for all. As the story progresses, Harry and the lawyer form a strong bond while facing various challenges both in the courtroom (if there is such a thing in the wizarding world) and in the field against the dark wizards.
Well, the plot could involve the wizarding world having a complex legal system that Harry doesn't fully understand. A lawyer comes into his life to help him with the inheritance he received from his parents, which has been tied up in legal red tape due to the actions of Voldemort. The lawyer also has to navigate the political and social implications of dealing with Harry Potter, as he is a very famous figure in the wizarding world.
Well, perhaps Harry Potter, in the guise of Loki, uses his trickery skills in the wizarding legal system. He could be defending those wrongly accused of using dark magic, like using his shape - shifting abilities to find evidence that others can't.
One possibility could be that Harry Potter hires a lawyer to deal with the legal mess left behind by the wizarding wars. For example, he might need help in getting proper compensation for the damages done to the wizarding community. The lawyer could be a Muggle - born wizard who has knowledge of both worlds' legal systems and uses that to fight for the rights of those affected.
One possible plot could be that Harry discovers some corrupt practices within the wizarding legal system. As a lawyer, he decides to take on the powerful figures involved. He uses his knowledge of the Dark Arts and the laws of the wizarding world to build his cases. Along the way, he meets new characters, some of whom are trying to stop him while others are eager to help. His Gryffindor courage drives him forward, and he has to balance his personal life, including his relationship with Ginny, with his fight for justice in the legal realm.
The plot could involve a situation where Harry Potter hires a goblin lawyer to fight against the unfair treatment of house - elves in the wizarding world. He might want to use legal means to change the laws regarding their servitude. Since goblins have their own ideas about fairness and legality, the goblin lawyer could be crucial in formulating a legal strategy for this noble cause.
It could be Hermione. She's always been very book - smart and she could have decided to study law in the wizarding world. She already has a great understanding of the rules and regulations at Hogwarts, so it would be a natural progression for her to become a lawyer. And she would be very dedicated to helping Harry with any legal issues.
Luna Lovegood might be an unexpected but interesting choice. She has a unique perspective on the wizarding world. While she may seem a bit eccentric, her ability to think outside the box could be useful in a courtroom. She could come up with creative defenses for Harry, and her calm and dreamy nature might be able to sway a jury or judge in Harry's favor.
There could be an entirely new goblin character created just for this fanfiction. This goblin lawyer could be an outcast from the goblin community because of his more progressive views on wizard - goblin relations. Harry, seeing his potential, hires him to help with his legal battles that require a fresh perspective.
Maybe Harry is at a Quidditch match. He's flying high in the air on his broomstick, but suddenly he feels the urge to pee. He can't just fly down to the loo in the middle of the game. His teammates notice his distracted state and wonder what's wrong with him. It could lead to some interesting interactions among the Gryffindor team members as they try to figure out what's up with Harry while still playing the game.
Perhaps the plot could be that the child of Harry Potter gets sent back in time accidentally. There, they meet a young Harry and his friends. The child has to be very careful not to disrupt the past too much while also trying to find a way back to their own time. This would be filled with lots of tricky situations, like when they almost reveal future events or when they have to avoid being seen by their own young parents.
In a Harry Potter has a son fanfiction, the plot could involve the son inheriting his father's magical abilities and facing new threats at Hogwarts. Maybe he discovers a hidden chamber that holds a powerful and dangerous magic. He might also have to deal with the pressure of being Harry Potter's son, with everyone having high expectations of him.