It could be an older wizard who has been around for a long time and has seen many changes in the wizarding laws. He might have been a bit of a rebel in his younger days and now uses his knowledge of the legal system to help those in need. Harry comes to him because of his reputation for being fair and his vast experience in dealing with all kinds of legal matters in the wizarding world.
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.
Maybe it's a completely new character. A wizard who has been living in the wizarding world but has always been interested in the Muggle concept of law. He could have traveled to the Muggle world to study law and then come back to the wizarding world to start his own legal practice. Harry hires him because he has a unique perspective on both worlds' laws.
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.
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.
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.
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.
Hermione Granger could be a great candidate. She is extremely intelligent, has a deep understanding of the wizarding laws (from all her studies), and is very determined. She could use her knowledge to fight for justice as a private lawyer. Her Muggle - born background might also give her an edge in dealing with situations that require a different perspective from the traditional wizarding view.
The main character could be Hermione Granger. Since she is very intelligent and has a strong sense of justice, she could easily be re - imagined as a lawyer. She could use her vast knowledge of magic and her quick thinking to bridge the gap between the two worlds and help the Avengers out. For example, if there was a spell that was being misused in the Avengers' world, she could figure out how to stop it legally.
Obviously, Harry would be one of the main characters. He could be a young entrepreneur or a well - known public figure. The head of the security detail could also be a main character. Maybe he's an experienced ex - police officer with a no - nonsense attitude. There could also be a tech - savvy member of the security detail who is in charge of all the high - tech security gadgets. For example, he could be a young genius who developed some of the most advanced surveillance software.
Hermione Granger could be a common character. Given her intelligence and knowledge of the wizarding world laws (she's always reading), she could easily be imagined as a brilliant lawyer. She would use her quick thinking and vast magical knowledge to build strong cases.
I think Dumbledore might be a candidate in the fanfiction. He's the most powerful wizard of his time and could offer Harry deep insights into magic, history, and the fight against the dark side. Also, Luna Lovegood could be a tutor in her own strange but brilliant way. She has an unconventional view of magic that might open new perspectives for Harry. Then there's Sirius Black. He could teach Harry about the wizarding world outside of Hogwarts and some spells and tricks he learned during his time as a fugitive.
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.