In the 'harry goes to death city fanfiction', it could be that Harry is transported to Death City by some magical accident. Once there, he has to adapt to the new and strange environment. He could make friends with the inhabitants who teach him about their unique way of life and combat, which in turn helps him in his own battles against his old foes from his world.
Well, it could be about Death taking on a form that can attend Hogwarts with Harry. Maybe it's there to protect him in a more direct way than the usual magical means. It might interact with Harry's friends, causing some confusion and also some revelations about the nature of life and death in the wizarding world.
He could meet the main characters from Death City. For example, Maka Albarn and Soul Eater Evans. They could be initially cautious around Harry but then become friends as they realize his good intentions.
Maybe Harry goes to Canada to study magic in a hidden Canadian wizarding school. He could meet new friends and learn about different magical creatures native to Canada, like the Thunderbird.
In this fanfiction, perhaps Harry is sent to Beauxbatons as part of an exchange program. At Beauxbatons, he might face some challenges due to the different culture and magic styles. He could also get involved in a mystery related to the school's history, for example, an ancient spell hidden in the school that only he can solve with his unique perspective from Hogwarts.
The plot could involve Harry going to Harlem in search of something specific, perhaps a magical artifact if we're adding a bit of magic to the fanfic. Along the way, he meets interesting characters who help or hinder his search. He could also experience the different food and art in Harlem, which changes his perspective on life.
Hermione would definitely be one of the main characters. She would be very curious about Death's presence at school. She might try to research about it in the library, and her inquisitive nature would lead to some interesting interactions with Death. For example, she could ask Death about the secrets of the afterlife or some ancient spells related to death magic.
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 possible plot could be Harry struggling to adapt to the strict discipline of military school at first. He might have conflicts with the drill sergeants who are tough on him. But as time goes by, he discovers his own inner strength and leadership skills, and eventually earns the respect of his peers and instructors.
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.