In this fanfiction, Harry could be brought into the Unspeakables to deal with some ancient and powerful magic that has been awakened. He may start off as an outsider among the Unspeakables, but gradually earn their respect. His adventures within the Department of Mysteries could include uncovering long - lost spells and artifacts. This could also lead to a conflict between his loyalty to his old friends and his new responsibilities within the Unspeakables.
One potential antagonist could be an ancient magical entity that has been awakened by the experiments of the Unspeakables. It sees Harry and the Unspeakables as a threat to its existence and tries to destroy them. Additionally, there could be a group of anti - Ministry wizards who believe that the Unspeakables are dabbling in dangerous magic and they target Harry as a symbol of the Unspeakables' activities.
Well, it could be about Harry Potter exploring a new world of magic within the coven. Maybe he discovers new spells or magical abilities that are different from what he learned at Hogwarts. He might also meet new and interesting characters who have their own unique magical practices.
Well, in such a fanfiction, Harry Potter might bring a new perspective to the Hellsing crew. He comes from a world where magic has different rules and ethics. His presence could lead to some internal conflicts within Hellsing as they debate whether to trust his 'alien' magic. Also, Harry might be shocked at the extreme measures Hellsing takes against vampires and other supernatural beings, and try to find a more 'humane' solution while still protecting humanity.
Perhaps Harry joins Voldemort out of a sense of hopelessness. After seeing so much destruction in the wizarding world, he might think that joining Voldemort is the only way to end the war quickly. However, he soon realizes that Voldemort's methods are too extreme and tries to find a way to turn things around from within the dark side.
Well, one possibility is that Harry could use his magic skills in a discreet way to help the BAU team. For example, he could use a spell to make a suspect more talkative during an interrogation. Another could be that his experience with the dark arts and fighting Voldemort gives him an edge in understanding the motives of really evil criminals that the BAU might be hunting. He might also introduce the team to magical creatures that could be used as analogies for certain criminal behaviors.
In this fanfiction scenario, it could be that Voldemort was misunderstood due to a long - standing feud between two powerful wizarding families. The real motives of Voldemort were to bring equality among all wizards, regardless of their blood status. Harry, who has always fought for justice, sees the potential in this 'good' Voldemort and decides to join him. They then start a journey to change the perception of the wizarding society towards Voldemort and his ideas.
Well, one possible plot could be that Harry uses his magic skills in a covert way within the special forces. For example, he could use the Disillusionment Charm to make himself and his team invisible during stealth missions. He might also use his quick thinking, which he developed from all his battles at Hogwarts, to outwit the enemies. His ability to sense danger, much like his connection to Voldemort in the original series, could help the special forces avoid ambushes.
One possible plot could be that Harry Potter uses his magical skills to solve a case that NCIS is stumped on. For example, he could use the spell 'Revelio' to find hidden evidence that normal forensic techniques couldn't detect. His knowledge of the wizarding world might also lead him to suspect that a suspect is using some form of dark magic or enchanted object in their crimes.
Well, one possibility is that Harry is tricked into joining the dark side. Maybe Voldemort uses some dark magic to cloud Harry's mind and make him believe that the dark ways are the right ones. He could start using dark spells and turn against his friends.
Perhaps the story could start with Harry being in a desperate situation. He might think that joining the League of Doom is his only option to gain power to defeat a greater evil. However, once inside, he realizes the true nature of the league and has to fight against his new 'allies' to protect the wizarding world. He could use his knowledge of both the light and the dark magic he's exposed to within the league to his advantage.