One possible plot is that Harry, after the defeat of Voldemort, is looking for a new purpose. When he hears about threats to the queen, he decides to offer his services. He first has to convince the royal family and the normal guards that his magic can be an asset. He then starts to raise a special guard unit of wizards and witches. They would have to learn to work with the muggle security systems. Harry would teach them spells for protection, detection, and emergency response. Along the way, they might face challenges from within the wizarding world who think they shouldn't interfere with muggle royalty, but Harry would be determined to keep the queen safe.
Dumbledore could make an appearance, even if it's in a memory or as a guiding spirit. His wisdom would be invaluable in setting up the guard. McGonagall too could be involved, she could help with training the new guard members in discipline and magical skills. Then there are the Weasley twins. Their creativity with magic could be used to create some unique security measures. They might come up with enchanted objects that can detect and repel any intruders. And Hagrid could also be part of it, his strength and his love for all creatures could be an asset, perhaps he could use some of his magical creatures to keep an eye out for danger.
It could be really interesting. Maybe Harry would grow up with a sense of royal propriety and discipline. He might learn different kinds of magic that are more in line with the grandeur associated with the Queen. Also, his relationship with other characters like Hermione and Ron could be affected as he has this very different upbringing. He could have access to resources and knowledge that normal wizards don't, which would make him a very unique wizard in the wizarding world.
One possible plot could be that Harry grows up learning archery and survival skills from Oliver. He might use his magic in a more covert way in Star City. Maybe he'd even join Oliver in his fight against crime, using a combination of magic and his newfound combat skills.
Since I'm not familiar with this specific 'queen of the crunk harry potter fanfic', it could be a character that the author has made up to be the central figure. Maybe she's a witch who has a very different approach to magic compared to the characters in the original Harry Potter series. She might be the one who brings the 'crunk' element into the story, like having a very wild and unorthodox style of using magic.
The story could be really interesting. Maybe the female Harry Potter would have a different set of friends. Instead of Ron and Hermione, she might befriend children from noble wizarding families. Her magical education could also be different. The Queen might ensure she has the best tutors, not just from Hogwarts but from all over the wizarding world. This could lead to her having a broader knowledge of magic and different magical cultures, which would be really exciting to explore in the fanfiction.
One challenge could be controlling the assassin's violent tendencies. Since the person is being groomed to be an assassin, it's likely they have a natural inclination towards violence, and Harry has to find a way to temper that while also teaching self - defense.
No. The idea of Harry Potter being involved in such a situation goes against the values of the original series. The Harry Potter series is mainly about magic, friendship, and fighting against evil. This kind of fanfic concept not only distorts the characters but also involves inappropriate and unethical content.
Most likely very negatively. The Harry Potter fan community values the positive aspects of the series. They would see this fanfic as a disrespect to the original work and its characters.
He'd be more disciplined. His character would be shaped by military values. He'd be less likely to act impulsively and more likely to think things through strategically.