Power is a common theme. Harry, as a mafia boss, is often depicted as seeking and wielding power in different ways compared to the original series. Another theme is loyalty, as in the mafia world, loyalty to the boss and the group is crucial.
A major theme is the struggle between good and evil in a new context. Harry was originally the hero against Voldemort's evil. But as a mafia boss, the lines between good and bad can get blurred. He may use methods that are morally ambiguous to achieve his goals. There's also the theme of protection. Harry might be building his mafia - like empire to protect the wizarding world in his own way, or to protect certain individuals or groups within it.
One of the themes is the transformation of relationships. For example, his relationships with Ron and Hermione might change significantly. In these fanfics, they may have to adapt to Harry's new role as a mafia boss. Also, there's often the theme of secrecy. Just like in the real mafia, there are secrets to be kept, and this adds an extra layer of mystery to the story. The idea of the 'underworld' of the wizarding world is also a common theme, exploring the parts of the wizarding society that are hidden and not so noble.
Common themes include conflict. There will be conflict between the values of the mafia, like violence and control, and the values of the wizarding world such as justice and equality. Redemption can also be a theme, where perhaps the mafia boss has a chance to change his ways in the magical context. Additionally, there is often the theme of discovery, like the mafia boss discovering the existence of magic or a wizard finding out about the mafia underworld.
Power struggle is a common theme. Naruto, as the mafia boss, often has to fight for control against other powerful groups. Another theme is loyalty. His friends and followers' loyalty is tested in this new, more dangerous world.
Another theme is secrecy. Harry usually has to keep her double life as a mafia boss and a wizard (if it's set in the HP universe) a secret. So, there's a lot of sneaking around and hiding her true identity from different parties.
Romance is also very prevalent. It usually involves a relationship between Harry and another character, which could be a love - hate relationship or a pure love story set against the backdrop of the dangerous mafia world. The contrast between the harsh mafia environment and the softness of love makes it interesting.
Power struggles are a common theme. Just like in real mafia stories, in 'Harry Potter mafia family fanfiction', families or groups fight for control over certain areas of the wizarding world, be it magical resources or influence. Another theme is secrecy. These mafia - like families often have many secrets that they are desperate to keep hidden from the rest of the wizarding community.
Well, identity crisis is a frequent theme. Harry is not just a wizard but also a mafia heir, so he has to figure out who he really is. Another is the idea of justice. In the mafia world, justice might be different from what it is in the wizarding world. So he has to decide which form of justice he will uphold. Also, there is the theme of love and sacrifice. His relationships might be tested as he tries to protect those he loves in both the mafia and wizarding worlds.
One common plot could be power struggles. Harry Potter, as the mafia boss, might be constantly fighting other powerful wizards or groups who want to take over his 'territory' in the wizarding underworld. Another plot could be about revenge. Maybe someone from his past in the wizarding world wronged him, and now he's using his mafia - like power to get back at them.
Redemption can also be a theme. Maybe the mafia boss has a dark past, and the baby boy's innocence or love can be a catalyst for him to change or seek redemption. For example, the baby boy might make the mafia boss want to leave his criminal life behind. It's often about how two very different characters interact and influence each other. Well, in this type of fanfic, the contrast between the hardened mafia boss and the more innocent baby boy is what makes it interesting. The stories can also explore themes of loyalty, as the mafia world is often all about loyalty, and the baby boy might have to navigate that aspect while being in a relationship with the mafia boss.
The theme of power dynamics is also prevalent. The mafia boss has a lot of power in his criminal underworld, while Reid has his own power in terms of his intelligence. The fanfics often explore how these power dynamics play out in their relationship, whether it's a struggle for control or a mutual respect for each other's power.
One could imagine that a distant relative of the Black family, who has been disgraced or cast out, becomes a mafia boss. They still have some of the Black family's wealth and dark magic knowledge, but use it in a more criminal way. For example, they could be running a protection racket in Knockturn Alley, threatening shop owners to pay up or face dark magic. Severus Snape also could potentially be a mafia boss in an alternate story. He has the intelligence and the ability to be secretive. He could be using his potions expertise to create and sell illegal or dangerous potions on the black market, while also maintaining a network of spies and henchmen within Hogwarts and the wizarding world.