Draco Malfoy could be a likely candidate. He already has a sense of superiority and family influence. In fanfiction, he could use his family's wealth and connections in the dark wizarding world to start building a criminal empire. Maybe he gets tired of being in the shadow of Harry Potter and decides to take a more devious path.
One implication is that it can upset the original fan base. Fans have a certain image of Harry Potter, and changing him into a crime lord is a huge deviation. Another is that it could change the way people view the entire Harry Potter universe. If this idea spreads, it might make the world seem darker and more morally ambiguous.
This is a highly controversial concept. The Harry Potter franchise has a huge global following. J.K. Rowling created Harry as a symbol of hope, courage and the fight against evil. Making him a crime lord in fanfiction not only goes against the established character traits but also has the potential to distort the positive impact the series has had on generations. It may be popular among a very small subset of fans who like dark and subversive interpretations, but overall it will likely be met with a great deal of opposition from the larger fan community.
One interesting concept could be how a character from the Harry Potter universe turns into a crime lord. Maybe they use magic in new and dark ways to build their criminal empire, like using the Imperius Curse to control others for illegal activities.
I think his character would likely face moral conflicts and struggle to balance his past with his new role. This could lead to internal turmoil and growth as he tries to find his way out of the criminal life.
A new character could be introduced as a Sith Lord. Maybe a wizard who has been studying dark and forbidden magic from other dimensions. He could have a red lightsaber - like wand and use powers that combine magic and Sith - like abilities. For example, he could use mind control not just on muggles but also on some weak - willed wizards.
Hermione Granger would also be a great candidate. She is highly intelligent like a Ravenclaw, but her loyalty to her friends and the fight against evil shows Hufflepuff traits. Her courage in the face of danger is Gryffindor - like, and she has proven to be cunning when outwitting her enemies, which is a Slytherin quality.
If we consider Naruto as a crime lord in fanfiction, it could be a result of a time - travel or alternate universe scenario. Imagine Naruto seeing the future of the ninja world in ruins because of the actions of the so - called 'good' ninja villages. Disillusioned, he travels back in time and decides to take matters into his own hands, by creating a criminal organization that he believes will prevent the disasters he witnessed. This would completely change the dynamics of the Naruto universe we know, with Naruto being a complex anti - hero rather than the traditional hero.
The plot could start with Naruto being betrayed by the Hidden Leaf Village. This betrayal could push him to the edge and he decides to use his skills against the village. He starts building his own criminal empire, recruiting those who feel wronged by the village system. He could be involved in illegal trading of ninja tools and forbidden jutsus.
Maybe it's a powerful and reclusive wizard who has chosen to make the forest his domain. He has mastered forest - related magics that are unknown to most wizards. He has made a pact with the forest itself, becoming its protector and ruler, and thus is known as the Lord of the Forest.
Harry Potter himself would probably be one of the main characters. He could bring his magical skills and knowledge to Winterfell. Another likely character could be Jon Snow from Winterfell. He could interact with Harry and learn about magic. Hermione might also be there, using her intelligence to solve problems in the new setting of Winterfell.