I think Sirius Black can be quite interesting in these fics. In a world without Harry, Sirius might have a different path. If he becomes an assassin, his loyalty and his wild nature would be put to a different use. He could be fighting against the corrupt Ministry of Magic or other dark forces in a more direct and violent way than in the original story.
Bellatrix Lestrange can be a significant character in these fanfictions. Since Harry is on a darker path, she might see him as a potential recruit or someone she can manipulate. Sirius Black may also be present, but his role could be one of trying to save Harry from his dark descent, which adds a lot of conflict to the story.
One popular 'Harry Potter WBWL Assassin Fanfiction' story could be 'The Assassin's Path in a World Without Harry'. In this fic, the alternate universe where Harry wasn't born leads to a very different Hogwarts. The main character, who becomes an assassin, has to navigate a world filled with dark wizards ruling unchecked. Another good one might be 'Assassin's Rise in a Potterless World' where the power dynamics are completely shifted and the assassin character has to fight against new forms of evil that have emerged without Harry to balance the scales.
Obviously, Harry Potter is one of the main characters. And the Malfoy family members, like Lucius, Narcissa, and Draco Malfoy are also main characters as Harry is raised by them.
One of the most interesting characters can be the shifter protagonist themselves. They bring a new dynamic to the story. For example, a shifter who can turn into a phoenix might have the power of rebirth and be a symbol of hope. Another interesting character could be a wizard who befriends the shifter and helps them navigate the wizarding world, like a young Hermione - type character using her intelligence to understand the shifters' unique situation.
In many 'harry potter ma fanfiction', Luna Lovegood remains a very interesting character. Her unique perspective and rather odd yet endearing personality make her a great focus. She often gets involved in adventures that showcase her wisdom and bravery in ways the original series only hinted at. Another interesting one is Sirius Black. Fanfiction can explore more of his life before Azkaban and his relationships with other characters like James Potter more deeply. And of course, the Marauders as a group are always fascinating in fanfiction, with their pranks and close - knit friendship being expanded upon.
Snape is an extremely interesting secondary character for fanfiction. His double - agent role and his complex feelings towards Lily Potter can be explored from different angles. There are fanfictions that focus on his early years at Hogwarts, his relationship with the Marauders, and how all of that shaped him into the man he became. Another character is Cho Chang. Her relationship with Harry can be re - examined and extended in fanfiction, and she can also be given more depth and backstory outside of just her romantic connection to Harry.
Well, obviously Harry and Lily themselves are very interesting. Harry because we get to see a different side of him when interacting with his mother. Lily is interesting as we can learn more about her personality and her life before Harry was born. Then there's James Potter. In fanfiction, we might see more of his relationship with Lily and how he influenced Harry even from the afterlife. And Snape, his complex relationship with Lily can be further explored in the context of these fanfictions.
The most interesting part is the blend of two very different worlds. The magic of Harry Potter and the stealthy, action - packed Assassin Creed universe make for a unique combination. For example, seeing a wizard use assassin - like parkour to move around Hogwarts is really cool.
There's a character in some fanfictions called Lyra, a half - veela who has the power to control emotions. She becomes Harry's love interest and her powers often come in handy during battles. Another interesting one is Orion, a powerful wizard who was once a student at Hogwarts but was banished for trying to expose a dark secret within the school. He returns to help Harry in his fight against Voldemort.
Perhaps an international wizard who has been trained in both magic and martial arts in some far - flung magical school. This wizard - assassin has his own code of ethics and when he meets Harry, he decides to take him under his wing, believing that Harry can be a force for good in a different way than the traditional Hogwarts - trained wizards.