It could be a descendant of a rival family to the Peverells. This person might be jealous of the power and secrets that the Peverell family held and wants to stop Harry from uncovering them. They could try to manipulate events to their advantage and create obstacles for Harry.
Perhaps Voldemort could still be the main antagonist, but in a different way. Ignotus Peverell's secrets might be the key to finally defeating Voldemort. So Voldemort would do everything in his power to stop Harry from getting to those secrets. He might send his Death Eaters to interfere with Harry's search for Ignotus Peverell - related things.
Well, in such a fanfiction, Harry Potter might discover some long - lost secrets about the Peverell family. Maybe Ignotus Peverell has some hidden magic or knowledge that could help Harry in his fight against Voldemort. For example, he could find a powerful spell or artifact that was created by Ignotus.
Often, his character is developed by exploring his backstory. Writers might give details about his family, his upbringing, and what led him to create or obtain the Deathly Hallows. This helps to build a more complex and three - dimensional character.
Well, in many fanfictions, Ignotus Peverell can be portrayed as a very mysterious figure. His connection to the Deathly Hallows is often explored in greater depth. For example, some fanfictions might delve into his life before the creation of the Hallows, his relationships with his brothers, and how his actions ultimately led to the legend we know in the original Harry Potter series.
Ignotus Peverell himself can be considered the best character in many of these fanfictions. Since he has such a mysterious past and his connection to the Resurrection Stone, he offers a lot of room for creative storytelling.
One interesting 'Harry Potter Ignotus Peverell' fanfiction could be one where Ignotus Peverell's early life is explored in detail. It might show how he came to possess the Resurrection Stone and his relationship with his brothers. Another could be a fanfic that weaves a story of how Ignotus Peverell's magic influenced the later events in the wizarding world that Harry Potter was a part of.
Perhaps a group of pure - blood supremacists could be the main antagonists. They see the Peverell descendant as a threat to their ideas of a pure - blood - only wizarding world. They might try to undermine the descendant at every turn, spreading false rumors and trying to isolate them from the rest of the wizarding community.
It could still be Voldemort. Even though the focus is on Harry and Nagini, Voldemort is Nagini's master and the main source of evil in the Harry Potter world. He would likely try to stop Harry from getting too close to Nagini or from finding out any secrets Nagini might hold.
It could be a dark wizard who is jealous of the bond between Harry and Lily. This wizard might try to break their connection and use Lily's power for his own evil purposes. Maybe he wants to control Lily's magic, which is known to be strong, to achieve domination over the wizarding world.
It could be Voldemort who somehow follows Harry into the realm of the Morrigan. His dark magic could disrupt the balance there and make him a common enemy for both Harry and the Morrigan.
There could be a group of anti - magic fanatics in the fanfiction. They see Byako as an abomination because of his strange powers that don't conform to the normal rules of wizarding magic. They also view the Hogwarts students' acceptance of Byako as a sign of the corruption of magic. So they set out to eliminate Byako and anyone who stands in their way.