In the fanfiction, Arcturus Black is likely an important figure in the wizarding world. He might be a powerful and knowledgeable wizard from the Black family. Maybe he has a long - standing reputation for his magical abilities and wisdom, which is why he is chosen to train Harry Potter.
Arcturus Black might be portrayed as a wizard with a deep understanding of ancient magic in the fanfiction. He saves Harry Potter perhaps because he sees in Harry the potential to defeat the dark forces that are plaguing the wizarding world. His character could be a blend of mystery, power, and a sense of moral obligation towards Harry.
In some Harry Potter fanfiction, Arcturus Black might help by using his family's influence. For example, the Black family has a long history and certain political power within the wizarding world. He could use this to protect Harry Potter from some of the more dangerous pure - blood supremacist groups. He may also offer Harry guidance on the complex politics and social hierarchies of the wizarding world, drawing on his own experiences as a member of an old and influential family.
A major theme is the uncovering of secrets. In many of these fanfictions, Arcturus Black holds some sort of secret knowledge related to the wizarding world, perhaps something about the Dark Arts or the history of Hogwarts. Harry, being the curious and brave character he is, is drawn into this web of secrets. And also, friendship is a theme. Despite the age and family differences, a bond of friendship or a deeper connection forms between them.
One possibility could be that Arcturus Black imparts unique magical skills to Harry Potter. Maybe he teaches Harry some ancient and powerful spells that are not commonly known at Hogwarts. This could give Harry an edge in his battles against Voldemort and his Death Eaters.
One possible plot could be that Harry discovers a long - hidden connection between his family and Arcturus Black. Maybe Arcturus has some secret knowledge about Harry's parents or his destiny. They could team up to fight against a new dark force emerging in the wizarding world, with Arcturus using his old - fashioned but powerful magic and Harry his more modern skills learned at Hogwarts.
Well, one possibility could be that Arcturus Black uses his powerful magic skills to rescue Harry from a dangerous situation. Maybe Harry is trapped in a dark wizard's lair, and Arcturus arrives just in time to fend off the bad guys with his advanced spells.
He might be a character who was involved in the politics of the wizarding world. Fanfiction could explore how his influence, either positive or negative, affected the balance of power. And this could in turn impact the events that Harry has to face. For example, if Arcturus Black had made certain alliances, it could change the dynamics of the war against Voldemort.
There might be a fanfiction where Arcturus Black has a connection to Harry Potter that was previously unknown. For example, he could have left behind a hidden message or a magical object that Harry discovers and which plays a crucial role in his fight against Voldemort. This could add an exciting new layer to the Harry Potter story.
Well, 'Harry Potter and the Hidden Black' is also a good one. This fanfiction focuses on Arcturus Black having a hidden connection with Harry that is slowly uncovered as the story progresses. It weaves in elements of mystery and magic, and the character development of both Harry and Arcturus is quite well - done.