One great 'Harry Potter Arcturus Black' fanfiction is 'The Legacy of Arcturus Black'. It delves deep into his family history and how it intertwines with the main events in the Harry Potter universe. The author does an amazing job of character development, making Arcturus a complex and interesting figure.
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 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.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of Harry Potter fanfictions, and you're likely to find quite a few about Arcturus Black there. Just use the search function and type in 'Arcturus Black' in the Harry Potter section.
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.
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.
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.
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.
In fanfic, it could be that Arcturus Black was a part of a secret society or had a mission that was related to the Potter family. He might have made some kind of pact or arrangement that made Harry his heir. It could also be a case of alternate timelines or universes where the normal rules of inheritance don't apply. Maybe in this particular fanfic's world, the magical laws are different and Arcturus Black's connection to Harry as an heir is a new and exciting concept.
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.