One possible interesting plotline could be how Harry adjusts to his new family. Since the Greengrass family has its own traditions and values, Harry might struggle to fit in at first. For example, he could be unfamiliar with their social circles in the wizarding world. Another plotline could involve how his relationship with the Greengrass sisters develops. Maybe he forms a close bond with one of them and they go on magical adventures together, exploring parts of the wizarding world that were previously unknown to Harry.
In the 'Harry Potter adopted by Greengrass fanfic', an interesting plotline could be the cultural clash. Harry, coming from his own background, has to adapt to the Greengrass family's pure - blood elitist views in some aspects. He might try to change their minds or find a middle ground. And there could be a story about how Harry's presence in the Greengrass family affects their reputation in the wizarding community. Some might view it as a strange adoption, while others might see it as an opportunity for the family to gain more influence.
Another plot could involve Daphne Greengrass being a secret admirer of Harry Potter from afar. As the story progresses, she gradually reveals her feelings and they start to bond over their shared experiences of the wizarding world, like dealing with the expectations of their pure - blood families.
Obviously, Harry Potter is one of the main characters. He is the one being adopted into the Greengrass family. Then, the Greengrass family members are important. There are likely to be the parents of the Greengrass family, and the Greengrass sisters. We might see Astoria Greengrass and her sister (if she has one in the fanfic). These characters will play significant roles in Harry's new life and the development of the story.
Well, he might grow up with a different set of values and magical education. The Greengrass family is known for their pure - blood status. Harry could have a more refined upbringing in terms of pure - blood traditions. He might also have a different relationship with the wizarding world at large, perhaps being more involved with the pure - blood society.
Some fanfictions have a plotline where Daphne Greengrass has a secret power or ability. Harry discovers this during their adventures together. Their love grows as they work together to harness or hide this power from the wrong people. It could also lead to a situation where Daphne becomes a target because of her power, and Harry has to protect her, strengthening their bond.
One possible interesting plotline could be Harry's interactions with the Greengrass family. Maybe he forms an unexpected friendship with Daphne Greengrass and through her, gets involved in the complex politics of the pure - blood families in the wizarding world.
Well, one interesting plot could be how Harry adapts to a different family environment. Growing up with the Greengrass family might expose him to different magical traditions and values compared to the Dursleys. Maybe he learns unique spells or has a different approach to dealing with Hogwarts politics.
One possible plotline could be that Harry's adopted Veela family helps him discover new magical abilities that are unique to their Veela heritage. This could give him an edge in his battles against Voldemort.
Another possible plotline is the relationship between Harry and the goblin community. How do they accept him as one of their own? There could be some goblins who are against the idea of adopting a human, and Harry has to prove himself worthy. This could lead to a lot of internal conflict within the goblin society as well as Harry's own personal growth.
In this 'harry is blood adopted by potter fanfiction', a great plotline could be Harry's struggle to find his identity. He's now part of the Potter family in a more profound way, but he also has his own experiences and personality. There could be a story arc where he tries to blend the two, while also dealing with the fact that his adoption might have been part of some greater plan. Maybe he uncovers a conspiracy behind his adoption, which involves dark wizards or hidden agendas within the wizarding world. This would not only change his view of his family but also his role in the fight against evil.
One interesting plotline could be that Harry is adopted by a powerful wizard family outside of the wizarding world. They introduce him to different magical cultures and techniques that are not common in Hogwarts. This gives Harry a whole new perspective on magic and makes him even more powerful in the long run.