There could be an older wizard or witch who has no children of their own. They see Harry as a chance to pass on their knowledge and wisdom. They might be a bit of an outcast in the wizarding community but have a lot to offer Harry in terms of magical education and life experience.
Well, one plot could be that Harry is adopted by a family outside of the wizarding world. He grows up with no knowledge of magic until strange things start to happen around him. Then he discovers his true heritage.
There were many novels that involved the adoption of ghost babies. Among them, the more famous novels were Ghost Blows Out the Light and Grave Robber's Chronicles. In these novels, the protagonist would usually adopt a ghost baby and gradually understand the identity and purpose of the ghost baby through communication and getting along with it. Finally, he would solve the trouble and threat brought by the ghost baby. The novels about ghost babies often involved the discussion of human nature and the construction of worldviews, which made the readers resonate and think.
Perhaps the villain adopts Izuku out of a sense of pity at first. But then, realizing Izuku's quirk could be useful, he starts to use Izuku for his own gain. The story could involve Izuku being sent on dangerous missions by the villain. Izuku, being young and naive, initially obeys. But as he witnesses the harm his actions cause, he begins to resist. This could lead to a conflict between Izuku and the villain, with Izuku trying to find his true identity and purpose outside of the villain's control.
You can try searching on fanfiction websites like Archive of Our Own or FanFiction.net. They have a large collection of fan - created stories, and you might be able to find some 'baby bella adopted fanfiction' there by using the search bar and typing in the relevant keywords.
One great 'baby bella adopted fanfiction' story could be where Bella is adopted by a family of vampires who teach her their ways in a very different way from the original Twilight story. It could focus on her growing up with them and the unique bond she forms.
One interesting fanfiction could be about baby Harry's first magical experiences even before he went to Hogwarts. Maybe he unknowingly made his toys levitate when he was really young, and his aunt Petunia was terrified but couldn't figure out what was really going on.
Ron could also be there. He might be a bit jealous at first if Harry's adopted family is wealthier or has more influence in the wizarding world. But later, he would support Harry as always.
One common theme is family. Since Harry is being adopted, the new family dynamics, love, and acceptance are often explored. For example, how he forms bonds with his new family members.
One great fanfiction could be 'The New Beginning' where fem Harry's life takes a magical turn after being adopted by Zatanna. It explores how Harry discovers her new powers and her relationship with Zatanna.