Perhaps a plotline where Harry's abandonment by Gryffindor makes him more vulnerable to the influence of dark forces. He could be targeted by Death Eaters or other dark wizards who see his isolation as an opportunity. However, this could also lead to him finding new inner strength and ultimately proving that he doesn't need Gryffindor's approval to be a great wizard.
Another scenario could be that an impostor, using some form of shape - shifting magic, disguises as a Gryffindor and does things that make it seem like Harry has betrayed the house first. As a result, the real Gryffindors, deceived by this false appearance, turn their backs on Harry.
One possible plotline could be Naruto growing up on his own, learning survival skills at a very young age. He might become more cynical towards the idea of family. Another could be that he meets someone who becomes like a surrogate family, and through this relationship, he starts to heal his inner wounds. He could also start to search for the reasons why his family abandoned him, leading to a journey of self - discovery.
Perhaps Naruto, after being abandoned by Minato, falls in with a group of outcasts. Together they form a sort of family of their own. Naruto's natural leadership and kind heart start to shine through as he tries to protect this new family. As he uncovers more about his past and Minato, he has to decide whether to forgive his father or hold on to his anger. This internal struggle could be a major part of the fanfiction.
One possible plotline could be Harry feeling extremely depressed at first. He might isolate himself even more, spending long hours in the library or wandering the Forbidden Forest alone. Another plotline could involve him finding new, unexpected allies who help him grow stronger and more independent. For example, he could befriend some of the house - elves who have their own unique magic and knowledge.
One possible storyline could be that some over - competitive Gryffindors bully Harry because they feel he gets too much attention. They might spread false rumors about him, like saying he cheats in Quidditch using magic. Another could be that they envy his connection to Dumbledore and try to isolate him within the Gryffindor common room.
One possible plotline could be Naruto discovers he has a dragon connection that his family feared, leading to his abandonment. As he grows, he befriends the dragon and together they seek revenge on those who wronged him. Another could be that the dragon is a guardian his family didn't understand, and Naruto has to learn to control the dragon's power to prove his worth and find his place in the world. Or perhaps the dragon was the cause of a family curse, and Naruto has to break the curse to reunite with his family.
One possible plotline could be Naruto growing up with a sense of deep abandonment and having to face the world alone. This could lead to him having a much more cynical view of life. He might struggle more with controlling the Kyuubi's power as he has no guidance from Kushina. Another aspect could be his relationships with other characters like Iruka or Sasuke being different. Without Kushina's love, he may be more desperate for any form of connection.
One possible plotline could be Naruto feeling extremely lost and having to find his own way to become stronger without their guidance. He might start to question his own worth and abilities, but then he could meet new allies who help him realize his true potential on his own. For example, he could encounter some other outcast ninja who have their own unique skills and together they form a new kind of ninja team that challenges the traditional ways of the ninja world.
One possible plotline could be that Naruto's family is in a difficult situation and they believe they can only support his sister. So, Naruto is left on his own. He then has to struggle to survive in the ninja world without the support of his family. He might become more independent and self - reliant, forging his own path.
One interesting plotline could be Harry discovering ancient Gryffindor secrets. For example, he might find a hidden chamber within the Gryffindor common room that holds powerful magic only accessible to the true heir. Another could be his interactions with the Gryffindor ghosts in a more profound way, where they guide him to understand his new role as the heir.