One idea could be exploring a scenario where Harry's mom, Lily, survives the attack from Voldemort. Maybe she has some hidden magic that she uses to fight back at the last moment. This would completely change Harry's life as he would grow up with his mother's love and guidance.
One possible plot idea could be that Harry discovers a hidden talent that his mom had when he stumbles upon an old diary of hers. Another could be them going on a magical adventure together in a hidden part of the wizarding world.
One idea could be exploring the deeper bond between Harry and his owl, Hedwig. Maybe a story where Hedwig has some secret magical abilities that help Harry in a unique way during a difficult time at Hogwarts.
In a fanfiction about Harry Potter and his parents, a great plot could be that Harry discovers a hidden diary of his mother. Through reading it, he gets to know her deepest thoughts, her fears, and her hopes. He also learns about the early days of the Order of the Phoenix through her eyes. This discovery could change his perspective on his own life and his place in the wizarding world. He might then be inspired to follow in his parents' footsteps more closely, perhaps by joining an organization that his parents were once part of.
One idea could be Harry going on a solo adventure to discover more about his family's past. He could travel to places his parents were known to have visited. Another could be Harry having to face a new dark wizard all by himself without the support of his friends, relying solely on his own skills and the magic he has learned over the years.
A really interesting plot could be that Harry, after the defeat of Voldemort, decides to go undercover in the wizarding underworld to root out any remaining dark wizards. He has to change his appearance and assume a new identity. Along the way, he discovers a conspiracy that is much larger than he expected. He also meets some characters who are on the fence between good and evil and has to decide whether to trust them or not. This would be a very thrilling and different kind of story for Harry.
One idea could be exploring Harry's family vacations. Maybe they go to a magical beach where the kids learn special water - based magic. Another could be a story about Harry teaching his kids about the Marauder's Map and the adventures they have trying to find hidden passages in Hogwarts that even he didn't know about.
One idea could be that Harry discovers he has a sister he never knew about. He then has to protect her from the dark forces in the wizarding world while also teaching her about magic. Maybe they go on a journey to find out more about their family's past together.
Another plot could be that without his glasses, Harry is mistaken for someone else in the wizarding world. This leads to all sorts of comical and at the same time dangerous situations as he tries to figure out who this other person is and why they are important. He might get involved in a mystery that has to do with his doppelganger.
One idea could be that without his glasses, Harry has a hard time recognizing his friends at first. This leads to some comical misunderstandings. For example, he mistakes Ron for a first - year student and tries to give him advice. Another plot could be that his lack of glasses makes him more vulnerable in a duel because he can't see the spells coming clearly. It could add an extra layer of danger and suspense to the story.
Well, in some fanfictions, Harry might change his appearance to blend in with a different magical community. Say, he wants to study the magic of the centaurs, so he changes his appearance to look more like them. He could have a horse - like lower body and a more wild - looking upper body. This would not only help him get closer to the centaurs but also give him a whole new perspective on magic. It could also lead to some interesting interactions with other characters who don't recognize him at first.