Perhaps there's a plot where Harry has a vision of a future where the Order causes great harm. This vision is planted by an enemy of the Order. As a result, Harry decides to take pre - emptive action against the Order. He gathers his own group of allies who believe in his cause and they engage in a series of battles against the Order, with many twists and turns as the truth slowly unfolds.
One interesting plotline could be Harry leading a secret resistance against Umbridge within Hogwarts. He might use his skills in the DA (Dumbledore's Army) to outwit her at every turn. For example, they could use magic in clever ways to undermine her rules without getting caught.
Another possibility is that an overzealous member of the Order who has gone too far in their methods of fighting Voldemort. Their extreme actions might make Harry think they have become as bad as the Death Eaters, so he starts to oppose them. For example, if this member starts using unethical spells on innocent people in the name of the greater good.
One interesting plotline could be that Harry discovers a new, powerful magic that gives him an edge in the fight against Voldemort. For example, he might find a way to combine different spells in an unexpected way. Another could be that Voldemort has a secret weakness that Harry uncovers through his friendships. Maybe one of his friends has a unique connection to an ancient magic that can be used against Voldemort.
One possible plotline could be Harry using his newly discovered magical abilities in unexpected ways against the Dursleys. For example, he might make the Dursleys' dinner plates fly around when they are being particularly mean to him.
Perhaps a plotline where the secret order discovers a hidden prophecy related to Harry that changes their whole strategy for protecting him. They then have to race against time to figure out how to use this new information to their advantage.
Another plotline could involve Harry's relationships within the Order. He has to deal with different personalities and egos. There could be conflicts and reconciliations as he tries to keep everyone united towards the common goal of defeating Voldemort. He might have to make tough decisions regarding who to trust and who not to.
One possible reason could be the Ministry's corruption. In the original series, the Ministry often showed signs of being influenced by dark forces or being overly bureaucratic and not seeing the real threats. So in the fanfiction, this might be a driving factor for Harry to oppose them.
One possible plotline could be that Naruto discovers some underhanded schemes the council has been planning against him. Maybe they are trying to limit his growth as a ninja because they fear his power. So, Naruto decides to fight back by gathering evidence of their wrongdoings and presenting it to the village elders who are not part of the corrupt council. This would be a way for him to expose them and regain the trust and freedom he deserves.
Well, some might involve magical creatures with furry characteristics in new adventures at Hogwarts. For example, a werewolf character could have a unique story arc that intersects with the main Harry Potter plot. Maybe they are trying to find a cure or dealing with the prejudice within the wizarding world in a different way than what's in the original books.
One possible plotline could be a comical take on baby Harry's magical mishaps. Maybe he accidentally makes his diapers levitate or turns his crib into a mini Hogwarts. Another could be about how the other characters like Hagrid or Dumbledore interact with baby Harry in this unique situation, perhaps trying to figure out how to handle his early magical outbursts while he's still in diapers.