Perhaps the phoenix can travel through time as well in this fanfic. Harry travels back in time with the phoenix to a crucial moment in the wizarding world's history. He has to make sure not to disrupt the timeline while also learning something that can help in his present fight against the dark forces.
In the fanfic, the phoenix might be the key to traveling between different magical dimensions. Harry embarks on a journey with the phoenix to various dimensions, each with its own set of rules and magical creatures. He has to adapt quickly and use the knowledge he gains to solve problems in his own world.
One interesting plot idea could be exploring the backstories of the minor characters in the Order more deeply. For example, what made them join the Order and their personal struggles during the fight against Voldemort.
Well, a great plot in harry potter and phoenix fanfiction could be about the Marauders' Map falling into the wrong hands. This could lead to a whole new set of adventures and dangers for Harry and his friends. Also, fanfiction could explore the backstories of some of the minor characters in the Order of the Phoenix. What if one of them had a hidden connection to Voldemort's past? It would add a new layer of mystery and intrigue to the story.
Well, in a time travel fanfic, perhaps Harry accidentally travels back to the time when the founders of Hogwarts were still alive. He might learn ancient magic directly from them and use that knowledge to defeat Voldemort in his own time. Or Ron could go back in time and end up changing some Quidditch matches in the past, which then has unexpected consequences for the present, like different teams winning championships and changing the overall Quidditch culture at Hogwarts.
Perhaps he could use his phoenix form to travel to places that are otherwise inaccessible. He could fly to the Forbidden Forest's most secret corners and discover new magical creatures or ancient magic. Also, his rebirth as a phoenix might give him the power to communicate with other phoenixes, and they could pass on their ancient wisdom to him.
In some fanfictions, a plot idea is to have Harry gain a new power. In the context of 'Harry Potter Order of the Phoenix', it could be a power related to his connection with the late Sirius Black. For instance, he might be able to communicate with Sirius in a new way, like through dreams more vividly. This could change the way he approaches his fight against Voldemort and the Death Eaters. Also, a plot could involve the Ministry of Magic having a more complex internal struggle that affects the Order's operations.
In a fanfiction, the Phoenix and the Basilisk could be two parts of an ancient prophecy. Harry Potter is the one foretold to either unite them or destroy one to save the other. Along the way, he has to learn about the true nature of both creatures. He might find that the Basilisk isn't as purely evil as it seems and the Phoenix has a more complex role than just being a symbol of good. This could lead to a very engaging story full of moral dilemmas and exciting magical encounters.
A plot could be where the Phoenix wand is stolen and Harry has to go on a quest to get it back. He might have to face dark wizards who want to use the power of the phoenix feather for evil. Along the way, he discovers more about the true nature of his wand and the connection it has to the wizarding world as a whole.
In a 'Harry Potter Dark Time Travel Fanfic', a character could travel back to the time of the first great wizarding war. They could attempt to save lives that were lost in that conflict, but in doing so, they unknowingly create new threats. For instance, saving a certain wizard might lead to that wizard being corrupted later and causing even more destruction.
Another idea is that Harry travels to a time when his family was being hunted by Voldemort but in a parallel timeline. He could try to find a way to merge the timelines in a way that saves his family in both timelines. This would involve a lot of complex magic and decision - making on Harry's part.
Perhaps a fanfic where Lily Potter's spirit is able to communicate with Harry Potter during his difficult times at Hogwarts. She gives him advice and guidance that helps him through his struggles, like dealing with Snape's complex feelings towards him, or facing the challenges of the Triwizard Tournament. This would add an emotional and magical element to Harry's journey.