In some fanfictions with a concept like this, the main plot could revolve around Harry trying to fix something in the past or future that has gone wrong. It could be that the wizarding world is in jeopardy because of a time - related catastrophe, and he has to journey through these wastelands of time to find a solution. For example, perhaps Voldemort has found a way to manipulate time to his advantage, and Harry has to stop him by delving into the mysteries of the wastelands of time.
Another possibility is that the wastelands of time are a place where forgotten or dark magic resides. Harry might be drawn there by a prophecy or a strange occurrence. Once there, he could meet characters from different time periods, both good and bad. He would then have to navigate through this complex world of time, making allies and enemies along the way, all while trying to figure out how to use the unique magic of the wastelands to his benefit or to save the wizarding world.
Obviously, Harry Potter himself would be a very important character. Since it's a fanfiction based on the Harry Potter series, he would likely be the central figure driving the story forward. Hermione and Ron might also be important as they are Harry's closest friends and usually accompany him in his adventures.
I'm not sure about the exact main plot points as there could be many different versions of such a fanfiction. But it might involve Harry dealing with his new identity as a weretiger while still facing the usual threats in the wizarding world, like Voldemort.
The fanfiction might start with Harry being haunted by the fate of the Longbottoms. He realizes that he has a moral obligation to try and help them. As he begins his journey to heal them, he uncovers secrets about the dark magic that was used against the Longbottoms. These secrets could be related to a particular Death Eater or a forgotten branch of dark magic. Along the way, he has to also deal with his own insecurities and doubts, but with the support of his friends, he perseveres until he finally manages to heal the Longbottoms.
One common plot point is Harry's discovery of his new heritage. He might initially be confused or in disbelief about being the son of Apollo. Another is how this new identity affects his relationships, such as his friends being either accepting or skeptical. And often there's a plotline about him having to learn new powers related to his godly father, which he then uses to face challenges in the wizarding world.
One main plot point could be Harry's discovery of his relation to Morgana. This would likely send him on a journey of self - discovery, trying to figure out what it means to be her heir. Another could be how the wizarding world reacts to this revelation. Some might fear him, while others might see him as a potential savior or a powerful ally.
There might be a mentor - like character who has some knowledge about the time anomalies in the 'wastelands of time fanfiction'. This character could guide the main character through the complex web of time - related problems. They could be an old - timer who has seen many of the strange time events occur and has some wisdom to share.
A great plot point might be Arwen's perspective on the concept of magic in the Harry Potter universe compared to that in Middle - earth. Since she has a different understanding of magic, her reactions and interactions with the wizards could be really fascinating. For instance, she might be surprised by some of the more 'brute - force' spells used in the wizarding world, while the wizards might be in awe of her more subtle and nature - based elven magic. Another interesting aspect could be if Arwen gets involved in the fight against Voldemort. Her elven wisdom and powers could potentially change the course of the battle in unexpected ways.
Often, a key plot point is Fem Harry's self - discovery. She realizes she can be more than just a Potter. For example, she might find new magical abilities that the Potters were not known for. Another plot point could be her making new relationships. Since she's not bound by the Potter name, she can form friendships with people who would have otherwise been off - limits due to family feuds or alliances related to the Potters. Also, her forging a new identity in the wizarding world is a big plot point. She might choose a new name or a new area of study that has nothing to do with the Potter family traditions.
Well, it could be about how the wizarding world is adapting to new magical discoveries. Maybe new spells are found that change the way magic is taught at Hogwarts.
One main plot point is the Triwizard Tournament. Harry is mysteriously entered into it. Another is the return of Voldemort. He uses the tournament to come back to power.