How about 'Time - Twisting in Harry Potter's World'? It clearly shows the time - traveling aspect.
One possible fanfiction could be about Harry Potter accidentally stumbling upon a time - turning device in Hogwarts and ending up in the 1940s. There, he might meet the young versions of his professors, like Dumbledore, and get involved in the events that were shaping the wizarding world at that time, such as the rise of Grindelwald.
You could use names like 'The Forbidden Chronicles', 'Potter's Parallel', 'Hogwarts' Hidden Tales'. These names give a sense of mystery and connection to the Harry Potter universe.
Well, some fanfictions use the idea of time being more fluid in the wizarding world. So, a character might be able to travel through time by simply having a strong enough magical will or a connection to a certain magical object. For instance, a character might be able to travel back in time by holding an old family heirloom that has time - traveling properties. This is different from the more regulated Time - Turner concept in the original books. It allows for more flexibility in the plot and the relationships that can be explored. And often, the consequences of messing with time are also explored, like how changing one small thing in the past can have a huge impact on the future.
One interesting concept is changing major events in the wizarding world. For example, a character could go back in time and prevent Voldemort's rise, which would completely change the whole series' story. Another concept is meeting the younger versions of beloved characters like Dumbledore or Snape and influencing their development in ways that are unexpected.
Perhaps Harry gets stuck in 1970 and has to find a way back. In the process, he discovers a long - lost magic that has been forgotten over time. He has to use this new - found magic in combination with his existing knowledge to build a time - travel device or find a magical artifact that can send him back to his own time.
One popular one could be 'Back in Time to Save You' where a character goes back in time to change the fate of a beloved character in the Harry Potter universe. It has an interesting take on how time travel can affect relationships and the overall plot of the wizarding world.
Hermione is a very popular character. Her intelligence and love for knowledge make her a great candidate for time - traveling adventures. She could use her wits to navigate the challenges of different time periods. Harry is also common, as he has a natural inclination towards heroics and could be sent back in time to prevent some of the tragedies that occurred in his life.
Hermione would be a likely companion. She loves learning and exploring, so she'd be eager to go on a traveling adventure with Harry. Ron might also tag along, especially if there's a chance of food and adventure. Neville could be another option. He has grown a lot in courage and his knowledge of plants could come in handy in different magical environments. Luna Lovegood would be a very interesting companion too. Her unique perspective on magic and the world would add a lot of fun and mystery to the journey.
In some fanfictions, time - traveling magic might work through a powerful magical artifact. For example, a special Time - Turner that is more advanced than the one Hermione used. It could have the ability to transport the user to any point in time they desire. Another way could be through a spell that requires a great deal of magical power and concentration. The caster would have to visualize the exact time and place they want to go to.
One great fanfiction could be 'Back to the Beginning' where Harry travels back to his first year and tries to change some small events that he later realizes have big consequences. It has really interesting character interactions and a unique take on how time travel works in the Harry Potter universe.