There could be many 'Harry Potter is a fighter back in time' fanfics out there. You could also join some Harry Potter fan communities on social media platforms like Reddit or Facebook. The members there are often very knowledgeable about different fanfics and might be able to point you in the right direction. Another option is to use Google and type in the exact title or a close variation of it, along with 'Harry Potter fanfic' to see if it shows up.
One possible plot could be that Harry is sent back in time by some powerful magic or a time - turning device. Once in the past, he realizes that he has a mission to become a fighter for a cause that was lost in the future. He might start by training himself in the older, perhaps more dangerous forms of magic that were forgotten in his time. He then begins to form alliances with wizards and witches from the past who can help him in his fight. This could involve battles against dark wizards other than Voldemort, or even against the Ministry of Magic if they were corrupt at that time. The story could also explore how his actions in the past start to reshape the future he came from in unexpected ways.
Harry Potter himself could be a great sword fighter in fanfiction. He has shown great courage and quick reflexes throughout the series, which would translate well into sword fighting. He also has a connection to the Sword of Gryffindor, which could give him an edge.
One popular theme is time -turner related plots. Since the concept of time -turning exists in the original Potter universe, many 'Back again' fanfics play with the idea of characters going back in time to change things. Another theme is redemption. Maybe a character who made mistakes in the original story gets a second chance to make things right when they go back. Also, there are often themes of self - discovery as characters re - experience parts of their past and learn more about themselves.
Another possible antagonist could be some of the Hogwarts faculty who were either secretly supporting Voldemort or were too cowardly to oppose him. In a time - travel revenge fanfic, Harry might uncover their true natures and take revenge on them for not doing more to protect the students and the wizarding world from Voldemort's rise.
One popular fanfic in this vein is 'Time's Twist for Harry's Bottom'. It explores the unique concept of Harry being sent back in time due to a magical mishap involving his bottom (in a rather comical way). Another one could be 'Back in Time, Bottom First' which has an interesting plot where Harry has to deal with the changes in the past while his bottom - being the source of the time - travel has some strange side - effects.
Well, in many such fanfictions, the theme of redemption can be found. For example, some characters who were once on the wrong side might be redeemed through their association with Harry as he fights. Also, the exploration of different magical cultures and fighting styles is common. It might show how Harry incorporates elements from different magical traditions to enhance his fighting capabilities. This not only adds more depth to the story but also enriches the world - building in the fanfiction. Moreover, the theme of sacrifice is also prevalent. Harry or his friends might have to sacrifice something in order to achieve victory in their fight.
Sure. One example could be a fanfic where Harry Potter trains in some ancient and lost fighting magic. In this story, he might be mentored by an old wizard who teaches him unique combat spells and maneuvers. This type of fanfiction often explores how Harry could have been an even more formidable opponent against Voldemort if he had additional fighting skills. It also delves into the creative interpretations of the magical combat in the Harry Potter universe.
A great plot twist could be related to the time - travel itself. What if the way time - travel works in the WW2 era is different from how it is in Harry's time? This could lead to him getting stuck or being unable to use his magic properly. Or perhaps he discovers that a certain event in WW2 was actually caused by a wizard from the future (not just him) who was trying to correct something in the wizarding world's past. His attempts to fix things could then make the situation even more complicated as he unknowingly steps on the toes of a much larger time - traveling plan.
Definitely Hermione. Since she's Harry's closest friend and very intelligent, she would be deeply involved in any changes Harry tries to make. Also, Snape. Harry's actions in the past could completely change his relationship with Snape. And of course, Voldemort. If Harry goes back far enough, he could potentially stop Voldemort's transformation into the evil wizard he became.