Love is a very common theme. Most fanfictions explore the romantic relationship between Acheron and Tory, showing how they fall in love and overcome obstacles in their relationship.
There's also 'Tory and Acheron: The Forbidden Love'. In this one, their love is portrayed as something that goes against the norms of their world. It has a lot of exciting plot twists as they fight against the forces that try to keep them apart. It's a great read if you like a bit of drama in your fanfiction.
I also like the fanfiction titled 'Acheron's Redemption'. It takes a different look at Acheron's journey and how he might find true peace and acceptance. The way it weaves in new relationships for him is really interesting.
Love is also a big theme. Whether it's romantic love or platonic love, his relationships are often a central part of the story. His ability to love and be loved in the face of his difficult past is something that fanfiction authors like to explore.
One common theme is redemption. Since Tory has made some not - so - great choices in the original story, many fanfictions focus on her making amends and becoming a better person.
For Harry, you can focus on his growth beyond what we see in the original series. Maybe he becomes more cynical after all he's been through, and Acheron challenges his views. For Acheron, explore his past more deeply in the context of the fanfiction. Have Harry learn about his traumas and help him heal in some way.
Well, aside from Harry Potter and Acheron, other characters from the original 'Harry Potter' series often play important roles too. Hermione and Ron might be there to support Harry in his new adventures with Acheron. Dumbledore could also make appearances, perhaps guiding Harry and Acheron in their journey, especially if they are dealing with something that has to do with the greater good of the wizarding world.
I found a fanfiction where Tory Nichols teams up with an unexpected ally. It's titled 'Tory's Unlikely Alliance'. This story is great because it takes the character of Tory and puts her in a situation where she has to trust someone she normally wouldn't. It's full of action and also some really touching moments that show a different side of Tory.
Adventure is also a prevalent theme. Tory goes on quests to explore new regions, discover hidden Pokemon, and uncover secrets of the Pokemon world. His adventures are filled with encounters with wild Pokemon, ancient ruins, and sometimes even legendary Pokemon, making for exciting reading.