You could also check out Tumblr. There are often communities dedicated to 'teen wolf' fanfiction. People might share links to their favorite crossovers or even post their own works there.
Fanfiction.net also has a lot of 'teen wolf' related fanfictions. However, the quality can vary. Look for ones with high ratings and a lot of reviews. It might take some time to sift through, but you can find some real gems.
First, you need to understand the two universes well. Know the rules of magic in Harry Potter and the werewolf lore in Teen Wolf. Then, create a unique plot that combines elements from both. For example, a spell that affects werewolves in a new way. Next, develop your characters. Let them interact in interesting ways. If Harry Potter meets Scott, how would they react to each other's powers? Also, keep the pacing right. Don't rush through the story but also don't drag it out too long.
Imagine a story where the Deathly Hallows are in the Teen Wolf world. The Teen Wolf characters don't understand what they are at first. But then they team up with some HP characters who have come to retrieve them. They have to battle a powerful dark force that wants to use the Hallows for evil in the Teen Wolf realm. This would combine the magical elements of HP with the action - packed werewolf lore of Teen Wolf.
Character interactions are key. Imagine Stiles from Teen Wolf and Rumplestiltskin from Once Upon a Time having a conversation. It should be both interesting and in - character. The fanfic should also introduce a new and exciting plot that couldn't exist in either show alone. Maybe a new threat that combines the darkness of the Nogitsune from Teen Wolf and the power - hungry villains from Once Upon a Time. Another important aspect is the setting. How will Beacon Hills and Storybrooke interact? Will there be a merge of the two or just portals between them?
One great piece of spartacus and teen wolf crossover fanfiction is 'Spartacus in Beacon Hills'. It combines the gladiatorial world of Spartacus with the supernatural elements of Teen Wolf. The story has Spartacus somehow transported to Beacon Hills and his warrior skills are put to use against the various threats in the Teen Wolf universe.
One popular idea is a crossover with 'The Vampire Diaries'. The werewolves from 'Teen Wolf' could interact with the vampires and witches in that universe. It could lead to some really interesting power dynamics and relationships.
Survival is another big theme. In both Spartacus' world where they have to fight for their freedom against the Romans and in the Teen Wolf world where they are constantly facing supernatural threats, survival is crucial. In the crossover fanfiction, the characters often have to combine their skills to survive in new and unexpected situations.
There's also 'Minds in the Supernatural'. In this fanfic, the BAU team is called to Beacon Hills to investigate a series of murders that seem to have a supernatural connection. It does a great job of blending the two worlds, and the character development is quite engaging. It shows how the Teen Wolf characters react to the more scientific and methodical approach of the Criminal Minds crew.
Sure, it's normal. Just think about it. Fanfiction often delves deeper into the emotions, relationships, and backstories of the characters. For Teen Wolf, seeing these different takes on their own story could be really interesting. It's no different from an actor reading reviews or interpretations of their work. It's a way to be more involved in the cultural phenomenon that has grown around the show.
One main theme is the clash of different worlds. The supernatural world of Teen Wolf and the crime - solving world of Criminal Minds are very different. So, how the characters from each deal with the other's world is a big theme. For example, the BAU agents might be skeptical of the supernatural at first.
One great Teen Wolf and Once Upon a Time crossover fanfiction is 'The Lost Wolf in Storybrooke'. It combines the dark, supernatural elements of Teen Wolf with the fairytale - like world of Once Upon a Time. The story has Scott McCall finding himself mysteriously transported to Storybrooke and having to navigate the new rules and characters there. It's really exciting to see how he interacts with the likes of Emma Swan and Regina Mills.