One great 'Supernatural' and 'Arrow' crossover fanfiction is 'The Hunt in Starling City'. It combines the dark, supernatural elements of 'Supernatural' with the gritty, urban setting of 'Arrow'. The story has Dean and Sam Winchester arriving in Starling City to hunt a demon that's been causing chaos in the criminal underworld, which draws the attention of Oliver Queen and his team. They initially clash but then realize they need to work together to stop the greater evil.
One great Merlin - Supernatural crossover fanfic is 'The Hunter and the Warlock'. It combines the magic of Merlin's world with the demon - hunting aspect of Supernatural in a really interesting way. The characters from both shows interact in a believable manner, making for an exciting read.
I really like 'Crossroads of Krypton and the Hunting Life'. In this fanfiction, the writers did an amazing job of bringing in the mythology of Smallville and Supernatural. Dean and Sam Winchester end up in Smallville and get involved with Clark's world. It's full of action and some really cool character moments. It shows how the different powers and skills of the characters from both shows can work together or clash in interesting situations.
One great Supernatural and NCIS crossover fanfiction is 'The Hunt in Quantico'. It combines the mystery-solving aspect of NCIS with the supernatural elements of Supernatural really well. The characters from both shows interact in a very believable way, and the plot keeps you on the edge of your seat.
A popular one is 'Crossing Paths'. This fanfiction has an interesting take on the crossover. It starts with a mystery that involves both the Supernatural and Buffy universes. The author does a great job of writing the characters true to their original personalities. Buffy's determination and the Winchesters' tough - guy attitudes are on full display, and the story builds up to a very satisfying climax.
Well, there's 'Parallel Encounters'. In this fanfic, the settings of Supernatural and Tramiplier are merged in a really interesting way. It starts with a character from Tramiplier accidentally stumbling into the world of Supernatural. The story then unfolds as they try to find their way back while getting involved in the ongoing battles against demons and other evils in the Supernatural realm. It's full of action and some really cool character interactions.
A cool plot could be a time - travel crossover. The 'Supernatural' crew travels to a time when Star City was in its early days. They meet a young Oliver Queen and end up changing some events that have a ripple effect on both their universes. This could lead to new alliances and new enemies. Also, a powerful witch from 'Supernatural' could put a spell on Star City that only the combined efforts of the two groups can break.
One common theme is the clash of two different worlds. Arrow is mainly about a city full of crime and vigilantes, while Supernatural is all about the supernatural world. So, when they cross over, there's often a struggle to understand each other's ways. For example, Oliver might be skeptical of the existence of demons at first, while Sam and Dean might not be used to dealing with high - tech security systems in Star City.
Well, it's about the characters. Both shows have a great set of characters. 'Supernatural' has the complex and lovable Winchester brothers, and 'Arrow' has Oliver Queen with his own set of friends and enemies. In crossover fanfiction, these characters can interact in ways that are not possible in their original shows. Imagine Dean Winchester teaching Oliver Queen some of his hunting skills, or Felicity Smoak helping Sam Winchester with some tech - related supernatural mystery. It's these kinds of interactions that make it appealing.
One great Flash and Arrow crossover fanfiction is 'The City's Heroes United'. It has a really engaging plot that combines the unique abilities and personalities of the characters from both shows. The author does a great job of making the interactions between Flash and Arrow's characters feel natural.
One great Arrow time travel fanfiction is 'Time's Arrow'. It has an interesting plot where Oliver Queen travels back in time and has to change certain events to save his city in a different way. The character development in this fic is really well - done.