A popular one is 'The Bond of Heroes'. This fanfiction delves deep into the relationship between Xena and Hercules. It shows how they support each other through various challenges, and the character development is top - notch. The descriptions in this story are so vivid that you can easily picture the scenes in your mind.
The settings. The world of Xena and Hercules is full of myth and magic. Fanfiction can expand on these elements. For example, a story might take them to a new, undiscovered land filled with strange creatures. It also lets fans create their own versions of the known settings, adding new twists to places like Xena's home village or Hercules' training grounds.
One idea could be to explore how Hercules' incredible strength affects the Fate universe. Maybe he is summoned as a Servant in a Grail War and his brute force challenges the traditional battle strategies of other Servants. His Twelve Labors could also be incorporated in some way, like each Labor being a trial he has to face within the context of the Fate story.
One common theme is the clash of cultures. For example, when Hercules crosses over into a modern - day superhero universe like the Marvel or DC universe, his ancient Greek values and ways of doing things are very different from the modern heroes. Another theme is power dynamics. Hercules is extremely powerful, so when he teams up or clashes with other powerful characters, it creates interesting scenarios.
Character relationships are also common. In a 'hercules crossover fanfic', Hercules might form an unlikely friendship or rivalry with the characters he crosses over with. This relationship development is often central to the story. He could learn from them and they from him, like when he crosses with a more tech - savvy character, he might start to understand the value of intelligence in addition to strength.
Staying true to Xena's character. Xena is known for her strong will, her combat skills and her moral code. In any crossover fanfiction, she should still be recognizable as that character. If she suddenly starts acting completely out of character, like being cowardly when she's always been brave, it can ruin the whole story. So, make sure the author respects who Xena is while exploring new crossovers.
In a Naruto - Hercules crossover fanfiction, the story could center around the values both characters represent. Hercules is known for his heroism and physical strength, while Naruto is about never giving up and his strong bonds with friends. So, perhaps they meet and learn from each other. Naruto could teach Hercules about the power of friendship and believing in oneself even without having god - like powers, and Hercules could show Naruto how to use his physical strength more effectively. They could then team up to fight a common enemy that threatens both their worlds.
Well, a big theme is adaptation. Hercules has to adapt to the rules of the Fate world which are very different from his own. There's also the theme of conflict. His straightforward, strength - based approach may clash with the more complex and magical ways of the Fate characters. Additionally, the theme of heroism is explored. He has to prove himself as a hero in this new context, not just relying on his well - known feats from his own mythology.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fan - created stories, and you can use the search function to specifically look for Buffy Xena crossovers. Another option is FanFiction.net, which also has a wide range of fanfiction, though the interface might be a bit different.
One interesting Buffy Xena crossover fanfiction could be where they team up to fight a common supernatural foe that combines elements from both their universes, like a vampire - centaur hybrid. Another might involve Xena teaching Buffy some of her combat skills, which Buffy then uses in a big battle against a powerful demon in Sunnydale.