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.
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.
One great Buffy and Charmed crossover fanfiction is 'The Power of Two Worlds'. It combines the unique magic systems of both shows in an interesting way. The characters from Buffy and Charmed have to team up to fight a common enemy that threatens both their universes. The author does a good job of keeping the personalities of the original characters intact.
I really liked 'When Hunters Meet Slayers'. It's a well - written fanfic that does a good job of melding the two universes. It has some great action scenes where Sam uses his research skills to help Buffy and her gang figure out a new type of demon that has emerged, which is a combination of a demon from 'Supernatural' and one from 'Buffy'.
There's also 'Bones Meets Buffy'. In this fanfic, the two universes collide when a series of murders in Buffy's Sunnydale seem to have a connection to some archaeological finds that Bones is researching. It's a fast - paced story that keeps you on your toes. The author does a good job of maintaining the personalities of both sets of characters. For example, Bones is as logical and matter - of - fact as ever, while Buffy is her brave and sassy self.
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.
Sure. One great piece of Xena crossover fanfiction is 'Xena Meets Merlin'. It combines the world of Xena with the magic and mystery of the Arthurian legend. The story weaves an interesting plot where Xena's warrior skills are put to the test in a new and magical realm.
A common theme is the rekindling of their relationship. Whether it's a romantic or a platonic bond, it often focuses on how they reconnect. Another theme is the fight against a greater evil. Since both are from the Buffyverse which is full of demons and dark forces, this is a natural theme.
One great 'angel and buffy crossover fanfiction' is 'Crossed Paths'. It beautifully weaves their two worlds together, exploring their complex relationship in a new and exciting way. Another one could be 'Reunion' which focuses on how they handle a new threat together after being apart for a while.