Maybe in the fanfiction, Spider - Man discovers that Female Carnage has a hidden side. She has some sort of soft spot for the innocent people in the city, which is contrary to what her violent nature implies. This discovery leads to an unexpected bond between them and they start to work together more closely.
In this fanfiction concept, an accident causes Female Carnage to lose her memory. Spider - Man takes advantage of this situation to try and reform her. He shows her the good in the world and how she can use her powers for positive things. As she slowly regains her memories, she has to decide whether to continue on the path of good or return to her old, violent ways.
One possible fanfiction could involve Spider - Man having to face off against Female Carnage in a battle that takes place in a crowded city. He might initially underestimate her power due to her being a female version of Carnage. But as the fight progresses, he realizes she's just as dangerous and has to use his wits and agility to try and subdue her without causing too much destruction to the city.
Well, in some fanfiction, a female human might be a psychic. She senses the Xenomorph's presence before it attacks. Instead of fearing it, she reaches out with her mind and finds that the Xenomorph is in pain. This pain is caused by some kind of alien parasite that's controlling it. So she decides to help the Xenomorph get rid of the parasite, and in return, the Xenomorph protects her from other threats.
Well, in Zootopia vampire fanfiction, an alliance could form between a vampire and a police officer. For example, a vampire bat who has insider knowledge of the criminal underworld in Zootopia could team up with a police dog. The vampire bat might be trying to redeem itself by helping the police, and the dog has to overlook the fact that his new partner is a vampire. Together, they could solve crimes that no one else could, like a series of mysterious disappearances that are actually the work of a rogue vampire group.
A simple idea in this fanfiction could be a one - time alliance. They meet by chance during a city - wide emergency. Sue is already on the scene, trying to contain the situation with her powers, and Spider - Man swings in to help. They quickly figure out how to work together, with Sue providing cover and Spider - Man taking out the smaller threats.
Hermione in Slytherin might form an alliance with Tom to uncover some long - forgotten magic. Their combined skills, Hermione's research abilities and Tom's natural talent, could lead them to discover a powerful spell or artifact that has been lost for centuries.
A possible fanfiction plot could be that Yuri Watanabe gets superpowers herself and she and Spiderman form an even more powerful team. They could have a mentor - mentee relationship where Spiderman teaches her how to use her new powers effectively.
Hawlucha and Noibat could form an alliance against a common enemy in a fanfiction. For example, a group of poachers are trying to capture rare Pokemon in their area. Hawlucha and Noibat, being small but brave, decide to fight back.
Perhaps in a fanfic, Naruto and Maya Natsume are forced to work together in a tournament. They start off not getting along but as they face tougher opponents, they learn to trust and rely on each other. This could lead to a deep friendship or more.
In mermaid x human fanfiction, unusual alliances are common. The mermaid's knowledge of the ocean can be crucial for a human in need. Maybe a human fisherman is lost at sea, and a mermaid helps him find his way back. This forms an alliance based on survival. Another aspect could be that mermaids and humans team up to protect the ocean from some threat. It's an interesting concept as they have different strengths that can be combined for a greater good.
Sometimes in fanfiction, their alliance is more of a political one. Maybe there's a power struggle in the criminal underworld that involves Talia's family and other factions. Batman realizes that by allying with Talia, he can prevent a full - scale war in Gotham. They have to work together, using their different resources and influence, to keep the peace. This kind of alliance forces them to put aside their personal differences and focus on the greater good of the city.