Adventure is important. Through adventures, they get to know each other better and their bond grows. Also, mutual understanding. They need to understand each other's quirks as magical beings.
Magic is surely a key element. Their magic powers are part of what makes their relationship special. It allows them to have unique experiences together.
Cosmo and Wanda are two characters. Their love story might be filled with magical moments. They could have met in a magical realm and gradually fallen in love as they shared adventures together, using their magic powers to overcome difficulties and protect each other.
The key elements start with his identity as a space - bound dog from the Soviets. Then, the cosmic event that endows him with special powers is important. His role as a guardian at Knowhere, which is made possible by his new - found telepathic abilities, is also a significant part of his origin story.
For the Marvel Wanda, one key element is her family's death. Losing her parents and then her brother Pietro was a huge part of her back story. It influenced her actions and her emotional state. Another is the Hydra experiments. These gave her powers but also put her in a dangerous and difficult situation. And of course, her relationship with Vision is a major element too.
One key moment was when Vision comforted Wanda after a difficult battle. It showed their growing closeness. Another was when they shared their first dance at a gathering in the compound. It was a sweet moment that signified their deepening relationship.
One key moment was when they first realized their feelings for each other at the Avengers base. Another was when they shared quiet, domestic moments in WandaVision. And of course, Vision's sacrifice was a crucial moment that showed the depth of their love.
A significant moment in their love story was when they worked together to overcome a big obstacle. They had to trust each other completely, and this trust strengthened their relationship. Also, when Cosmo made a special gift for Tails, it showed her affection for him in a very tangible way.
The key elements are her Sokovian origin, the death of her parents, and Hydra's experiments with the Mind Stone which gave her powers.
One common theme is adventure. Cosmo and Wanda might go on some magical adventures together in the fanfics. They could be exploring new magical realms or trying to solve some magical problems in the Fairy World.
There might be a fanfiction where Cosmo and Wanda have to deal with a powerful dark magic that is threatening the fairy world. They team up with other fairies and use their combined powers to fight it. In this story, we could see new aspects of their personalities as they face this great danger.
I'm not sure precisely, but it could include Wanda Durant's character traits like her resilience. Maybe her ability to face challenges head - on is a key element.