One possible scenario could be that Captain Marvel is actually an alien spy all along. Maybe she was sent to Earth to gather information for her home planet but ended up developing a connection with Earth and its people, and her identity is revealed when her home planet tries to recall her for a more aggressive mission.
Some of her terrestrial enemies, like certain power - hungry individuals or organizations, might see her true identity as a way to gain power. They could try to capture her and study her to replicate her powers. Or they could try to blackmail her into doing their bidding by threatening to expose her identity to the public in a way that would make her a pariah.
One idea could be a story where Captain America and Captain Marvel team up to face a new cosmic threat that's headed towards Earth. They have to combine their unique skills, with Captain America's strategic mind and combat experience on the ground, and Captain Marvel's incredible cosmic powers in space battles.
One great fanfiction is 'Allies in the Cosmos'. It beautifully weaves together the storylines of Captain America and Captain Marvel. In this fic, they team up to face a new alien threat that neither could handle alone. The writer does an excellent job of capturing their unique personalities and how they complement each other in battle.
One great 'Miraculous Identity Reveal Fanfiction' is 'The Unveiling'. In this story, Ladybug and Chat Noir's identities are revealed in a very dramatic way during a battle with a powerful akuma. The author does an excellent job of portraying their shock and how it changes their dynamic.
One possibility in Captain Marvel x Valkyrie fanfiction could be an adventure where they team up to fight a common enemy. They both are strong and powerful characters. Maybe they start off not getting along well due to their different personalities and ways of doing things, but as the story progresses, they learn to respect and rely on each other.
Such fanfiction is not okay. Captain Marvel is a powerful and inspiring character. Creating sexual fanfiction about her reduces her to a mere object of sexual fantasy rather than celebrating her as a hero. It also may make many fans uncomfortable, especially those who look up to the character for her strength and positive influence.
A good 'Miraculous Identity Reveal Fanfiction' often has strong character development. When their identities are revealed, how the characters change and grow is crucial. For example, if Marinette and Adrien find out about each other, their relationship might shift from a flirty superhero partnership to something more serious.
In fanfiction, Peter's field trip could be a great setting for an identity reveal. Maybe he's a superhero in disguise and during the field trip, something unexpected happens that forces him to show his true self. For example, a danger might emerge that only his superhero identity can handle.
In the book, the female protagonist and the male protagonist met for the first time on a plane. The female protagonist thought that the male protagonist was an ordinary person, but later found out that the male protagonist was the CEO of a wealthy family. They later broke up due to some misunderstandings, but when they met again, the female lead was still full of attraction to the male lead. The male protagonist was willing to change his cold appearance for the female protagonist, and their relationship developed. I hope you like this fairy's recommendation. Muah ~😗