It could be a rogue Amazon who disagrees with the idea of an outsider like Captain America being on Themyscira. She might see him as a threat to their way of life and try to drive him out, or even worse, harm him.
One idea could be Captain America arriving on Themyscira and being initially met with suspicion by the Amazons. But as they learn of his values of justice and courage, they start to respect him. He could then train with the Amazons, sharing his combat techniques while also learning from their unique fighting styles.
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.
Captain America would probably remain calm at first. He's used to being in tough situations. He'd try to talk to Loki, reason with him, and find out what Loki wants.
Fanfiction often takes the characters and puts them in new and unexpected situations. When it comes to Captain America and Spiderman texting, it might show a different side of their relationship. For example, they could be texting about their personal lives outside of being superheroes. Spiderman might share his struggles with school and Captain America could offer some words of wisdom from his own experiences growing up in a different era.
There's also the story of Steve's first real mission as Captain America. He was sent on a USO tour at first, but when he got the chance to fight in the real battle, he showed his true courage. He didn't care about the danger and just wanted to do his part to save his comrades and fight against the bad guys.
Well, in some fanfics, they might make Captain America seem like a jerk to create an interesting plot twist. Maybe they show him being overly self - righteous or making bad decisions that go against his usual heroic image.
One possibility in a fanfiction could be that a villain uses a love potion on Captain America. He might start acting out of character, perhaps showing excessive affection towards a particular character. This could create a lot of confusion among his team members who are used to his stoic and duty - bound self.
One idea could be that Captain America is somehow transported to the RWBY universe. He could team up with Team RWBY to fight against the Grimm. His shield would be a unique weapon in that world, and his leadership and combat skills would be highly valuable.