There are mcu male oc fanfics that focus on the character's origin story. Maybe he's an alien who crash - landed on Earth long before the events of the movies. His struggle to fit in and understand human culture while hiding his true identity can make for a really engaging fanfic. He could then get involved in MCU events in unexpected ways.
First, give your male OC a unique backstory. It could be related to an event in the MCU. For example, if he's from Asgard, his story might involve the fall of Asgard. Second, define his powers or skills. Maybe he has the ability to manipulate energy like Doctor Strange but in a different way. Third, give him some flaws. No one is perfect, and this makes the character more relatable. For instance, he could be overconfident at times, which gets him into trouble.
An interesting MCU OC fanfic idea could be an OC who is a journalist. They are always on the hunt for the next big story about the superheroes. This could lead them into all sorts of dangerous situations as they try to get exclusive interviews or expose secrets. Another could be an OC who is a mutant in the MCU (even though mutants are not as prominent yet). This OC would have to deal with being different and feared, while also trying to use their powers for good. And a third idea is an OC who is a reformed villain. They were once on the wrong side but now want to make amends and help the heroes in their fight.
You need to decide how your male oc fits into the MCU universe. Will he be a hero, a villain, or something in between? If he's a hero, think about what his motivation is. Is it to protect his family, seek revenge, or something else? Once you have these basics, start writing scenes. Maybe start with a small moment that shows off his personality, like how he reacts when he first discovers his powers.
One idea could be creating a male OC who is a brilliant scientist from a small town. He discovers a new form of energy that attracts the attention of Tony Stark. Another could be a male OC with super speed who has to hide his powers until he's forced to use them to save a city. Maybe a male OC who is an alien prince stranded on Earth and has to learn about human culture while also trying to find a way back home.
First, create your OC. Decide on their appearance, personality, backstory, and powers if they have any. For example, if your OC is a super - powered being, think about how they got their powers. Then, figure out where they fit into the MCU. Are they a new hero in New York? Or maybe they're from another planet. Next, come up with a basic plot. It could be something like your OC teams up with the Avengers to stop a new threat. And finally, just start writing. Don't worry too much about getting it perfect at first.
One idea could be that the male OC is a new superhero who saves the day in unique ways. His harem could consist of different female characters from the MCU, like a SHIELD agent, an Asgardian, and a Wakandan warrior. They are all attracted to his courage and his different perspective on heroism.
First, define your male OC. Decide on his appearance, his powers or skills, and his personality. For example, if he's a tech - genius, think about what kind of tech he specializes in. Then, figure out how he fits into the MCU. Is he a hero, a villain, or something in between? Next, come up with a plot. It could be something like he discovers a hidden threat to the world and has to team up with the Avengers to stop it.
For the male OC, give him a unique backstory. Maybe he's from a small town with a big secret. For the female characters in the harem, highlight their individual strengths. For example, if it's Black Widow, focus on her combat skills and her complex past. Let their relationships develop gradually through shared experiences like fighting a common enemy.
One way to create a Kryptonian OC (Original Character) in MCU fanfiction is to first understand the basic traits of Kryptonians in the DC lore. Kryptonians are known for their super strength, flight, heat vision etc. In an MCU context, you could blend these traits with the existing MCU universe's rules. For example, how would a Kryptonian's powers interact with the Infinity Stones? Maybe your OC could be a Kryptonian who was sent to the MCU universe by some cosmic accident. Their journey could involve learning about this new universe while also trying to hide their true identity as they are far more powerful than most beings there.