Perhaps Harry discovers a way to travel to the Marvel universe and becomes enamored with the Avengers. He might then try to prove himself to them, showing off his magic skills and offering to help them in their battles.
It could be that the Avengers somehow end up in the wizarding world. Harry, being a huge fan, is overjoyed and tries to help them understand the magic there. Along the way, they team up to fight a dark force that is threatening both worlds. This would involve a lot of action, with the Avengers' powers and Harry's magic working together.
It could be that Harry discovers he has some sort of connection to the Infinity Stones. So, the Avengers seek his help to understand and control the power of the Stones. Along the way, he has to deal with his own past traumas as well as the new threats in the Marvel world. He might teach the Avengers some magic too, like how to apparate short distances for quick escapes or attacks.
Maybe it's about Harry always looking up to the Weasleys. He might be fascinated by their large family, the way they support each other. He could be constantly seeking their advice or just enjoying their company. For instance, he might love spending holidays at the Burrow with them.
Well, it could be that Harry Potter discovers he has a connection to Sparda. Maybe he has some latent power that is related to Sparda's abilities. He then has to learn to control this new power while still dealing with the threats in his own wizarding world. And perhaps he uses his new - found powers to fight off dark wizards in a more badass way.
It could be a story where Harry somehow comes into possession of Fleur in a magical sense. Maybe he saves her from a dark spell that binds her to him, and then they have to figure out how to break the spell while developing an unexpected bond.
It could potentially be a great fanfic. It might bring together two very different fandoms in a creative and engaging manner. Imagine Harry getting involved with the Avengers to fight a common enemy that threatens both the wizarding world and the normal world. The fanfic could also delve into the relationships Harry forms with the Avengers, like a mentorship with Tony Stark or a friendship with Captain America, which would make it stand out.
The plot could involve Harry Potter being transported to the Avengers' universe. He might use his magic to help the Avengers fight against a common enemy, like Thanos. For example, his invisibility cloak could be used for stealth missions, and his spells could be a new form of defense against alien threats.
Well, perhaps Harry discovers the Avengers through some magical means like a spell gone wrong that transports him to the MCU world. He could be in awe of their powers and decide to learn from them, and then try to incorporate their fighting styles into his own magical battles.
In this fanfic, Percy might be seen as an outcast at first among the Avengers because he's so different. But as time goes on, they come to respect his abilities. The story could also explore how Percy's presence affects the dynamics within the Avengers. Does he create new rivalries or alliances? And how does he adapt to their high - tech world when he's used to the more ancient and magical world of the Greek gods? Maybe he even tries to introduce some of his own magic into their technology, leading to some interesting and unexpected results.
The story could start with the Avenger having a bad day. They are feeling really down. Then they find a stray dog. At first, they're not sure what to do with it. But as they spend more time together, the dog's loyalty and unconditional love start to heal the Avenger's emotional wounds. Meanwhile, they also discover that the dog has a connection to an old enemy, which leads to a new adventure.
One possible plot could be that a new, extremely powerful and irresistible poison is created by a dark wizard. The main characters, like Harry, Hermione, and Ron, have to find an antidote before it spreads and kills many students at Hogwarts.