It could be Captain America. He has a strong sense of justice and kindness. So, if he found a dog, he would surely take it under his wing and protect it. Maybe he'd even train the dog to be a mascot for the Avengers.
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.
Captain America is a likely candidate. He has a strong moral compass and a sense of protectiveness. He would see it as his duty to take care of the baby. His old - fashioned values would make him a great caregiver, like making sure the baby has a proper upbringing even in the middle of all the chaos in the Avenger's world.
One common plot could be the Avenger taking on a protective role over the baby. For example, they might keep the baby safe from villains who are after it for some special power the baby has. Maybe the baby is related to some important figure in the Avenger's world. Another plot could be the Avenger trying to find the baby's family while forming a bond with the baby during the search. They could face many challenges along the way, like dealing with other characters who misunderstand their intentions with the baby.
That's a heart - warming story. Often, lost dogs are found by kind - hearted people who then offer them a new home. There are also many animal shelters that help lost dogs get adopted into loving families.
Percy could also be a big fan of Hulk. Just like Percy has his own 'inner beast' that he sometimes has to control (his demigod powers), Hulk has his own anger issues. Percy might see a bit of himself in Hulk and also be in awe of Hulk's raw strength. He would probably be interested in seeing if there's a way to help Hulk better control his rage, using his own experiences of self - control.
One great 'Avenger fanfic' could be the one where Spider - Man has to team up with Doctor Strange to defeat a new magical villain in New York. It's exciting as it shows Spider - Man's quick - wittedness against Strange's powerful magic.
Well, in fanfic, Avengers' preferences can vary widely. Natasha Romanoff may prefer to work alone on certain missions. This shows her independent and self - reliant nature. Bruce Banner might have a preference for quiet and isolated places where he can do his research without distractions. Also, Clint Barton could be written as having a preference for simple weapons like his bow and arrow, as it represents his down - to - earth and no - frills attitude.
Teamwork is also a very common theme. In these crossovers, the characters have to learn to work together quickly. They come from different backgrounds and have different ways of doing things. In a 'Avenger crossover fanfic' where they cross with the Guardians of the Galaxy, the Avengers' more structured approach has to mesh with the Guardians' more free - wheeling style. This theme of finding common ground and working towards a common goal is often explored in great detail. It usually involves a lot of character development as they overcome their initial differences and start to trust and rely on each other.
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.