Thor could be a main character. His godly powers and his somewhat otherworldly nature would add an interesting element to the story. And then there's Snape. His complex personality and his skills in potions and the dark arts could play a significant role, especially if there are plot elements related to poisons or dark magic that the Avengers need to deal with.
Well, it could be about Harry Potter somehow ending up in the Avengers' universe. Maybe he uses his magic to help the Avengers in a battle against a powerful new enemy. For example, he could use spells to disable high - tech weapons of the bad guys that the Avengers are having trouble with.
Not having read the 'redemption a harry potter avengers fanfiction', I can only make assumptions about the main characters. It could potentially center around a misfit character from Harry Potter, perhaps Draco Malfoy, who is seeking redemption and teams up with a reformed villain from the Avengers, like Loki. Or it could be about Harry Potter and Thor, both having their own burdens of heroism and they come together in a story about finding a new kind of redemption that combines their different worlds' values and challenges. There are so many possibilities when it comes to combining these two rich universes.
Obviously, Harry Potter himself would be one of the main characters. And for the Lamia, it could be a female Lamia named Lyra. She could have special powers like being able to communicate with snakes in Hogwarts and she teams up with Harry.
Peter Parker (Spider - Man) could also be a great main character for this kind of fanfiction. His youthful charm and heroic nature would appeal to characters in both universes. He could be on a school exchange program in Hogwarts (using some multiverse - like excuse) and during his stay, he gets involved with helping the wizards while also catching the eyes of Ginny Weasley, MJ, and Black Widow, creating an interesting harem situation.
The main character could be Hermione Granger. Since she is very intelligent and has a strong sense of justice, she could easily be re - imagined as a lawyer. She could use her vast knowledge of magic and her quick thinking to bridge the gap between the two worlds and help the Avengers out. For example, if there was a spell that was being misused in the Avengers' world, she could figure out how to stop it legally.
Voldemort could be a likely main antagonist. He's the most powerful dark wizard in the Harry Potter series. He might see the Avengers as a threat to his plans of total domination, not understanding their world but still seeing their power. So, he could use his dark magic to torture them, trying to break their will before eliminating them.
Maybe a group of pure - blood supremacists who didn't like the changes that Harry brought to the wizarding world after the war. They believe that the old ways of pure - blood dominance should be restored and will stop at nothing to oppose Harry's new beginning, which includes more equality among all wizards and witches.
It could be a new student at Hogwarts. This student might come from a non - magical family but has a strong connection to magic that they didn't know about before. Their journey at Hogwarts would be their new beginning at life in the wizarding world.
Obviously, Harry Potter and Rey could be the main characters. Harry has his skills in magic and combat against dark forces, and Rey has her connection to the Force and her combat skills. They could be the central duo, with each learning from the other.
The main characters would be Harry Potter and Leela. Harry, who has grown up in the wizarding world, has a deep understanding of magic and its rules. Leela, coming from a different background entirely, has her own set of skills and a unique perspective. Neville could also play a role. He could bond with Leela over their shared experiences of being underestimated. Dumbledore might also be an important character, guiding the two main characters as they navigate the challenges that come with the merging of their two very different worlds.