He might fit in as a sort of mentor figure. He has years of experience fighting crime in Gotham. He could teach the younger Avengers like Spider - Man (if he's in the mix) some valuable lessons about perseverance and the importance of a strong moral code. Also, his physical combat skills would be useful in hand - to - hand battles against powerful foes.
Harry could fit in by using his magic for reconnaissance. His invisibility cloak would be great for spying on enemies unnoticed. The Avengers could use this to their advantage when planning attacks.
Batman would fit in by being the ultimate strategist. The Avengers sometimes jump into action without a fully thought - out plan. Batman's meticulous planning would force them to be more organized. He could also provide a more grounded perspective. Many of the Avengers have superpowers and deal with large - scale threats from outer space or magic realms. Batman, coming from the streets of Gotham, would remind them of the importance of protecting the everyday people.
In a fanfic, Harry Potter could enter the Avengers' story through a magical portal. Once there, he could use his magic to complement the Avengers' skills. For example, his ability to communicate with snakes could be useful if they encounter snake - like villains. His experience with horcruxes might also give him insights into dealing with powerful and hard - to - destroy enemies in the Avengers' world. His wand could be a unique weapon in their battles, and his ability to perform complex spells could turn the tide in difficult situations.
They could start by trying to understand the different rules of that world. Since Batman's world is more grounded in detective work and street - level crime fighting compared to the Avengers' world of superpowers and global threats. The Avengers might use their powers to help solve some of the complex mysteries in the Batman fanfic world. For example, Vision could use his ability to see through objects to find clues that Batman might miss.
Shazam could fit into the Avengers by being the young, enthusiastic addition. His powers are on par with many of the Avengers, so he could contribute in battles. For example, his flight ability could be useful for scouting or quick attacks. He could also bond with the younger - at - heart Avengers like Spider - Man, if he were in the team. His moral compass could also help keep the team on the right track when making difficult decisions.
In fanfiction, he could fit in through his values. Superman has a strong sense of justice and morality, which would align well with the Avengers' goals. He could also form friendships with the members, like a bromance with Thor due to their similar god - like statuses.
Sasuke could fit in as a stealth and combat expert. His ability to move silently and strike quickly would be valuable. He could also use his sharingan to analyze threats and come up with strategies.
Batman joining the Avengers in a fanfic could be due to a common enemy like a super - intelligent villain who has been causing chaos in both the DC (Batman's world) and Marvel (Avengers' world). Batman might initially be a bit of an outsider among the Avengers. But his no - nonsense attitude and ability to plan ahead could earn their respect quickly.
Well, Will Solace could potentially be a healer in the Avengers fanfiction. His skills in treating the wounded could be really useful. He could patch up the Avengers after their battles, much like how he does in his original series. Maybe he'd be a bit out of place at first with all the high - tech and super - powered stuff going on, but his kind heart and medical expertise would soon make him an important part of the team.
She could fit in as a specialist in the supernatural. The Avengers often deal with high - tech threats, but Buffy's expertise in the world of demons and magic would be a fresh addition. She could be the one to handle the more 'creepy - crawly' threats that the Avengers might not be fully equipped for.