The main characters are obviously Barry and Oliver. Barry is the Flash, with his super - speed and kind - hearted nature. Oliver is the Green Arrow, a skilled archer and a more brooding, serious character.
Well, the plot could involve a lot of confusion at first. Barry and Oliver would have to adjust to each other's lives. Maybe Barry in Oliver's body has to deal with the Star City politics and crime -fighting in a different way. And Oliver in Barry's body might struggle with the super - speed and the Flash's team dynamics.
I think Iron Man and Hulk would be a really interesting pair. Just imagine Tony Stark's brilliant mind trapped in the Hulk's huge, rage - filled body. He would be constantly trying to find a way to control the Hulk's strength and not go on a rampage. And Hulk in Tony's body would be so confused by all the technology and might accidentally set off some of Stark's weapons.
One idea could be a story where Barry, Kara and Oliver team up to face a powerful new villain that none of them could defeat alone. They have to learn to combine their powers and skills in a unique way.
There was a young man, Jack, who through a magical spell switched bodies with a girl, Emma. Jack, now in Emma's body, was astonished by the change. He realized that Emma had a very different daily routine. He had to attend ballet classes which he initially thought would be easy but turned out to be quite difficult. As he spent time in her body, he became more empathetic towards the female experience, like the pressure to look a certain way. Eventually, with the help of an old wizard, they switched back.
Overcoming personal challenges is also a frequent theme. Both Barry and Oliver have their own personal demons. In fanfics, they can support each other through these challenges. For instance, Barry might help Oliver deal with his past traumas, while Oliver could give Barry advice on how to handle the pressure of being a superhero in the public eye.
It's hard to say for sure if there is a great 'barry sings for oliver fanfic' without actually searching. But fanfic writers often come up with creative and unique ideas. Maybe there's one where Barry sings for Oliver in a really touching or humorous way. You should try searching on platforms where fans share their works to find out.
Batman in Catwoman's body would likely be very cautious at first. He's used to his own physical strength and abilities, and now he has to adjust to Catwoman's more agile and stealth - based skills. He might also struggle with the more flirty and carefree attitude that Catwoman often portrays. As for Catwoman in Batman's body, she would have to deal with the serious and brooding nature of Batman, which could be a big change from her own personality.
There could be a scientific experiment gone wrong. For example, they are in a lab for some school project on teleportation or something similar. But instead of teleporting, their minds or consciousness get transferred to each other's bodies. Another way could be through some kind of alien technology. An alien device that was meant for something else malfunctions and causes their bodies to switch.
Once upon a time, there was a girl named Lily and a boy named Tom. One day, they both touched a strange old mirror at the same time in an antique shop. Suddenly, they found themselves in each other's bodies. Lily, now in Tom's body, was shocked to see her new male appearance. She had to deal with Tom's football practice. Meanwhile, Tom in Lily's body had to attend ballet class. In the end, they worked together to find the same mirror again and reversed the situation.