The Scarlet Witch is a great candidate for a crossover with She - Hulk. Her reality - warping powers and She - Hulk's physical might could create some really unique storylines. Maybe Scarlet Witch accidentally warps reality in a way that affects She - Hulk's powers, and they have to work together to fix it. Also, Ant - Man could be fun. She - Hulk could be accidentally shrunk by one of Ant - Man's devices and they have to figure out how to reverse the process while also dealing with threats in the micro - world.
One possible storyline could be that Naruto is somehow transported to the Marvel universe and meets She - Hulk. They might initially be at odds due to their different worlds and ways of doing things. But then, they realize they can learn from each other. Naruto could teach She - Hulk about chakra and his ninja techniques, while She - Hulk could show Naruto the advanced technology and different superpowers in the Marvel world.
Captain America would be a great addition. His leadership and moral compass could guide Hulk and She - Hulk when they face difficult decisions. And his combat skills could come in handy during battles.
One idea could be a crossover with Spider - Man. She - Hulk and Spider - Man team up to take on a new villain in New York. Maybe this villain has the ability to manipulate technology and is causing chaos in the city. Another plot could involve a crossover with Doctor Strange. She - Hulk accidentally gets caught in a magical spell and is transported to a different dimension. She has to work with Doctor Strange to find her way back home while also dealing with the threats in that dimension. A third plot could be a crossover with the X - Men. She - Hulk joins forces with the X - Men to protect mutants from a new anti - mutant group that is using dangerous new weapons.
One key element is the power dynamic. Given their super - strength and large - scale capabilities, how they interact with each other in terms of power usage is often explored. For example, in some fanfictions, they might have to hold back their strength when being affectionate.
Sure, She-Hulk is related to Hulk. Jennifer Walters, aka She-Hulk, got her powers because of a blood transfusion from her cousin Bruce Banner, who is Hulk. This connection is a key part of their storylines in the comics.
One idea could be a team - up story. Batman and She - Hulk have to work together to stop a powerful villain who is causing chaos in Gotham City. Maybe the villain has some sort of technology that is affecting the citizens' minds, and She - Hulk's strength and Batman's detective skills are needed to figure out the source and stop it.