Spiderman's agility and web - slinging abilities could be combined with She - Hulk's super strength. For example, Spiderman could use his webs to create a net and She - Hulk could throw it with her great strength at enemies. Or Spiderman could swing She - Hulk around to gain more momentum for her attacks.
Their relationship could start as a simple partnership. They meet while fighting crime and gradually start to respect each other's abilities. As they work together more often, they become friends. For instance, Spiderman might initially be a bit intimidated by She - Hulk's strength, but as he sees her use it for good, he warms up to her.
Perhaps a plot where Spiderman and She - Hulk are framed for a crime they didn't commit. They have to go on the run while trying to clear their names. Along the way, they discover that a powerful criminal organization is behind the frame - up. This organization is trying to take over the city's underworld. Spiderman uses his stealth and intelligence, and She - Hulk uses her brute force to fight back against the organization's minions. They also have to deal with the public's distrust of them as they are now seen as criminals.
One possible storyline could be that Spiderman and Red She - Hulk team up to fight a common enemy. Maybe a powerful villain has emerged in the city and their combined skills are needed to take it down. For example, a super - intelligent villain who has created a device that can disrupt all communication and power systems in the city. Spiderman's agility and web - slinging abilities along with Red She - Hulk's strength and durability would make for an exciting battle.
There could also be a plotline where they both enter a mysterious tournament. They have to fight other superheroes and villains in a series of battles. Along the way, they learn more about each other's capabilities and form a stronger bond.
One interesting 'Spiderman and She - Hulk' fanfiction could be one where they team up to fight a new supervillain in New York. In this story, Spiderman's agility and She - Hulk's strength complement each other, and they have to learn to work together despite their different fighting styles.
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.
A frequent theme is the idea of mentorship. Sometimes Spiderman, with his intelligence and quick thinking, can act as a mentor to Hulk in terms of strategy, while Hulk can teach Spiderman about raw power and courage. Also, the theme of protecting the city from common threats is quite common. They have to put aside their differences and work together to keep New York safe.
One common theme is the contrast between their powers. Hulk has raw strength and Spiderman has agility and webs. Fanfictions often play on how they can complement each other in battles.
The Green Goblin could be a great main antagonist. He is a classic Spiderman villain, and his chaotic nature would clash well with the combined forces of Spiderman and Red She - Hulk. His glider and pumpkin bombs could pose a serious threat to the city and force our heroes to work together in new and interesting ways.