One common theme is the idea of the Hulk finding acceptance among the female characters. Since he's often seen as an outcast, in these fanfictions, the female characters welcome him into their group. Another theme is teamwork. They all have to work together to face various villains or challenges in the Marvel universe.
Well, there's 'The Hulk's Harem Adventure'. It's a story where the Hulk, in his own brute yet endearing way, forms a special bond with a group of Marvel female characters. It has a lot of action scenes intertwined with the development of their relationships. Also, 'Hulk's Harem of Heroes' is quite interesting. It shows how the Hulk's presence affects the female heroes in the Marvel universe and how they all come together in an unexpected way.
Spiderman is the key, of course. In addition to the well - known female characters from the Spider - Man universe, there might be other characters from the Marvel world who cross paths with him and end up in the harem. For instance, Black Cat could be a likely candidate. She has that alluring and mysterious personality that would fit well in this kind of scenario. Also, characters from different dimensions or alternate universes could be brought in, adding an element of the unexpected to the harem and the overall story.
One interesting plotline could be Spiderman having to balance his superhero duties with the complex relationships in the harem. Maybe he has to keep his identity secret from some of the harem members while also protecting them from villains.
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 common plot is that Spider Man's harem is formed due to some kind of magical or scientific experiment gone wrong. For example, a device meant to create a new type of energy instead creates a bond between him and several Marvel women. As a result, they have to learn to live together and deal with the new dynamic, which includes fighting bad guys and exploring their new relationships.
The Abomination could be a great main antagonist. He already has a history with the Hulk and his hatred for Hulk could extend to She - Hulk as well. He could be trying to create a new gamma - based weapon to finally defeat the Hulks once and for all.
The separation of the Hulk and Banner varies in Marvel comics. Sometimes, external forces or internal conflicts cause them to split, but it's not a consistent occurrence throughout all comics.