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.
Well, one way their worlds could collide is through a multiverse - type situation. Maybe a powerful villain or some sort of magical anomaly creates a rift between the Naruto universe and the She - Hulk's world. Naruto, with his ninja skills and determination, could find himself in She - Hulk's world and be quite confused at first. He'd see all these different laws of physics and technology that he's not used to. And She - Hulk, being a lawyer in her normal life, might initially view Naruto as some sort of strange threat or at least a mystery to be solved. But as they interact, they could learn from each other. Naruto could show She - Hulk the importance of loyalty and hard - work within a team, while She - Hulk could introduce Naruto to the concept of a legal system and justice in a more modern, Western sense.
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.
They could have a mentor - mentee relationship. Naruto, with his vast combat experience and strong moral code, could mentor She - Hulk in certain aspects. For instance, Naruto could teach She - Hulk about the importance of self - control when using power. On the other hand, She - Hulk could be Naruto's guide in the modern world of her universe, helping him understand things like technology and complex social structures.
A plot could revolve around a scientific experiment gone wrong that affects only them. They start to lose control of their powers in different ways. Hulk might become too calm and lose his rage - fueled strength, while She - Hulk might turn into her human form at the wrong times. They have to work together to reverse the effects of the experiment, all while dealing with the problems that come with their power - changing states.
One idea could be that they team up to face a new super - villain who is immune to normal Hulk - like strength. So, they have to combine their smarts and unique Hulk - related abilities in a new way. Another could be a story where they explore their family connection in a more in - depth way, like dealing with the implications of being related Hulks in a world that still doesn't fully understand them.
She - Hulk's legal background would add an interesting dimension. The Justice League often deals with complex situations that could involve legal aspects. She could help them navigate through any legal loopholes or treaties. For example, if they have to deal with an international incident caused by a supervillain, she could be the one to sort out the legal implications.
A common theme is the power dynamic. Since She - Hulk has super strength and is a well - known superhero, the OC often has to find their place in relation to her power. For example, in some stories, the OC may start off being intimidated but then grows to be her equal in some way.
Friendship or at least a form of understanding is also a common theme. Despite their differences, many fanfictions show them coming to terms with each other. For example, in some stories, they start to realize that they have more in common than they thought. They may both be strong female characters in a male - dominated world, and this shared experience can lead to a bond between them.
A plot could involve a portal opening between their two universes. Naruto, being the curious ninja he is, steps through and finds himself in She - Hulk's world. She - Hulk is initially skeptical of this strange newcomer but as Naruto shows his skills and good heart, she becomes interested. They then embark on a journey to close the portal before it causes more chaos, and during this time, their relationship blossoms.