A really cool concept could be that Naruto has to learn how to control the Hulk - like rage within himself. He discovers a new form that is similar to the Hulk's transformation, but it's powered by his own chakra. And the Hulk, in turn, could learn some ninja techniques from Naruto, like how to use stealth instead of just brute force all the time.
One interesting idea could be the fusion of Naruto's ninja world with the Planet Hulk concept. Maybe Naruto characters having to deal with the harsh environment of Planet Hulk. For example, Sasuke might find new and powerful opponents there that force him to adapt his Sharingan abilities in unique ways.
There could be a crossover where the Hulk's gamma - irradiated body has an unexpected reaction to the chakra in the Naruto world. Maybe his gamma energy mixes with chakra in a way that gives him new abilities or changes his appearance. This could lead to a whole new dynamic in the story, with both the Hulk and Naruto having to adapt to these changes while dealing with whatever threats come their way.
One idea could be exploring She - Hulk's life outside of her superhero duties. Maybe she has a secret hobby like painting that she uses to unwind. Another could be a story where she teams up with a lesser - known superhero and they learn from each other. For example, teaming up with a hero who has the power of invisibility but lacks confidence. They could go on a mission together and She - Hulk could help boost the other hero's self - esteem while also learning some new stealth techniques from them.
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.
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 the Hulk somehow gets transported to the DC universe. Maybe due to a freak accident involving some sort of interdimensional portal created by Lex Luthor in an attempt to bring in a powerful being to defeat Superman. The Hulk then starts rampaging through Metropolis, and Superman has to figure out how to stop him without causing too much destruction himself. He tries to reason with the Hulk at first, but when that doesn't work, he has to use his strength and speed to keep the Hulk occupied until they can find a way to send him back to his own universe.
One idea could be that the reborn character has to deal with the Hulk's uncontrollable rage in a new way. Maybe they have some special ability from their rebirth that can calm the Hulk down. For example, they can communicate with the Hulk on a deeper level, like understanding his fears that fuel the rage. Another plot idea is that the reborn character uses the Hulk's strength to protect a world that is different from the original Hulk's universe. They might face new enemies and challenges that require both the Hulk's brute force and the character's unique knowledge from their past life.
Another plot could be that Tony creates a device that can transfer intelligence. He accidentally transfers some of his own intelligence into Hulk. This causes Hulk to become more intelligent and he starts to question his own existence and role in the world. Together, they embark on a journey to find a way to reverse the process while also learning a great deal about each other.
One idea could be that She - Hulk and Daredevil team up to take on a powerful new villain in Hell's Kitchen. This villain could have some sort of ability that makes them difficult to detect, which plays to Daredevil's radar - sense and She - Hulk's brute strength.
One idea could be that the Hulk somehow gets transported to the wizarding world. He might be initially seen as a dangerous creature, but then the Hogwarts students discover his good side and he helps them fight against a new dark wizard. For example, his super strength could be used to break through dark magic barriers.