One idea could be Naruto arriving in a world full of magic, and he has to learn to combine his chakra skills with magic. For example, he might use his Rasengan with a magical spell to create a super - powerful attack.
One idea could be that Naruto arrives in a world full of magic. He tries to understand and master the new magic system using his ninja skills as a base. For example, he might find that his chakra control can be adapted to control magical energy in a unique way.
Another plot could be that Vegeta lands in a world where time moves differently. He might age at a much faster or slower rate. This would add an extra layer of complexity as he tries to figure out how to get back to his own world while dealing with the changes in his physical state and the relationships he forms in this new world.
Maybe in this other world, Ichigo discovers a group of people who are similar to the Soul Reapers but have different powers and a unique hierarchy. He could get involved in their internal conflicts and help bring peace while also trying to find a way back to his own world.
One idea could be that America is in a world where magic exists. The government has to adapt to regulate magical powers. Another could be a world where America is the only non - technological nation and has to rely on old - fashioned ways while other countries thrive with advanced tech. And perhaps a world where America is split into multiple kingdoms and there's a power struggle between them.
One idea could be that Spider Man discovers a world where his powers work differently. For example, instead of shooting webs from his wrists, he can create them from his mind. Another plot could involve him meeting alternate versions of his loved ones, like Aunt May, who is a super - villain in this other world. Maybe he has to team up with the villains of his own world to fight against the greater evil in this new world.
One idea could be that the OC discovers they have a special power in the new world that is key to saving it from an ancient evil. For example, the power to control time, which is a very cool concept.
One idea could be that the OC discovers they have a unique power in this new world that is both a blessing and a curse. For example, they can control time but each use drains their energy severely. Another could be that the OC befriends a group of outcasts in this world and together they try to overthrow an unjust ruler.
One idea could be that in this other world, Tony Stark is a medieval blacksmith who uses his brilliant mind to create advanced weapons within the limitations of that era. He might discover a new metal ore with properties similar to vibranium and use it to make armor for the local knights.
One idea could be that the United States is transported to a world of magic. The government tries to adapt by creating a new department to study and regulate magic. For example, the military might start developing magic - based weapons.
One idea could be that Gojo Satoru arrives in a world full of magic but without his usual powers. He has to learn the new magic system from scratch and face challenges that test his wits and adaptability instead of his raw strength. Another plot could be Gojo in a post - apocalyptic other world where he uses his unique abilities to protect the remaining survivors from terrifying mutated creatures. Maybe he also has to deal with a group of antagonists who want to use his power for their own evil purposes.