In travel to another world fanfiction, a great concept is when a person is transported to a world that is entirely made of water. They have to adapt to breathing underwater, find food sources, and deal with underwater civilizations. Another idea is a world that exists within a dream. A character enters this world while in a coma and has to find a way to wake up by solving the mysteries of the dream world. You could also have a world where time moves backwards, and the main character has to figure out how to get back to their normal time - flowing world.
One idea could be a modern-day person accidentally stumbling into a magical world through a hidden portal in an old attic. Another could be about a group of friends who are summoned to a high - tech alien world to help save it from a great disaster. And perhaps a character travels to a world of mythical creatures like unicorns and dragons and has to learn their ways to survive.
One idea could be that Zoro ends up in a world full of magic. He has to learn to adapt his sword skills to combat magical creatures. Maybe he teams up with a local wizard who helps him understand the new world's rules while he teaches the wizard about honor in battle.
Perhaps Goku lands in a world where the inhabitants are all pacifists. He has to find a way to protect this world from an external threat without using his usual brute force, which could lead to him developing new skills. Also, he might find himself in a world with a different concept of time, which messes with his ability to power up in his usual way.
One idea could be that the Akatsuki members are transported to a world full of magic. They have to adapt their ninja skills to this new environment. For example, Sasori might find new materials to create his puppets, and Deidara could be intrigued by the different ways to create explosions in this magical world.
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.
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 the OC has unique powers from their world that are completely foreign in the new world they end up in. For example, they might be able to control time in a very different way than the native magic users. Another could be that the OC's appearance is so strange that they are initially feared or worshipped. They could also bring a new form of technology or knowledge that disrupts the existing social order.
One idea could be the US military trying to establish order in a chaotic medieval - like world. They might introduce modern military tactics and technology, like using drones for scouting in a world where the concept of flying machines for surveillance is unheard of.
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.