Well, a cool plot might be Naruto's encounter with the powerful beings in the slime world. Since he was a powerful ninja in his previous life, he could either form alliances or rivalries. He might also try to find a way back to his own world, which would involve exploring the mysteries of the slime world's magic and how it relates to the different dimensions. Maybe he'll discover that the slime world is somehow connected to the ninja world in ways he never expected.
One interesting plot could be Naruto having to adjust to his new slime form. For example, he might struggle with not having hands in the traditional sense at first but then discovers unique ways of using his slime body for combat or daily tasks. Another plot could be Naruto using his ninja knowledge in the slime world. He could teach the slimes some of his ninja techniques, like how to move stealthily or use basic chakra concepts in their own slime - based magic system.
One idea could be the main character exploring a new, hidden part of the slime world that has unique magic and creatures. For example, a place filled with sentient plants that can communicate with slimes.
One interesting plot could be the female kitsune trying to hide her true identity in the Naruto world while still using her kitsune abilities subtly. For example, she might use her enhanced senses to gather intelligence without others realizing it's not normal human perception.
The unique concept of being reincarnated as a slime is really interesting. It allows for a fresh take on the isekai genre. Also, the way the slime, Rimuru, builds his own community and kingdom is engaging.
Perhaps the reincarnated character has to face a situation where they are not fully accepted as Goku by his friends and family. They then have to prove themselves not just in terms of strength but also in terms of character, and in the process, they form new and deeper relationships with the Z - fighters.
One interesting plot could be a character reincarnated as a powerful mage in the Warcraft universe and having to navigate the complex politics between different mage factions. They might have to use their modern - world knowledge to outwit their rivals.
One interesting plot could be the dragon's struggle to adapt to its new form. For example, it might have to learn how to fly and hunt in a completely different way than it was used to in its previous life. Another plot could involve the dragon's interaction with other mythical creatures. Maybe it forms an unlikely alliance with a unicorn or has a territorial dispute with a griffin.
One interesting plot could be the reincarnated character using Gohan's latent power in unique ways. For example, they might quickly master new forms like Super Saiyan 2 and use it to protect the Earth from threats that were previously not faced in the original story. Another plot could involve the character's modern - day knowledge affecting how Gohan interacts with other characters. They could introduce new training techniques or ways of thinking to the Z - fighters.
One interesting plot could be a character reincarnated as a Pikachu and having to navigate the world of Pokemon using only Pikachu's abilities like electric shocks and agility. Another might be reincarnated as a rare Pokemon and trying to avoid being captured by trainers. Maybe also being reincarnated as a Pokemon trainer's pet and experiencing the bond from the Pokemon's perspective.
One interesting plot could be the protagonist using their modern - day knowledge to change Sakura's fate in the Naruto world. For example, they might help her become a stronger ninja earlier by introducing new training methods.
One interesting plot idea could be the slime exploring new and uncharted territories in the fantasy world. Maybe it discovers a hidden civilization of magical beings that no one else knew about.