Well, a really cool plot might be that the human is actually a long - lost descendant of an ancient monster - taming clan. So, when they arrive on the monster island, they start to instinctively understand the monsters in a way others can't. This could lead to them taming some of the more dangerous monsters and using them to explore the island's secrets. Also, the human could be on a quest to find a magical item on the island that is said to be able to send them back home, but they need the help of the monsters to locate it.
One idea could be a human having to form alliances with different monsters to survive a natural disaster on the island. Another could be a human using their knowledge to teach the monsters new skills in exchange for protection. Or perhaps a human discovers a hidden power within themselves while on the island and uses it to gain respect among the monsters.
There are many possibilities. For example, the human could be a scientist who is stranded on the monster island. They start studying the monsters' behavior and biology. In the process, they find a way to communicate with a group of intelligent monsters. These monsters then help the human to build a shelter and find food. Meanwhile, the human tries to figure out how to co - exist with the other, more aggressive monsters on the island. They might also try to find a way to use the unique resources on the island to create tools or defenses against the dangerous monsters.
One idea could be a human character getting lost on Monster Girl Island and having to form alliances with different monster girls to find a way back home. Each monster girl has her own unique abilities and personalities, like a mermaid - like monster girl who can help navigate the island's waterways.
One idea could be a giant monster that is actually a gentle being misunderstood by humans. A human befriends it and tries to convince others it's not a threat. For example, the monster might have been protecting a natural resource that humans unknowingly were about to destroy.
Another plot could revolve around a human who discovers they have a hidden connection to the Monster High world. Maybe they find out they are related to a monster in some way. This discovery leads them on a journey of self - discovery as they learn about their family's past and the unique heritage that comes with it. They also have to deal with the reactions of their human friends and family who might not be so accepting at first.
Perhaps a story where a group of monster girls from different parts of the island come together to protect their home from an unknown threat. A human who has some special knowledge or ability gets involved and they all have to learn to work as a team. This could involve a lot of character development as they overcome their differences and prejudices.
In a 'naruto on island fanfiction', Naruto might find himself on an island that is constantly changing its geography due to some sort of powerful and unstable ninjutsu. This would force him to constantly adapt and use his ninja skills in new ways. He could also meet a spirit or entity on the island that claims to know his destiny and he has to decide whether to trust it or not. There could be a race of people on the island who are immune to normal ninja attacks and Naruto has to learn their ways to be able to defend himself and communicate with them.
A plot could revolve around a monster girl who is trying to prove herself in the world of Monster Hunter. She befriends a human hunter, and together they face various challenges in the wild, like uncovering ancient secrets that are tied to both monster and human history. This could involve exploring forgotten ruins and deciphering old texts.
Another plot could involve the 'not - quite - human' character forming an unlikely friendship with a human. Through this relationship, they both learn about acceptance and the differences between their worlds. For example, the human could teach the non - human about things like music or art, while the non - human shows the human a different perspective on life.
One idea could be Gumball and Darwin as humans starting a new school and having to deal with the typical high - school dramas like popularity contests and bullies. Another could be the Wattersons going on a road trip as humans and the various adventures they have along the way. Maybe Gumball as a human gets a part - time job and has to balance work, school and his family life.
One idea could be a human mechanic who discovers Megatron in a damaged state and tries to repair him while hiding him from other humans and Autobots. This could lead to a complex relationship where Megatron starts to question his views on humans.
One plot idea could be human Kirby in a high school setting, dealing with normal teenage problems while also having his Kirby - like powers. For example, trying to hide his ability to inhale large objects from his classmates.