Some fanfics might focus on the development of the male reader's character as a result of the symbiotic bond. He could become more confident or gain a new perspective on life. The story could also involve other characters' reactions to this strange new duo, which could add more layers to the plot.
First, understand the nature of the symbiote. Research about its characteristics, strengths, and weaknesses. Then, focus on the male reader's character. Develop his backstory, his personality traits, and his goals. This will help in creating a believable connection between the two.
One common theme is adventure. The story might involve the male reader and the mania character going on an exciting journey together, facing challenges and solving mysteries.
One idea could be the symbiote giving the human male some extraordinary powers, like enhanced strength and agility. The male then has to learn to control these new abilities while hiding them from the world. Another plot could involve the symbiote having a mind of its own and conflicting with the male's moral code. For example, the symbiote might want to take revenge on someone who wronged it in the past, but the male is against violence.
You can try some popular fanfic websites like Archive of Our Own (AO3). There are often a lot of different fanfics in various categories, and you might be able to find some great mania x male reader ones there.
One good aspect is the exploration of new relationships. It allows the writer to create unique interactions between the male reader character and Shantae. For example, they can go on adventures together, which can be exciting to read.
One good aspect is the exploration of a unique relationship. Since it's a fanfic with the reader inserted into the story, it allows for a very personalized experience. The reader can imagine themselves interacting with Gakupo in various scenarios.
One good aspect is the exploration of kurapika's character. In a kurapika x reader fanfic, you can see different sides of him. For example, his loyalty and determination can be shown in a new light when he is in a relationship with the reader. Also, it allows for creative interpretations of his powers and how they might be used to protect the reader.
One good aspect is the exploration of Levi's character. Fanfics can show different sides of him, like his softer side which might not be as evident in the original work. For example, in a Levi x reader fic, we might see him being more vulnerable around the reader.
One common plot element is the meet - cute. It could be at a concert, a fan - meet, or just by chance on the street. Another is the reader helping a LOONA member through a difficult time, like dealing with the pressures of idol life.
One plot idea could be that the male reader is a new trainer starting out in a region that has been affected by a strange phenomenon that is making Pokemon act out of character. He has to figure out what's causing it and stop it while building his own team of Pokemon. Another idea is that the male reader discovers a hidden Pokemon species that is thought to be extinct and has to protect it from poachers.