Give them a distinct backstory related to their original world. For example, if they're from a world where magic is feared, they might be more cautious in a new world full of magic.
You can make their abilities or skills unique. Maybe they have a special power from their home world that no one in the new world has. For instance, a character from a world of sound can manipulate sound waves in ways the new world's inhabitants can't even imagine. This not only makes them stand out but also gives them an edge in various situations. They could also have a unique appearance, like having skin that glows in the dark which is normal in their home world but strange in the new one.
To create unique characters in this type of fanfiction, consider their motivation for traveling to the new world. If they're seeking revenge for something that happened in their old world, it will color their actions in the new world. Also, their cultural background from their original world can play a big role. A character from a highly hierarchical society might struggle with the more egalitarian nature of the new world, and this internal conflict can make them a very interesting and unique character.
Develop characters with complex backstories that tie into the facade idea. A character might have had a bad experience with a Pokemon using a facade to deceive them in the past, and now they are overly cautious or even distrustful of Pokemon. This backstory can influence their actions and relationships in the fanfiction, making them unique.
Create characters with complex backstories. A mermaid - like Pokemon might have been experimented on by an evil scientist in the past, which gives it a dark side but also a strong will to protect others from the same fate. You can also play with their physical appearance. Maybe a mermaid Pokemon has a unique color pattern or extra fins that no other Pokemon has. This not only makes it look different but also can be tied into its personality or abilities.
You can give your characters unique backstories. For example, a trainer who was once bitten by a werewolf - like Pokemon and has since been shunned by society, but still has a strong bond with their Pokemon. This backstory can shape their personality and actions throughout the fanfiction.
A unique character could be a lemon - themed magician who teams up with Superboy. The magician can use lemon - scented smoke to perform illusions and also has real magical powers like teleportation, but only to places where there are lemon trees. They meet Superboy when a common enemy is stealing all the lemons in the city to use for some evil plan.
You can give them unique backgrounds. For example, a trainer who grew up in a family of pokemon poachers but decides to go against the family tradition and become an ethical trainer. This backstory can shape their personality and goals in the story.
Give them different motives regarding the love potion. For instance, one character might want to use it to get revenge on an ex - lover by making them fall for someone they hate. This would make the character complex and unique.
Mix up the occupations. Have a human who is a professional athlete in Zootopia. Since the animals there have different physical abilities, the human has to find a way to compete. They might team up with an animal coach, like a cheetah, who helps them train to be faster. This creates a unique dynamic and a character that stands out in the fanfiction.
Authors create unique characters in the Reborn into the Pokemon World Fanfiction in many ways. One is by giving them a strong motivation that is different from the usual. For example, a character whose main goal is to find a way to make all Pokemon communicate freely with each other. They can also make characters with a moral code that is not typical in the Pokemon world. Maybe a character who refuses to capture Pokemon and only befriends them. And by making characters with unique fashion styles, like wearing clothes made from Pokemon materials, they can also make them stand out.
You can give them unique magical abilities related to serpents. For example, a character could have the ability to communicate with snakes not just in Parseltongue but also understand their emotions and memories. This would set them apart from other characters in the fanfiction.
You can create a character who is a double agent. They pretend to be a loyal member of Team Galactic but are actually working for the good side. This adds an element of mystery and intrigue.