You could write a fanfiction about a monster girl oc who is an outcast in her own kind's society. Maybe she has a unique power or appearance that makes the others shun her. A human befriends her and together they embark on a journey to prove that she is not a danger but rather an asset to both the monster girl world and the human world. This would involve a lot of character development and exploration of themes like acceptance and prejudice.
One idea could be to create an OC who is a half - human, half - monster girl trying to find her place in a world that fears her kind. She could go on a journey to prove that she's not a threat.
Give her a distinct appearance. For example, if she's a cat - like monster girl, don't just make her a typical cat girl. Maybe she has multiple tails or unusual markings. Her personality is also key. Make her have quirks like being extremely shy but very brave when it comes to protecting her friends.
Strength can be a great trait. A strong monster OC can be physically powerful, able to protect or cause destruction depending on its nature. Another good trait is intelligence. A smart monster OC can outwit its enemies or solve complex problems. And kindness is also a wonderful trait. A kind monster OC in a world full of fear towards monsters can be a unique and interesting character as it tries to show others that not all monsters are bad.
First, think about the physical appearance. Is she a cute cat - girl with big ears and a tail? Or a more intimidating dragon - girl? Then consider her personality. Is she shy, outgoing, or fierce? For example, if she's a mermaid - girl, she might be gentle and curious about the land - dwelling creatures.
There could be a kitsune - like monster girl, with her fox - like features and tricky nature. Another might be a lamia, half - snake half - human, who could have unique abilities related to snakes, like venom or constriction. And perhaps a mermaid - type monster girl, who could bring in the element of water and her own underwater world lore.
First, create a unique OC. Think about their species, appearance, and personality. For example, if they're a werewolf, what makes them different from other werewolves? Then, place them in the Monster High setting. Consider how they'll interact with the existing characters. Maybe your OC is really shy and has trouble making friends with the outgoing ghouls.
One great 'oc Monster High Fanfiction' is 'The New Ghoul in School'. It has an interesting OC who is a half - vampire, half - mermaid. The story focuses on how she tries to fit into the Monster High environment. Another one could be 'OC's Mysterious Arrival' which has a lot of mystery and adventure as the OC arrives with a strange past.
An engaging plot could involve the monster OC having a goal that the heroes initially misunderstand. For example, the monster is actually trying to protect a certain area from a greater threat, but the heroes think it's attacking. As the story progresses, the truth is revealed. Along the way, there can be epic battles where the heroes learn more about the monster's powers and weaknesses.
Leon S. Kennedy could be a potential ally. He's experienced in dealing with the RE monsters and has a strong sense of justice. He might see the oc as a valuable asset in the fight against the bio - threats and offer his protection and guidance.