The OC could be a martial arts expert who runs a dojo in a rough part of town. Kaine Parker comes to her for training to improve his combat skills. As they train together, they develop a bond. Meanwhile, a powerful crime syndicate targets the dojo because of its success in the community. Kaine and the OC must fight together to protect it and their relationship deepens throughout the struggle.
One idea could be that the OC is a scientist who accidentally discovers a new power source and Kaine Parker gets involved to protect her from villains who want to steal it. Another could be the OC is a street artist and Kaine Parker stumbles upon her work and they start a relationship based on their shared view of the city. Maybe the OC has a unique ability to heal and Kaine Parker, with his often - injured state, is drawn to her for that reason.
Start by giving the OC a unique backstory. For example, if she grew up in an orphanage, it could shape her personality. Maybe she's very independent because she had to fend for herself. Then, give her some distinct physical features or quirks, like she has a scar on her cheek from a childhood accident and she always touches it when she's nervous. Also, think about her skills. Is she good at hacking? That could tie into the story with Kaine Parker in interesting ways.
A possible storyline is Kaine Parker getting accidentally transported to the Guardians' territory where Peter Quill is. Their clash of personalities, Kaine's more brooding nature against Peter's carefree space - faring attitude, could lead to some really engaging character - driven plots. They might start off as distrusting each other but then gradually form an alliance.
Maybe Peter discovers Marinette's Ladybug identity when he's in Paris on a mission. He initially mistakes her for a threat but then realizes she's a hero too. They start training together and sharing their experiences of being young superheroes. Marinette helps Peter with his stealth skills, which are useful for his Spider - Man activities, and Peter shows Marinette some new ways to use her yoyo in combat. This could lead to a romantic relationship as they grow closer through their shared superheroics.
One idea could be that the OC is a healer who stumbles upon Frankenstein's monster in the woods. The OC decides to help the monster, despite the danger, and they form an unlikely bond. This could lead to a story of redemption for the monster and a journey of self - discovery for the OC.
Maybe the OC is a scientist who has developed a device that can temporarily steal The Flash's speed. At first, the OC uses it for personal gain, but then realizes the chaos it's causing in the city. They then team up with The Flash to take down other villains who are after the device. Or, the OC could be a meta - human with the ability to see the future in flashes. The Flash initially doesn't trust the OC, but as they start to have the same visions, they have to work together to prevent a major disaster from happening.
The OC could be a psychic who is unknowingly drawn to Derry because of Pennywise's presence. Their psychic powers allow them to sense Pennywise's energy but not fully understand what it is at first. As Pennywise tries to manipulate the OC, the OC starts to fight back using their psychic abilities, creating a battle of wills and powers that could span across different dimensions within Derry, from the sewers to the abandoned houses and the mindscapes of both characters.
The OC could be a researcher studying digimon behavior. Renamon becomes the subject of the study. At first, Renamon is very guarded around the OC. However, as the OC shows genuine respect for Renamon and her kind, Renamon begins to open up. They then embark on a journey to discover more about the history of digimon, with their relationship growing stronger along the way.
Well, an interesting plot could involve an OC that is a transfer student, just like the protagonist. But this OC has a hidden past related to the Metaverse. Maybe they were experimented on by a shadowy organization in their home country, and this gives them a different perspective on the Metaverse compared to the Phantom Thieves. Their goal could be to find out who was behind those experiments and get revenge. Along the way, they form a bond with the group and learn new ways of using their powers.
One idea could be that the OC is a new Keyblade wielder who meets Ventus during his training. They start as rivals, constantly competing in battles and challenges. But as they face a powerful enemy together, they realize their combined strength and start to develop feelings for each other.
Maybe the OC is a time - traveler who accidentally lands in Obito's time. She knows about his future actions but instead of trying to stop him right away, she tries to understand his pain. This leads to a complex relationship where Obito is both intrigued and afraid of her knowledge.