Well, an interesting plot could involve an OC who is a skilled artisan in the Warhammer world. This OC could be commissioned to create a powerful weapon, but during the process, they discover a dark secret about the materials or the person who commissioned it. Maybe an OC who is a diplomat trying to broker peace between two warring factions, but they face many obstacles and betrayals along the way.
Well, an interesting fanfic idea could involve an OC who is a half - elf. This OC has a natural affinity for beauty and art, which makes them a target for Slaanesh. However, they have a strong bond with their elven heritage that values purity and nature. So, they struggle between the temptations of Slaanesh and their own identity. Also, a story about an OC who is a gladiator in a Slaanesh - influenced arena. They have to fight not only for their life but also against the psychological warfare of Slaanesh's followers who try to convert them.
One idea could be a crossover of the two universes' races in a battle for a powerful, ancient artifact. For example, the Orcs from Warcraft and the Orks from Warhammer could form an uneasy alliance against a common enemy like a powerful demon lord that threatens both worlds.
One idea could be that the Annihilation Maker is a new weapon created by a mad tech - priest in the Warhammer universe. It starts to cause chaos as it has the power to disintegrate entire legions of enemy forces. But it also has a mind of its own and begins to target allies too.
A mystery - themed 'the oc fanfic' would also be great. Maybe there's a mystery surrounding the Cohen family's wealth or a long - lost relative that suddenly shows up with a hidden agenda. The characters would have to work together to solve the mystery, and in the process, their relationships would be tested and new alliances formed.
One idea could be exploring an OC's (Original Character) journey to become a leader within the 100's post - apocalyptic world. They could start as an outcast and through their unique skills, like advanced medical knowledge or exceptional hunting abilities, gain the respect of different factions.
One idea could be an Necron Overlord who rebels against the Silent King's plan. He might start to form alliances with other races in secret to gain power and knowledge. This could lead to a whole new set of power dynamics in the Warhammer universe.
An OC could be a street artist in Ikebukuro who uses their art to tell the stories of the various gangs and groups in the area. This OC could interact with Celty as they both have an interest in the unique aspects of the city. They might start a project to document Celty's presence in a positive way, which could draw the attention of the Dollars and other factions.
One idea could be that your original character (OC) is from another planet similar to Krypton. They arrive on Earth and initially clash with Superman over different approaches to protecting the planet. But as they face a common powerful enemy, they learn to work together and combine their unique powers.
A cool plot could be an OC who has the ability to communicate with Titans in a different way than the normal Seeker. Instead of using the traditional methods, they can enter the Titans' minds and see their memories. This leads to the OC finding out about a hidden danger that threatens all of Huntik, and they have to convince the other Seekers to believe them and take action.
One idea could be an OC who has the power to manipulate time. They could accidentally get stuck in a time loop during a mission with the Incredibles and have to figure out how to break free while also helping the family stop the villain.