A good plot idea would be to have the Exorcist attend a spiritual retreat. There, he meets a fellow seeker who is also dealing with her own spiritual battles. They start sharing their knowledge and experiences, and as they do, they find a connection. Their mutual respect and admiration for each other's spiritual journey can turn into love.
Imagine a world where the Exorcist is injured and has to be nursed back to health by a kind - hearted healer. The healer doesn't fear his powers or his dangerous job. As she takes care of him, she also listens to his stories and fears. This nurturing environment can make the Exorcist realize his feelings for her over time. It's a slow - burn kind of love story where care and understanding are the building blocks.
Well, first, you could give the Exorcist a relatable backstory. Maybe they had a past love that was lost, and then introduce a character who has similar qualities or experiences. This might stir up old feelings and start the process of falling in love.
One plot idea could be that your OC discovers a hidden power within themselves that is connected to an ancient prophecy. They then have to figure out how to control this power while also dealing with the other exorcists who are either suspicious or jealous of them. Another idea is that a powerful demon has a special interest in your OC and is constantly trying to either turn them to the dark side or use them for some evil purpose. Your OC has to resist and find a way to defeat this demon.
One idea could be exploring the backstory of a minor character in the Blue Exorcist world. For example, you could write about the life of a lower - level demon that Rin and the others encounter. Another idea is a time - travel fanfiction where a character goes back to a crucial moment in the Blue Exorcist timeline and changes something, leading to a whole new set of events. Maybe a character gets sent to an alternate dimension where the rules of exorcism are different.
Well, for Blue Exorcist OC fanfiction, you could have a plot where your OC is a hybrid of a human and a demon. This causes a lot of internal conflict as they struggle with their identity and are feared by both sides. They try to find a place where they can belong. Another plot idea is that your OC is a master of a new form of exorcism that is not recognized by the True Cross Order. They have to fight to get their method accepted while also using it to combat a new wave of powerful demons. And then there's the idea of your OC getting caught in the middle of a power struggle between different factions within the exorcist world, having to choose a side while trying to stay true to their own beliefs.
Perhaps Issei discovers that there are exorcist families with ties to the DxD world in ways that no one suspected. He gets involved in their internal power struggles and has to choose sides while still maintaining his loyalty to his original friends. It could lead to some intense battles and moral dilemmas.
One idea could be that the main character is reincarnated as a powerful exorcist from a different era and has to adapt to the old ways of exorcising demons while still using their modern knowledge. Another could be a reincarnation where the character comes back as a demon with the memories of their past life as an exorcist, leading to an internal struggle.
One idea could be that they are thrown into an alternate dimension where the normal rules of their relationship don't apply. In this dimension, they gradually discover new feelings for each other as they face various challenges together.
One idea could be a scenario where they finally give in to their feelings during a dangerous situation. For example, when they are trapped in a supernatural force - filled place and think they might not make it out alive. The intensity of the moment makes them realize their love and they share a passionate moment.
One idea could be that they find a secret place in the opera house where they can be alone and express their love. Maybe they start with a simple dance and then their passion grows.
Another plot could be set in an alternate universe where they meet for the first time in a completely different context, like at a masquerade ball. The mystery and allure of the situation draw them together and they quickly fall in love, leading to a passionate relationship.