The OC could be a character with a mysterious past. Maybe they have a hidden power that they are not fully aware of. Natsu, Mirajane, and Erza sense this mystery and are drawn to help the OC uncover their past. As they dig deeper, they find that the OC has a connection to an ancient magic that was thought to be lost. This discovery not only changes the OC's understanding of themselves but also has a significant impact on the relationships within the group.
Perhaps the OC is from a different dimension where magic works in a strange way. Natsu, Mirajane, and Erza are intrigued by this. They team up to help the OC understand and control their magic in the world they are in now. Along the way, they encounter a powerful dark wizard who wants to use the OC's unique magic for evil. So, they have to fight together to protect the OC and the world from this threat.
There's also 'Unlikely Allies' which is set during a war against a powerful dark guild. In this story, Natsu, Mirajane, and Erza form an unbreakable alliance, and their individual powers and personalities blend together to defeat the enemy. It has great action scenes and character development.
One possible storyline could be a quest where the three of them have to work together to defeat a powerful dark wizard. Natsu's brute strength, Erza's strategic combat skills, and Mirajane's shape - shifting abilities would make for an amazing team. They could start off with some initial bickering due to their different personalities but gradually grow to respect and rely on each other more as the adventure progresses.
One idea could be a story where they go on a quest together. Maybe they have to find a rare magical item. Natsu's impulsiveness, Mirajane's charm, and Erza's strict leadership combine in interesting ways during the adventure.
Show their growth as individuals as well. Maybe the OC is trying to overcome a fear, and Mirajane offers support. This mutual support system is a key part of a realistic relationship. Also, don't rush into the romantic part. Let their friendship develop first. They could share inside jokes, or have a special place in the guild where they always meet. This way, the relationship evolves organically. Another important aspect is conflict. They might have disagreements about how to handle a guild situation, but they work through it, which strengthens their bond.
One unique way to develop their relationship could be through a shared loss. For example, if a beloved member of the guild was killed. Natsu might react impulsively with anger, Erza would be more stoic but determined for justice, and Mirajane would be the one to comfort them both while also being sad herself. This common grief could bring them closer together, with Natsu realizing he can rely on the two women in different ways. Erza could see Natsu's softer side and Mirajane could see a new depth to Erza.
To make the OC stand out, give them a strong moral code that is different from the norm at Hogwarts. Maybe they believe in absolute non - violence in all situations, which would be quite unique in a school where hexes are sometimes used casually. Their family background can also play a role. If they come from a family of magical healers but they have a natural inclination towards chaos magic, it creates an interesting contrast. Also, their speech pattern can be unique. They could use archaic magical terms that no one else uses, making them seem like a walking magical encyclopedia.
Common themes include self - discovery. Naruto, Erza, and Mirajane all have their own pasts and issues. In these fanfictions, they often help each other grow and understand themselves better. And of course, there's the overarching theme of adventure. Combining the two fictional universes gives a lot of scope for exciting adventures where they battle villains, explore new places, and uncover secrets.
Yes, there are quite a few out there. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'naruto x erza x mirajane' and you'll likely find a variety of stories with different plotlines, from adventures that combine the unique worlds of Naruto, Fairy Tail (where Erza and Mirajane are from), to more character - centered stories exploring their relationships.
First, create a well - developed OC. Decide on their appearance, personality, and backstory. For example, if your OC is a shy but talented mage, it can lead to interesting interactions with Erza. Then, think about the plot. It could start with the OC meeting Erza in a dangerous situation and then build from there. Keep in mind the relationship dynamics between them and how they will grow throughout the story.