It could be an ancient evil entity that has been sealed away for centuries. The OC's rebirth somehow disturbs the seal, and this entity awakens. It views the Fairy Tail guild as a threat because of their positive influence in the world. So, it starts to target the guild, and especially the OC, as they are a new and unknown factor in the fight against it.
Well, perhaps the OC is reborn into Fairy Tail as a child who has the power to communicate with spirits in a different way than Lucy. This new ability could attract the attention of the guild. As they grow up in the guild, they learn about friendship and loyalty. They might face challenges from other dark guilds who want to use their special power for evil. Through the help of their Fairy Tail friends, they overcome these difficulties and become a key member of the guild.
The OC could be reborn with a special connection to a long - lost magical artifact in the Fairy Tail world. Maybe they are the key to unlocking its true power. In their journey, they have to learn about the history of Fairy Tail and the artifact while also dealing with the jealousy and suspicion of some guild members who don't trust this new, unknown person. Eventually, they prove their worth and use the artifact to save the guild from a great danger, like an ancient evil that has been awakened.
A powerful dark mage who was once a member of Fairy Tail but was banished for using forbidden magic. This mage now wants revenge on the guild and sees the reborn OC as a threat to his plans. He has the ability to control shadows and can create illusions to deceive the members of Fairy Tail.
The OC's reincarnation can have a huge impact. If they are reincarnated as a new member, they can bring fresh perspectives to the relationships. For example, they might befriend characters who were previously on the outskirts of the guild. If reincarnated as an existing character's relative, it can strengthen or complicate family - like relationships. They could also introduce new rivalries if they have different beliefs or goals compared to other members.
There could be a deeper interaction where the OC's Sharingan actually evolves due to exposure to Fairy Tail magic. Maybe the strong magical energy in the Fairy Tail world causes the Sharingan to gain new abilities, like being able to see the future more clearly in magical battles or being able to sense the presence of hidden magical items. This would create an exciting development in the fanfiction as the OC discovers and masters these new powers.
He could be the new rising star. He might start off as a bit of an outcast because he's new and has different ways of doing things. But as he shows his strength and loyalty, he quickly becomes an important member. For example, he could be the one to solve a really difficult mission that the guild has been struggling with, earning everyone's respect.
In the Fairy Tail universe, an OC named Kai was a skilled swordsman. He had been on many adventures with the guild members. But during a battle against a horde of demons, Kai was fatally wounded. His friends brought his body back to the guild. For his funeral, the guild hall was decorated with his favorite things - swords and old maps. Lucy wrote a poem in his memory and read it aloud. Happy flew around sadly, chirping softly. The members dug a grave near the guild's special tree. As they laid Kai to rest, they all made a vow to continue fighting for justice, just as Kai would have wanted.
Samuel Oc is an original character created for Fairy Tail fanfictions. He's a character that doesn't exist in the original Fairy Tail series but is made up by fans to add new storylines and perspectives to the Fairy Tail universe.
Making the oc stand out in the Fairy Tail universe can be achieved in multiple ways. Firstly, their magical power source can be unique. For example, if most characters draw magic from within themselves or from natural elements, the oc could draw magic from dreams or emotions. Secondly, their role in the guild can be special. Instead of being a typical fighter or mage, they could be a healer with a combat - ready side. Thirdly, the oc's character development can be different. They could start as a very shy and reserved character and slowly transform into a confident and assertive leader within the Fairy Tail guild, which is a journey not often seen in the original characters.