Well, for character creation in this RWBY OC with Fairy Tail system fanfiction, you could start with the RWBY aspect. Consider giving your OC a unique weapon, like a scythe that can transform into a ranged weapon, similar to Ruby's Crescent Rose. For the Fairy Tail system, think about what kind of magic your character would have. Maybe they could have ice - make magic like Gray from Fairy Tail, but with a RWBY - style twist, like the ice being infused with Dust. Also, think about their backstory. Were they from Vale and somehow got exposed to the Fairy Tail magic system? This could lead to some interesting plotlines where they have to keep their magic a secret among the RWBY characters or use it to their advantage in battles against Grimm.
For creating a Celestial Wizard OC in Fairy Tail fanfiction, first consider their celestial spirits. They could have unique spirits, like a phoenix spirit for fire - related magic. Also, think about their backstory. Maybe they come from a small village where celestial magic was once shunned. Their personality could be shy yet determined, and their goal in the Fairy Tail guild could be to prove the worth of celestial magic.
An engaging plot could involve the integration of the two systems. For instance, the Fairy Tail system is starting to seep into the RWBY world, causing chaos. Your RWBY OC has to figure out how to stop it while also learning more about their own powers. Along the way, they meet different RWBY characters who either help or hinder them. You can add some mystery, like there's a hidden connection between the most powerful Grimm and the source of the Fairy Tail magic in this world. As the plot progresses, your OC's growth in both their RWBY abilities and Fairy Tail magic should be a central focus, and they should face challenges that test both aspects of their power.
One idea could be creating an OC who has a unique magic power related to time manipulation. They could use it to go back in time and prevent a major disaster in the Fairy Tail world. Another idea is an OC that is a hybrid of a human and a mythical creature, like a half - dragon. This would give them interesting abilities and a different perspective in the story.
The OC could have a special item or ability that allows them to absorb magic. Maybe it's a family heirloom or a unique power passed down through generations. In the fanfiction, this could be explored as the OC discovers the origin and true potential of their ability. They could then use this power to help their Fairy Tail comrades in battles, perhaps by absorbing the magic of enemies and using it against them.
For a male OC in Fairy Tail fanfiction, start with his appearance. He could have spiky blue hair and a scar on his cheek to give him a tough look. His clothing might be a combination of traditional Fairy Tail - style robes and some unique accessories like a magical amulet.
One idea could be creating an OC who has a unique magic related to the elements but in a very different way from the existing characters. For example, an OC that can manipulate the emotions associated with elements rather than the elements themselves. This could lead to some really interesting interactions during the GMG as they might be able to influence the performance of other competitors by affecting their emotional state related to their magic.
One idea could be an OC inventor who creates unique magical items inspired by nature. For example, a device that can harness the power of lightning storms. Another idea is an OC inventor who specializes in creating gadgets to enhance a wizard's existing magic, like a bracelet that amplifies fire magic. Or an OC who invents a machine that can detect hidden magic in objects or people.
One idea could be an OC dragon slayer who has the power of a rare and ancient dragon. Their magic could have unique side - effects or abilities that no one has seen before. For example, instead of just breathing fire like a typical fire dragon slayer, they could create a special type of fire that can heal as well as destroy.
A great idea for a Fairy Tail OC Crossover Fanfiction is to cross your OC with characters from the world of One Piece. Imagine your Fairy Tail OC with their unique magic abilities on a pirate ship, sailing the Grand Line. They could have battles with the Devil Fruit users, using their magic to counter the strange powers. Or, consider a crossover with the world of Bleach. Your OC could end up in Soul Society and learn about the different forms of spiritual power there while also showing off their Fairy Tail magic. Maybe they could even form a team with some of the Soul Reapers to fight a common enemy.
You could also make an OC beast that has a special connection with the Celestial Spirits. Maybe it was once a spirit itself but got transformed into a beast. This connection could lead to interesting storylines involving the Celestial Spirit World and the regular Fairy Tail world.