The OC master could be a hermit who has been living in isolation for years, developing a unique understanding of the Force. He or she might have witnessed the downfall of the Jedi Order in the past and wants to prevent Anakin from making the same mistakes.
Perhaps the OC master is a non - humanoid alien from a far - flung planet. This species has a natural affinity for the Force in a different way than humans. The master comes to Anakin after sensing his powerful connection to the Force and decides to train him, believing that Anakin can bridge the gap between their two cultures and bring about a new era of peace and understanding in the galaxy.
The plot might involve Anakin learning unique combat techniques from the OC (Original Character) master. This could lead to him developing new skills that set him apart in the Star Wars universe, perhaps changing the course of some of the events we know.
The setting could be a major element. It might be set in a different time or place compared to the original Star Wars universe. Maybe it's during a period of relative peace, and the training is more about self - discovery for Anakin rather than combat - oriented. Also, the powers and abilities that the OC imparts to Anakin can be important. It could be new Force techniques or ways of thinking about the Force that we haven't seen before in the official stories.
Perhaps it's a non - Force - sensitive character who has skills in other areas that are important in the Star Wars universe. For example, a great pilot or a brilliant strategist. This person could be getting more attention or praise than Anakin in certain situations, and thus be seen as a rival.
One possible different master for Anakin in fanfic could be Qui - Gon Jinn. Qui - Gon was always one to follow his instincts and was more in tune with the Living Force. He might have been able to handle Anakin's powerful emotions better than Obi - Wan. He was also more willing to question the Jedi Council, which could have influenced Anakin in a positive way, making him less likely to feel oppressed by the Council's rules.
A powerful Nightsister could be a great OC. The Nightsisters have their own connection to the dark side of the Force. An OC Nightsister could use her magic and knowledge of the dark side to interact with Anakin. She might offer him new ways to use the Force, like some of the unique spells and abilities that Nightsisters possess.
A powerful and rogue ninja who has also mastered some dark seal arts could be a great antagonist. He might be jealous of the OC Seal Master's natural talent and pure intentions with seals, and tries to steal their techniques or stop them from achieving their goals. For example, he could be creating cursed seals that are causing chaos in the ninja world.
In the official Star Wars story, Anakin is trained mainly by the Jedi Order, with Obi - Wan as his master. But in 'anakin trained by oc fanfiction', it's an original character doing the training. This OC can bring in new ideas and training methods that are not part of the Jedi curriculum. For example, the OC might focus on Anakin's emotional side more, which the Jedi usually suppress.
It could be a new character created by the author, like a young kunoichi from a small, far - away village. She might have special powers related to nature, like the ability to communicate with animals. This would make for an interesting dynamic when babysitting Naruto, as he's always been curious about different ninja abilities.
The OC could be a mysterious ninja from a far - off land. Sasuke might think this ninja has some secret knowledge about the Uchiha clan that he wants, so he kidnaps them.
The OC could be an outcast in the ninja world. They don't belong to any major clan and are constantly on the move. Hidan might see this OC as an easy target. The OC might have some unique skills, like being able to communicate with animals, but these skills are not enough to protect them from Hidan when he decides to sacrifice them for his own dark purposes.