The owner of the supernatural restaurant could be a main character. She is a centuries - old vampire who has seen the world change but has always maintained this one special place. And there could be a detective who is investigating strange disappearances that seem to be related to the restaurant. As he digs deeper, he realizes that the world of the supernatural is far more complex than he thought.
One main character could be a werewolf who works as a bouncer at the restaurant. He has to keep the peace between the different supernatural factions that visit. Then there's a fairy who is the sommelier, choosing the perfect magical wines to go with each meal. And a young witch who comes to the restaurant to learn from the chef and ends up getting involved in all sorts of adventures within the restaurant's walls.
The main character could be a vampire daddy. He has a human daughter that he turned into a vampire at a young age to save her life. Now he has to deal with the consequences of her new existence and teach her how to survive in the vampire world.
Dean and Sam Winchester would be obvious choices as they are the main characters in the Supernatural series. Their experiences and skills would make them well - suited for the new adventures in the fanfiction.
Perhaps the supernatural restaurant is a place where humans and supernaturals come to make deals. The food served is like a form of currency. If a human wants a favor from a witch, they have to offer a meal from the restaurant that is made with rare and magical ingredients. And the restaurant has a strict code of conduct that both humans and supernaturals must follow while inside.
Maybe there's an antagonist, like a dark bender who has turned to the wrong side and uses their powers for evil. This character would create conflict for the main bender characters, constantly challenging them and trying to disrupt the balance in their world.
There could also be restaurant owners who play a major role. They might be the ones setting the goals and budgets for the'restaurant wars'. For instance, an owner who is very passionate about his restaurant's success and is constantly pushing the chef to come up with new and exciting dishes to stay ahead in the competition.
Since I don't know the specific 'Restaurant a Love Story', it could be a couple. Maybe a male chef and a female waitress.
A young and curious human who stumbles upon the world of vetalas could be a main character. They might start off as an innocent bystander but get drawn deeper into the vetala lore.
Sometimes, there are recurring characters like certain spirits or demons that the Ghostbusters keep encountering. These characters can be considered main in the sense that they drive the plot forward by constantly challenging the Ghostbusters and forcing them to come up with new strategies to deal with the supernatural.
There could also be Castiel, the angel. He often plays a significant role in fanfictions, especially when there are revelations about the supernatural world or the plans of Heaven.
The main characters are most likely to be Sam and Dean Winchester. They are the heart and soul of the 'Supernatural' series, so in the fanfiction, they would continue to be central figures, facing new challenges or coming to terms with the end of their journey.