The main characters are most probably the dragon slayers, who are presumably strong and skilled in slaying dragons. Their mates are also likely to be main characters. These mates could have special abilities or characteristics of their own. Additionally, there could be supporting characters such as friends or mentors of the dragon slayers, who might play important roles in the story, for example, by giving advice on how to deal with threats to their mates or by helping in battles against those who would 'mess' with them.
I'm not sure specifically as I haven't read this particular fanfiction. But generally, it might be about characters who are dragon slayers and their mates, and perhaps some sort of warning not to cross or interfere with them.
I'm not sure specifically as it could vary a great deal. It might be about a character who is a dragon slayer and his or her mates in a fan - created fictional story. Maybe it involves some sort of conflict where others are warned not to mess with this dragon slayer and their group.
One could be 'The Dragon Slayer's Guild'. It also has a focus on dragon slayers and their relationships within a guild setting. Another might be 'Dragon Slayer's Destiny' which has elements of a dragon slayer's journey with comrades. And 'Dragon Slayer and His Allies' could also be similar as it deals with a dragon slayer and those around him.
Since I don't know the telenovela well, you can look for character lists on official TV show websites or entertainment databases. They usually list the main characters along with brief descriptions.
It's possible that there's a love interest for Percy in the fanfiction. This character could be another adventurer or someone from Percy's past. Their relationship could add an emotional aspect to the story, as Percy has to balance his feelings for this person with his dangerous job as a dragon slayer.
In some fanfictions, Happy, the flying cat, could also be an important character. He could provide comic relief and also be involved in some of Lucy's adventures as a dragon slayer. For example, he might help her find clues or get out of difficult situations. And then there could be original characters created specifically for the fanfiction. These characters could be other dragon slayers or powerful mages that interact with Lucy in different ways.
Since I don't have the actual fanfiction, it's hard to say for sure. But it's likely that the dragon slayer is a main character. There could also be other characters like villagers who are being affected by the situation related to 'the nothing' and perhaps other dragon slayers or mentors.
Typically, the main character is the dragon slayer. They are often a brave and determined individual with unique skills and a strong will.
Natsu and Lucy are quite popular. Their chemistry in the original Fairy Tail series makes it easy for fans to imagine them as mates in the fanfiction world. Another popular pairing could be Gray and Juvia, as their relationship has always had a lot of potential for further development in this type of fan - created stories.
Since I haven't read the novel, I can't say for sure who the main characters are. But it could be the person seeking payback and perhaps the ones who have wronged them.