The main characters are clearly Natsu and Lucy. Natsu, with his fiery and impulsive nature, is likely to be there to encourage and sometimes push Lucy in her journey to get stronger. His dragon slayer magic might also play a role in training her or protecting her during dangerous situations.
Makarov could be her mentor. He is the master of the Fairy Tail guild and has a vast amount of magical knowledge and experience. He could guide Lucy in exploring deeper aspects of her celestial spirit magic, teaching her how to better communicate with her spirits on a more profound level, which would in turn make her stronger when summoning and using their powers.
One possible plot could be that Lucy trains intensively with Natsu by her side for support. They might go on special quests to find magical items or training methods that can enhance Lucy's power. For example, they could search for an ancient spell book that has the power to unlock new celestial spirit powers for Lucy.
Lucy could face isolation. People in the fanfiction world might avoid her, and she could be left all alone. This could also lead to her losing confidence in herself as she is constantly being blamed for something she didn't do.
Obviously, Lucy is one of the main characters since the fanfiction is centered around her getting burned. There might also be characters like her family members, such as her parents or siblings, who could play important roles in her recovery process.
One possible motive could be revenge. Another character might have a grudge against Lucy for something she did in the fictional world, like betraying a group or stealing something precious.
Yes, there might be some interpretations of such a concept in a family - friendly way. Some fanfictions might focus on the relationship development between Laxus and Lucy in a more innocent, platonic sense and then explore the idea of a family - like bond without going into inappropriate content. For example, it could be about them becoming very close friends and then taking on a parenting - like role for an orphan or something similar.
I don't know who the author of this fanfiction is. There are so many fanfiction works out there, and without more context or research, it's difficult to determine the author.
I'm not sure specifically as there could be many interpretations. It might be about a character named Lucy obtaining all 12 keys in a fictional world. Maybe these keys are magical or important items that are crucial for a certain quest or storyline within the fanfiction.
Maybe it could be about how her friends take care of her. They might bring her medicine, make her soup, and stay by her side to comfort her while she's dealing with the fever.