Erza is an interesting character to focus on in a Fairy Tail Christmas OVA fanfiction. She could enforce strict Christmas traditions at the guild, like making sure everyone has a proper gift for the gift - exchange. And her strong leadership skills would come in handy when the guild faces any problems during the Christmas celebrations, like dealing with unruly visitors or handling a shortage of food for the Christmas feast.
Natsu is always a great choice. His fiery personality and powerful dragon - slayer magic can create a lot of action - packed scenes. He's also very impulsive, which can lead to some interesting situations at the camp, like accidentally starting a small fire during a training exercise.
Lucy is also a good character to focus on. She has a complex backstory with her family and the celestial spirits. You can explore her growth as a mage, how she becomes stronger in controlling her spirits and her relationships within the team. For example, her friendship with Natsu and how they support each other in battles. Plus, the whole aspect of the celestial spirit world is full of potential for interesting plotlines.
One idea could be that the Fairy Tail guild decides to put on a special Christmas play. Each member has to take on a role, like Natsu could be a clumsy Santa Claus. They struggle with rehearsals but in the end, it's a huge success and spreads the Christmas spirit throughout Magnolia.
Ben Tennyson himself is a great choice. His ability to transform into different aliens offers a lot of potential for interesting interactions with the magic of Fairy Tail. For example, how would his Heatblast form interact with a fire - using mage from Fairy Tail? It could be a really cool dynamic.
Natsu is a very popular character to focus on. His hot - headed and powerful nature can lead to all kinds of exciting storylines. Lucy is also a great choice. Her celestial spirit magic provides a lot of opportunities for different types of adventures, like exploring different spirit realms. And of course, Gray is popular too. His ice - make magic and his cool (pun intended) personality can be really fun to write about.
Erza is extremely popular. Her strong - willed and powerful nature means there are countless stories that can be told about her. Maybe she has to face an opponent who can nullify her magic, and she has to find a new way to fight. Juvia is also a fan - favorite. Stories about her unrequited love for Gray and her growth as a mage are always interesting. And of course, Happy, Natsu's sidekick, can add a lot of humor to any fanfiction.
Mavis is definitely a popular choice. Her unique powers and her role in founding the guild make her a central figure. Zeref is also often focused on, given his connection to Mavis and his powerful and mysterious nature. Then there's Precht, as he was an important part of the early guild and his actions had a significant impact on the future of 'Fairy Tail'.
Gray is also popular. Fanfiction could expand on his backstory with Ur and how his ice - make magic could be developed in new and unexpected ways. Maybe he discovers a new form of ice - make that's even more powerful.
Erza is often a popular character to focus on. Her strong will and past connection to the Tower of Heaven make her a central figure. Fans like to explore her growth during the events of the tower, as well as her emotional turmoil regarding Jellal. Another popular character is Jellal himself. His complex character, being both a villain and a victim in the Tower of Heaven arc, offers a lot of room for exploration in fanfiction. Gray is also a favorite. His cool - headedness during the battles in the tower and his relationship with his friends, especially Natsu, can be further developed in fan - created stories.
Natsu is always an interesting character to focus on. His determination and his unique fire - based magic can lead to some exciting adventures on Tenrou Island. He could be on a quest to find a powerful fire - related relic hidden on the island. Another great character is Lucy. Her celestial spirit magic can add a different dimension to the story. She might use her spirits to help her and her friends navigate the dangerous parts of Tenrou Island or solve mysteries there.