Sora is often a popular choice. He's the main character in Kingdom Hearts, and his journey to save different worlds makes him an interesting addition to Fairy Tail - inspired stories. His ability to wield the Keyblade and his kind heart can create some great interactions with the Fairy Tail characters.
Natsu Dragneel is also very popular. His powerful fire magic and his love for adventure fit well in the Kingdom Hearts - like scenarios. He could potentially team up with Sora to fight against common enemies, and his brash personality would add a lot of energy to the story. Plus, his relationship with his guildmates in Fairy Tail can be explored further in the context of a Kingdom Hearts crossover.
A popular pairing is Sora and Lucy. Sora's kind - hearted and adventurous nature could mesh well with Lucy's intelligent and somewhat clumsy charm. They both have a strong sense of justice and are always looking to help others.
Gray is another favorite. His ice - make magic contrasts well with Natsu's fire, and his cool - headed (most of the time) nature can lead to interesting interactions. In fanfiction, he could be given new challenges related to his past or his magic, such as learning a new and more powerful form of ice - make magic.
Lucy is a very popular choice. Since she lives at Fairy Hills, there are a lot of possibilities for stories centered around her daily life there, her relationships with the other girls, and how she continues to grow as a mage.
Asuna from Negima is also quite popular. Her strong will and unique magical abilities make her a great addition to any fanfiction. She might interact with Fairy Tail characters, like teaming up with Lucy to solve a mystery.
Gray Fullbuster is also a favorite. His ice - make magic and his rivalry with Natsu are great elements to play with in fanfiction. You can write about his past and how it affects his present actions. Erza Scarlet is very popular too. Her strong - willed and fearless personality, along with her amazing combat skills and her collection of armors, make her an interesting character to base a fanfiction around. She could be on a quest to find a new and powerful armor, for example.
Natsu is definitely a popular choice. His hot - headed and powerful nature can lead to a lot of interesting situations in a school setting. For example, he might accidentally set off his fire magic during a class and cause chaos.
In Fairy Tail fanfiction, Natsu is often a popular choice. His fiery personality and powerful dragon - slayer magic make for interesting storylines. Also, Lucy with her celestial spirit magic is frequently featured. In Hellsing, Alucard is by far the most popular character in fanfiction. His overpowered abilities and complex personality draw a lot of attention. Integra is also quite popular as she is a strong and authoritative figure in the Hellsing organization.
Natsu is quite popular. His fiery personality and powerful dragon - slayer magic make for exciting stories in a medieval setting. He could be on a quest to slay an ancient dragon terrorizing a kingdom. Lucy is also a favorite. Her celestial spirit magic can be used in creative ways in a medieval fanfic, like using her spirits to help in battles against medieval - style villains. Gray is another one. His ice - make magic can be a contrast to the warm - blooded medieval battles and intrigues.
Natsu Dragneel from Fairy Tail is really popular. His hot - headed and powerful nature makes for great stories. He can easily get into fights and his loyalty to his guild is a great trait to explore. In Sabertooth, Sting Eucliffe is often a favorite. He has a cool and confident demeanor, and his rivalry with Natsu can create a lot of interesting storylines.
Lucy is also often featured. With her celestial spirit magic, she can call upon different spirits to aid in battles, adding an interesting strategic element. Plus, her character development over the series makes her a great focus.