First, know the original characters well. For example, if you're writing about Gray, remember his cool - headed nature and his habit of stripping. Then, come up with an original plot. It could be a new adventure in a different part of the Fairy Tail world.
I really like 'The Lost Guild'. In this fanfiction, the Fairy Tail guild is in a crisis when a powerful dark guild tries to steal their most precious artifact. It's full of action and the relationships between the characters are really well - written, like the friendship between Lucy and Erza.
The number of chapters in the FairyTail manga is quite substantial. It's around 500-plus. The manga keeps you engaged with its many plot twists and developments throughout these chapters.
A fairytail for wizards manga often combines elements like enchanting spells, mysterious worlds, and the growth and challenges of the wizard protagonists. The art style might be rich and detailed to bring the magical settings to life.
One idea could be to create an OC (Original Character) who has a unique multimagic ability that is related to the elements but in a different way than the existing characters in Fairytail. For example, instead of controlling fire, water, etc. directly, the OC can manipulate the energy within those elements. They could join Fairytail and face challenges that test their new abilities and their loyalty to the guild.
One popular theme is the power - up of characters. Fans like to write about how their favorite Fairy Tail characters gain new and amazing powers. Another common theme is romance. Pairing up different characters in the series in romantic relationships is quite popular.
You could have an OC who is a gamer in the real world but gets transported into the Fairytail universe. At first, they struggle to adapt but then realize that their knowledge of games can help them understand the magic system better. For instance, they might compare the different types of magic to character classes in RPGs and use this knowledge to develop their own unique magic skills.
One great Samuel OC Fairytail fanfiction could be about the OC's journey to find their true magic within the Fairy Tail guild. They might start as an outcast and slowly earn the respect of the other members through acts of great courage and kindness.
The story sees Gray Fullbuster's growth in love. He starts as a hesitant individual but eventually finds the strength to embrace love. It's a tale of self-discovery and romance within the Fairytail universe.
To develop the OC's character in a multimagic Fairytail fanfic, focus on their goals and dreams. If their magic gives them special powers, what do they want to do with it? Do they want to use it to protect the weak or gain power? Their relationships are also crucial. For instance, if they fall in love with a Fairytail member, how does that affect their actions and decisions? You can also give them flaws, like being too impulsive when using their magic, which makes them learn and grow throughout the story.