Another aspect could be inventory management. In a game, players have an inventory to store items. In Fairy Tail, characters could have a magical inventory. They could collect items during their adventures, like rare magical crystals or ancient spell books. The gamer ability would govern how much they can carry, how they can use these items in battles or for other purposes, and how they can upgrade their inventory space over time.
Another way is to have the gamer abilities be a key factor in a guild - wide competition. The OC's unique abilities can create interesting scenarios and rivalries. Say the OC has the ability to 'Double XP Gain'. Other guild members might be jealous or want to team up with them. This can lead to various sub - plots about friendship, betrayal, and cooperation within the guild.
One idea could be a character with the gamer ability to 'Pause Reality'. This would allow them to freeze time in battle, analyze the situation, and then make their move. It's like having a strategic advantage similar to pausing a game to plan your next steps.
Maybe there's a glitch in the gamer ability system in the Fairy Tail world. This causes all the magic to go haywire. For example, spells start to backfire or have unexpected effects. The Fairy Tail mages have to figure out how to fix this glitch while dealing with the chaos it causes. It could lead to some really funny and exciting situations, like Gray accidentally freezing himself every time he tries to use his magic because of the glitch.
One unique feature is the integration of gaming mechanics. In these fanfictions, characters often have things like experience points, leveling systems, and skill trees, which are not present in the original Fairy Tail. For example, a character might gain levels by completing quests in the Fairy Tail world, just like in a game.
First, focus on their gaming skills. Decide what kind of games they are good at, like RPGs or action - shooters. If they are good at RPGs, they might be great at strategizing in Fairy Tail battles. Then, think about how their love for gaming affects their personality. Maybe they are a bit of a loner like some gamers, but find a sense of community in the Fairy Tail guild.
Perhaps a character from Fullmetal Alchemist somehow ends up in the Fairy Tail world. They could then teach some of the Fairy Tail mages about alchemy. This would require adapting the alchemical concepts to fit within the magic - based system of Fairy Tail. They might find similarities between the two, like how both alchemy and magic require a certain level of knowledge and skill to be effective.
One way could be through a magical portal. Maybe a portal opens between the Naruto world and the Fairy Tail world, and the knowledge of Hiraishin spreads in Fairy Tail. Another way is if a Fairy Tail mage somehow travels to the Naruto world, learns the Hiraishin, and brings it back.
In fanfiction, the Mangekyou Sharingan's unique abilities like Amaterasu (the black flames) could be combined with Fairy Tail's elemental magics. Imagine a character using Amaterasu - like flames in combination with fire - based Fairy Tail magic to create an even more powerful and destructive attack.
One way could be by having Gogeta arrive in the Fairy Tail world through a magical portal. Maybe he's on a quest in his own universe and gets accidentally transported to the Fairy Tail realm. He could then interact with the Fairy Tail guild members, perhaps even joining them on some of their adventures and using his unique powers to help out.
One interesting concept could be the unique power-ups that the characters might get in a gamer - like setting. For example, they could level up their magic skills in a more numerical and visible way, similar to how characters in a game gain experience points.