A really interesting plot would be if there was a prophecy about Freed and Laxus having to team up to save the Fairy Tail guild from an internal threat. They would have to face their own insecurities and past mistakes while trying to figure out who the traitor in the guild is. Along the way, they would strengthen their bond and prove their loyalty to Fairy Tail.
There might be a fanfiction where Laxus and Freed are involved in a magical competition within the Fairy Tail guild. They compete against other teams and have to overcome various challenges. This could show their growth as mages and how their relationship evolves during the competition, with them learning more about each other's strengths and weaknesses.
One idea could be that Freed and Rufus team up for a secret mission in the Fairy Tail guild. Maybe they have to find a lost magical artifact that has the power to change the balance of magic in the world. They could face various challenges along the way, like dealing with rival guilds who also want the artifact.
A plot could involve Freed accidentally casting a spell that links his and Lucy's minds. At first, it's a chaotic mess as they have to deal with suddenly sharing thoughts and feelings. But as time goes on, they start to understand each other on a deeper level. They use this newfound connection to uncover a plot within the Fairy Tail guild by a group of mages who are trying to undermine the guild's leadership, and in the process, their relationship blossoms.
One idea could be a story where Mira and Laxus are paired on a difficult mission. They start off bickering as they have different approaches, but as the mission progresses, they begin to understand and respect each other more. This could lead to a budding romance as they see the good in one another.
There is a fanfiction called 'Laxus and Freed's New Adventure' which is really good. It focuses on their journey to explore an ancient magical ruin. They discover new spells and secrets about their magic during this adventure.
A plot could involve Fem Natsu accidentally using her magic in a way that affects Laxus in an unexpected manner. For example, her fire magic could trigger some latent power in Laxus, and as they figure out what's going on, they become closer. This could also lead to some interesting training sessions between them as they try to control this newfound power connection.
A plot could involve a magic competition in the Fairy Tail guild. Mirajane and Freed both enter. Mirajane wants to show off her new transformation magic, and Freed aims to prove the power of his rune magic. As they compete, they start to learn from each other. Mirajane might pick up on Freed's precise and calculated approach to magic, while Freed could be inspired by Mirajane's bold and fearless use of her powers. This could lead to a friendly rivalry that also strengthens their bond within the guild.
There's also 'The Rune Mage and the Lightning Dragon'. In this fanfiction, it delves deep into their past, revealing some hidden secrets that bring them closer. It has some really well - written emotional scenes between Freed and Laxus that make you feel for their characters.
Perhaps she decides to go on a solo adventure to find out more about her family's past. This journey takes her to far - off lands where she meets different characters and has to overcome various challenges. When she returns to Fairy Tail, she has new knowledge and experiences that change the way she interacts with the guild and especially with Laxus.
In a crossover with 'One Piece', they could be paired with Luffy. Luffy's carefree and determined nature would contrast well with Freed and Laxus. They could all be on a quest to find a magical treasure that has power over both their worlds. Luffy's Gum - Gum powers would be interesting to see alongside Freed's rune magic and Laxus' lightning.