One possibility is that they get into some comical situations. Natsu might accidentally set off Laxus' temper with his carefree attitude, but then they quickly make up. They could also have a friendly competition within the guild, like a race or a magic - using contest, which would not only be fun for them but also a great entertainment for the other guild members.
Character development is key. In a good fanfiction, we would see Natsu become more responsible as he is influenced by Laxus' more serious nature, and Laxus could become more open - hearted and friendly under Natsu's influence. There should also be some emotional moments, like when one of them is in danger and the other risks everything to save them. This would really show the depth of their friendship.
In such fanfiction, Natsu might be depicted as more passionate and impulsive than in the original work. His fiery nature could be emphasized in a romantic or more intense context. Laxus, on the other hand, may be shown as more brooding and powerful. His strength and dominance could be a key part of the relationship dynamic in the fanfiction.
They could have a friendly competition. Naruto challenges Shino to a race through the forest. Naruto uses his speed and agility, but Shino uses his knowledge of the forest and his bugs to find shortcuts. In the end, they both realize that the competition was more about having fun together than winning.
Their friendship could lead to some interesting team - ups in Quidditch. Neville might not be the best flyer, but he could be the strategist for Harry. Harry, on the other hand, could execute Neville's plans on the broomstick. This would not only strengthen their bond but also show how their different skills can complement each other.
Well, one possibility is that Gildarts could share some of his powerful magic techniques with Natsu. Since Gildarts is a very experienced wizard, he might see the potential in Natsu and offer some tips on how to better control his fire magic, which is similar to Igneel's. Maybe he could also tell Natsu some stories about his own adventures that would inspire Natsu to become even stronger.
One common theme is friendship. They often start as just acquaintances or even rivals and then develop a deep friendship. Another theme is growth. Both characters, especially female Natsu, grow in terms of their powers and personalities. For example, in many fanfictions, female Natsu learns to control her new - found abilities better with Laxus' help.
Perhaps they get involved in a mystery within Konoha. Some important ninja artifacts are missing, and they suspect an inside job. As they investigate, they have to use their wits and skills. Naruto uses his ability to make friends easily to gather information, while Rock Lee uses his stealth and taijutsu to track down potential suspects. Their friendship is put to the test as they face danger and deception.
He could also face challenges within his own guild. Some of the members might tease him, while others might be overly protective. Natsu as a girl would have to navigate through these new social dynamics. Also, his appearance as a girl might attract unwanted attention from some villains who see him as an easier target, but he would prove them wrong with his strength.
Well, in this kind of fanfiction, Natsu might teach his apprentice about magic. He could pass on his unique fire - based magic skills, like how to control the intensity of the flames. And they might go on adventures together, facing various challenges and enemies. Maybe the apprentice has some special abilities that Natsu has to help develop.
It's possible that Natsu's coldness is a temporary state. He could be under a spell that makes him seem cold, but deep down his true self is still there. As the story progresses, his friends might try to break the spell and bring back the old Natsu. They could search for a cure or a way to reverse the magic, leading to many adventures and challenges along the way.