A more serious plotline could be that Millianna gets into trouble with a powerful dark guild. Natsu then has to rescue her. Along the way, they discover a deeper connection between them. Maybe they find out that their pasts are somehow intertwined, and this rescue mission becomes a journey of self - discovery for both of them as well as a strengthening of their friendship.
Another plotline might involve Millianna having a crush on Natsu. She could try to get his attention in various cute and clumsy ways. This could lead to some comical situations, like accidentally getting in the way of Natsu's battles or trying to cook him a special meal that goes horribly wrong. At the same time, Natsu is just oblivious, focused on his next adventure.
One popular plotline could be Millianna and Natsu teaming up for a difficult mission. Maybe they have to infiltrate an enemy stronghold. Millianna's cat - like abilities and Natsu's fire power would make for an interesting combination. They could face challenges that require both stealth and brute force.
A lot of fanfictions focus on the idea of Natsu and Lucy being forced to work together in a tournament. They have to overcome their differences and use their combined skills to win. This often leads to a better understanding of each other. There are also plotlines where Lucy discovers a new and powerful form of her celestial magic and Natsu helps her master it. Sometimes, a prophecy about their combined destiny is revealed, which sets them on a journey to fulfill it.
One popular plotline could be Brandish and Natsu teaming up against a powerful common enemy. They might start off distrusting each other at first, but as the story progresses, they learn to respect and rely on one another. Another could be a story where Brandish has some sort of magic problem and Natsu, with his unique fire magic, helps her solve it. It could also be a story set in an alternate universe where they are on a quest together to find a powerful magical artifact that could change the fate of the Fairy Tail guild and Brandish's own people.
Well, a plot could revolve around a competition in the Fairy Tail guild where Millianna and Natsu are teamed up. At first, they don't get along well because of their different personalities. Millianna is more sly and Natsu is brash. But as they face challenges in the competition, they start to understand each other better. Maybe there's a task where they have to rescue a group of kittens, which plays to Millianna's love for cats. Natsu, on the other hand, has to use his strength to fight off the bad guys who are trying to stop them. In the end, they become closer friends and realize they make a great team.
Their relationship could start with simple friendship. Natsu might accidentally save Millianna from a small accident in the guild, like when she trips over something and he catches her. This could lead to them chatting more often. Then, as they go on missions together, they learn about each other's strengths and weaknesses. Millianna could start to admire Natsu's courage, and Natsu could be intrigued by Millianna's unique magic. Over time, this could develop into a deeper bond, like a romantic relationship where they are more protective of each other and share their innermost thoughts.
Millianna is also quite empathetic. Natsu, though he may not show it as much, has a big heart. In a fanfiction, Millianna could help Natsu understand the feelings of others better. For instance, if they encounter a sad or lost character, Millianna's empathy would lead her to comfort the character, and Natsu could learn from her example. Her more gentle nature can balance out Natsu's rough - and - tumble ways.
One unique plotline is where Juvia and Natsu accidentally swap magic powers. This leads to a lot of chaos as Juvia tries to control Natsu's fire magic and Natsu struggles with Juvia's water magic. They have to learn to adapt quickly to this new situation while also dealing with the threats that come their way.
One interesting plotline could be Natsu and Juvia teaming up for a difficult mission. They have different magic styles, Natsu with his fire magic and Juvia with her water magic. Their interaction during the mission, like Juvia being a bit shy around Natsu at first but then growing more confident as they face challenges together, can make for a great story.
One interesting plotline could be Natsu coming back with new and powerful magic. For example, he might have learned some ancient spells during his time away. Another could be his reunions with the various members of Fairy Tail. He would have emotional moments with Lucy, Happy, and the others, reminiscing about old times and looking forward to new adventures together.
One interesting plotline could be Natsu discovering new dragon powers that are unique to him. This could lead to him having to learn how to control these powers and facing challenges within the Fairy Tail guild as others may be wary or envious of his new abilities.
One possible plotline could be that Lucy uses her charm and intelligence to plan elaborate schemes to get Natsu's attention. For example, she might invite him on special adventures that are just for the two of them, where she can show off her skills and bond with him more deeply. Another could be that she gives Natsu special gifts that are meaningful to him, like a scarf she made herself which has some magical protection. Or perhaps she starts dressing in a way that she knows Natsu will find appealing, not in a vulgar way but in a way that highlights her beauty and confidence.