He could marry an original character created specifically for the fanfiction. This character could be a powerful mage from a far - off place who crosses paths with Natsu during one of his adventures.
In a 'natsu gets married fanfiction', perhaps Natsu meets a new character who he falls deeply in love with at first sight. This new person might be from a different land. Natsu has to learn about her culture and traditions in order to marry her. His friends from the guild are initially skeptical but then come to support him wholeheartedly as they see how much he cares for this person.
One of the senior and more experienced members of the guild. They have seen a lot and know how things should be done in the guild. If Natsu acts in a way that goes against their long - established ways, they would not hesitate to berate him.
It could be Gray. Although they are friends most of the time, in a fanfiction, there could be a plot twist where Gray's envy of Natsu's abilities gets the better of him, and he betrays Natsu. Maybe Gray thinks that by getting rid of Natsu, he can be the top mage in their guild.
Natsu might be initially shocked and confused. He's not the type to expect rejection, so he could be at a loss for words at first. For instance, he might just stand there with his mouth open, not believing what he just heard.
Well, in many fanfictions, Natsu might initially be in shock. He's a passionate character, so he could react with anger. He might lash out at Lisanna or the person she cheated with. He could also go into a state of self - doubt, wondering what he did wrong.
Natsu could handle the rejection by using it as motivation. He might train harder to prove himself to those who rejected him. For example, if he was rejected from a magic competition, he could practice new spells and techniques to show up the judges next time.
One possible fanfiction could be that Natsu and Mavis get married in a simple yet magical ceremony. Their friends from Fairy Tail are all present, and the guild hall is decorated with beautiful flowers. Natsu is nervous but excited, and Mavis looks stunning in her white dress. After the wedding, they embark on a journey together to explore new lands and discover hidden magic, all while growing closer as a married couple.
In this fanfiction, Natsu and Mavis' married future could be one where they build a small cottage near the guild. They have a peaceful life, with Natsu going on occasional guild missions while Mavis stays back to tend to their home and garden. Their days are filled with simple joys like cooking together and sharing stories by the fireplace at night.