Well, she could have adventures like encountering powerful enemies with Mavis' knowledge guiding her or going on quests to restore balance in the magical world of Fairy Tail. There could also be moments of self-discovery and growth as she navigates through these challenges.
Imagine an adventure where they are sent to the past. They have to ensure that an important event in Fairy Tail's history happens correctly. Lucy and Loki have to blend in with the past guild members without changing too much. This involves Loki having to hide his modern magic tricks and Lucy having to be careful with summoning her celestial spirits so as not to arouse suspicion.
They could go on a quest to find a lost magical crystal. Naruto's tracking skills as a ninja and Sayla's knowledge of the Fairy Tail world's magic locations would be useful. Along the way, they might encounter various magical creatures and have to fight them using Naruto's jutsu and Sayla's magic.
Well, in many fanfictions, their relationship might start with Natsu being a bit in awe of Mavis as she is a very important figure in Fairy Tail's history. Natsu, being his brash self, might initially make mistakes around her but gradually learns from her wisdom. As time goes on, he could come to respect her even more deeply and they might form a bond where Mavis becomes like a guiding light for Natsu in his adventures and growth within the Fairy Tail guild.
Naruto has shown incredible feats of strength, speed, and endurance. He has defeated some of the most powerful villains in his universe. But Mavis is no slouch either. Her Fairy Law is a very powerful spell. If we consider their growth potential, Naruto has the ability to constantly get stronger by unlocking new forms of his power, like Sage Mode and later the forms related to the tailed beasts. Mavis, on the other hand, has a deep knowledge of magic that could potentially allow her to counter any of Naruto's attacks. It really depends on the situation, the location, and how well they know each other's abilities.
Well, Naruto could bring his unique sense of justice to Fairy Tail. Since he has always been about protecting his friends and village, he would likely jump into any situation in Fairy Tail where the guild or its members are in danger. His Rasengan could be a very powerful attack against the various foes in the Fairy Tail world. And he could learn some magic from the Fairy Tail wizards too, like how to control magical elements which would be a whole new experience for him.
The guild master could embark on a quest to find ancient and powerful magic artifacts. For example, they might search for a lost crystal that has the power to enhance the magic of all guild members. This would involve traveling to dangerous and mysterious places, like a forgotten underground temple filled with traps.
In some fanfictions, he is a mentor - like figure. He teaches Mavis or other young wizards important lessons about magic, life, and the values of Fairy Tail. This could include things like the importance of friendship in magic, which is a central theme in the Fairy Tail series.
In fanfiction, the idea of Mavis and Zeref having a child often leads to very complex and interesting storylines. Some fanfictions might explore the child's powers, which could be a combination of Mavis's magic and Zeref's unique abilities. For example, the child could have an extraordinary control over life and death magic, or possess some form of enhanced intelligence due to their parents' natures.
In fanfiction, Mavis' brother can be portrayed in various ways. Some might depict him as a protective figure, always looking out for Mavis before her misfortunes. He could be a strong magic user, with unique abilities that are different from Mavis' own. For example, he might have a more combat - oriented magic compared to Mavis' strategic and leadership - related magic.
Perhaps they go on an adventure to find a healer who can ensure a healthy pregnancy. Along the way, they face various challenges like traversing through dangerous terrains. Jellal uses his magic to protect Erza and the unborn child, while Erza uses her combat skills when necessary. This adventure could also strengthen their bond with their guildmates as they all work together towards this important goal.