Another theme is the relationship between mortals and deities. Natsu, being a mortal (or whatever his nature is in the original context), and the Time Goddess, a powerful deity, their interactions can range from friendship to something more complex like a mentor - mentee relationship or even a romantic connection in some fanfictions. The power dynamics and how they learn from each other are often explored.
One popular 'natsu and time goddess fanfiction' could be 'Time's Embrace'. In this story, Natsu discovers a hidden power related to the Time Goddess which leads him on an adventure through different eras. It has great character development and an engaging plot.
Gray is also a popular character to be paired with Natsu in these fanfictions. Their friendly rivalry can take on new dimensions when Natsu travels back in time. They could end up working together in unexpected ways in the past.
If Natsu travels to a time when Fairy Tail was just starting, he would be more eager to prove himself. His competitive side would be even stronger. In a more distant past, like when dragons were still around, he might be more in awe and a bit more reserved as he encounters these powerful and mysterious creatures. In a future where magic has evolved, he could be a bit out of place at first, but then adapt and become more open - minded to new forms of magic.
One common theme is self - discovery. When Natsu goes back in time, he often learns more about himself, his powers, and his past. For example, he might find out things about his family or how he came to be who he is.
One character that would be interesting to include is Mirajane. She has a motherly and observant nature. She could be the one to nudge Natsu and Lucy in the right direction when it comes to their relationship. For instance, she might arrange for them to go on a mission together that she knows will bring them closer. Laxus could also be in the fanfiction. His powerful presence can create a sense of danger or protection. If there's an outside threat to the guild while Natsu and Lucy are exploring their relationship, Laxus could be at the forefront of defending the guild, which would impact Natsu and Lucy's situation. And don't forget about Cana. She could be the one to create some light - hearted chaos, like daring Natsu and Lucy to do something that ends up bringing them closer, such as a bet that leads to a shared adventure.
I'm not sure who exactly Natsu is just from 'natsu reads fanfiction'. It could be a normal person who just enjoys reading fan - made stories. Maybe it's a nickname for someone within a particular fan community.
One great 'Natsu x Erza time travel fanfiction' is 'Time's Twist'. In it, Natsu and Erza are sent back in time due to a magical mishap. The story beautifully explores their relationship in a different era. They have to deal with the past versions of themselves and their guild mates while also trying to find a way back to their own time. It has some really exciting action scenes and heart - warming moments between Natsu and Erza.
One possible plot could be that Natsu and Erza are sent back in time to a crucial moment in the history of their guild. Maybe they go back to the time when the guild was first founded. They could end up having to protect the founders from a threat that was long forgotten in their own time. This would give them a chance to see how the guild started and also change some things for the better in the present.
One possible plot could be that Natsu and Mira accidentally stumble upon a magical artifact that sends them back in time. They might end up in a time when Fairy Tail was just being founded. There, they could meet the younger versions of their guildmates and have to work together to make sure the guild's history unfolds as it should, while also trying to find a way back to their own time.