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.
When Natsu travels back in time, say to a time of great peace in the magical world, he might be more laid - back and less battle - ready. His fiery nature could be toned down a bit as he experiences a different way of life. However, if he travels to a time of chaos and war, his protective instincts would be on high alert and he would be more aggressive in his actions. In a future time where he has achieved great power, he could be more confident and perhaps a bit cocky, but still retain his loyalty to his friends.
Natsu, being his impulsive self, might initially have a hard time adjusting to more reserved time periods. For example, in a time when magic was more secretive and not used so openly, he might constantly be getting into trouble for showing off his powers. Ultear, on the other hand, who is more calculating, might find it easier to blend in. But in a more chaotic time period, like during a war, Ultear's calm demeanor could be shaken as she has to face more extreme situations. In a peaceful future time, Natsu might become more laid - back as there's no need for constant fighting, while Ultear might feel a bit out of place without her usual problems to solve.
If Natsu goes back in time, his relationships would be very different. With his friends, he might have a new level of understanding. For example, he could see how they grew up and the challenges they faced in the past. He might be more protective of them, especially if he knows what's going to happen in the future. His relationship with Lucy could also change. He could see her in a new light, perhaps realizing things about her that he didn't before when he first met her in the present.
He might be more in tune with nature. Since dragons are often associated with nature, Natsu could have a deeper respect and understanding of the natural world around him, showing more kindness to animals and plants.
One plot idea could be Natsu traveling back in time to prevent a great disaster that he has knowledge of in the present. For example, he could go back to stop the rise of a powerful dark wizard before they gain too much strength. Another could be Natsu traveling to the past to meet his long - lost family members and learning about his past and heritage. He might also time travel to the future to see how his friends and the guild have changed and use that knowledge to better the present.
One main theme is self - discovery. When Natsu travels through time, he often has to re - evaluate who he is and what his purpose is. Another theme is the power of friendship. Despite being in different time periods, Natsu's relationships with his guild mates play a crucial role.
One great 'Dark Natsu Time Travel' fanfiction is 'Time's Twist'. It takes Natsu on a journey through different time periods in the Fairy Tail universe. The story is full of action as Dark Natsu battles foes from various eras. Another interesting one is 'Journey Through Time with Dark Natsu'. It focuses on how Dark Natsu's presence changes the course of history in the story.
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.
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 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 interesting plot could be Natsu going back in time to prevent a great disaster that happened in the past of his world. For example, he might try to stop the initial attack of a powerful dark guild that had long - lasting negative impacts. Another plot could involve Natsu traveling back to his own childhood and having to deal with his past self, which could lead to some comical and heartwarming moments as he tries to impart some of his current wisdom.