A cool plot could be that a character time - travels to the very beginning of the SMP and tries to befriend all the original members in a different way. This might change how the groups and factions form later on. For instance, if Dream was befriended differently, it could change his whole attitude towards the server. Or, time travel could be used to explore what would happen if a dead character was brought back to life at a different point in time. How would their return affect the relationships and power dynamics? Maybe Wilbur Soot could be brought back right before the creation of L'Manberg and have a second chance at leading it in a more peaceful way.
Well, a plot idea could be a time - traveling device that malfunctions and sends multiple characters to different time periods randomly. Some might end up in the past during important historical events on the SMP, while others could be sent into the future to see the consequences of their current actions. This would create chaos as they try to find their way back to their original time. Also, a character could time - travel to meet their past or future selves. This encounter could lead to self - discovery and a change in their character arc. For example, if Tubbo met his future self, he might gain wisdom about how to handle the difficult political situations on the SMP.
One interesting plot idea could be a character traveling back in time to prevent a major war on the SMP. They could change key events and alliances, leading to a completely different SMP landscape. For example, if Tommyinnit went back to before the L'Manberg revolution, he might be able to stop Schlatt from taking over in the first place. Another idea is a character from the future coming back to warn the current SMP members about a looming threat that they don't yet know about. This could create a sense of urgency and force characters to make difficult decisions. And perhaps a time - traveling villain who is trying to rewrite history for their own gain, like stealing all the valuable resources before they were ever discovered.
A crossover with a fantasy - themed story like 'Lord of the Rings' could be amazing. Imagine the Dream SMP characters in Middle - earth. Tommy could be like a young hobbit getting into all sorts of mischief, and Dream could be a sort of dark wizard - like figure. They'd have to deal with orcs, trolls, and all the other classic LOTR threats.
A cool plot might be that the BNHA villains discover the Dream SMP and see it as a new place to expand their evil plans. They kidnap some of the SMP members thinking they can use them for something. The SMP members then team up with the BNHA heroes to fight back. Techno could use his combat skills and the BNHA heroes would be amazed at his fighting style without having a Quirk. And the SMP members could learn about the importance of working as a team like the BNHA heroes do.
I think Fundy would be likely to time travel. He has a complex relationship with his family and the SMP. Time travel could be a means for him to understand his father better or change the way his family relationships developed. GeorgeNotFound could also be a candidate. He's often in the background but has a strong connection to Dream. Time travel might be his way of getting more involved in the SMP's events and helping Dream in a different way. Lastly, Niki could be a time traveler. She has been through a lot of changes on the SMP, and time travel could be her opportunity to go back and make the SMP a more inclusive and friendly place from the start, especially for those who have been marginalized.
One idea could be Yoda traveling back in time to train Anakin Skywalker differently, thus preventing his fall to the dark side. Maybe he goes back to the very beginning of the Jedi Order to gain more knowledge about the Force and bring it back to his own time.
One idea could be Shinji traveling back in time to prevent the Second Impact. He might try to change the actions of his father that led to it. Another could be Asuka traveling to a future where the Evangelions have been completely forgotten and she has to figure out how to get back to her own time.
Another plot could be a character from the future coming back to the present in Shameless. They could be trying to stop a future disaster that is somehow linked to the Gallagher family. This would involve a lot of mystery and intrigue as they try to figure out what the future event is and how to prevent it while dealing with the chaos of the present - day Gallagher family.
One idea could be Goten traveling back to the Saiyan - Saiyan war era. He could end up changing some small events that have big impacts on the future, like uniting some Saiyan clans earlier. This would create a whole new timeline where relationships between characters are different.
Maybe a character travels forward in time and sees a dystopian version of the ACOTAR world. They then have to go back and try to prevent the events that led to that future. They could face many challenges along the way, like not being believed or having to work against powerful forces who benefit from the future they saw. It would be a race against time to save their world.
A possible plot for 'Haikyuu time travel fanfiction' is that Tsukishima travels back to his childhood when he first started to dislike volleyball. He could then understand why he developed that negative feeling and change his attitude from the start. This would lead to a much stronger Tsukishima in the present day. Another idea is that a team manager travels back in time to recruit a different set of players for the team, creating a completely different team dynamic. Maybe they could even bring back an old - school player who had unique skills that could revolutionize the team's playing style.
One idea could be a modern-day character traveling back in time to the Hakuoki era and getting involved in the political intrigue. They could use their modern knowledge to try and change the course of events. Another plot could involve a character from the Hakuoki world traveling to the future and being shocked by the technological advancements. Maybe they struggle to adapt to the new world but also find new ways to bring back knowledge to their own time.