Seto Kaiba is also often used. His ambition and his drive to be the best duelist could lead him to time - travel in search of more powerful cards or to prove his superiority in different eras. He might go back in time to challenge the greatest duelists of the past with his modern - day deck.
Jon Snow is quite popular. Fans often write about him time - traveling. He could go back in time to change his own fate, like preventing his death or changing how he was treated as a bastard. Daenerys Targaryen is also a common choice. She might time - travel to the time of her ancestors to learn more about ruling and dragon - riding.
Seto Kaiba is also a common feature. His drive for power and his rivalry with Yugi are great fodder for fanfiction. Fanfics might show his more vulnerable side or explore his relationship with his brother Mokuba in different scenarios.
Master Chief is often a central character. His iconic status in the Halo series makes him a natural choice. Writers might send him back in time to change crucial events. Another popular character is Cortana. Her intelligence and connection to the Halo technology can create interesting time - travel scenarios, like she uses her knowledge to prevent a system malfunction in the past that would have had catastrophic consequences.
Connor is often a popular character. His ability to adapt and his complex relationship with humans and his own identity make him a great candidate for time - travel scenarios. He could be sent back in time to change the course of the android - human relations he was initially a part of.
Yugi Moto is often featured. He's a very popular character in the Yu - Gi - Oh! world, and in the crossover fanfiction, he might be the one to encounter the Infernity cards or be involved in duels related to them. Another one could be Kaiba. His competitive nature and love for powerful cards could lead to him being interested in the Infernity archetype.
Hermione is a very popular character. Her intelligence and love for knowledge make her a great candidate for time - traveling adventures. She could use her wits to navigate the challenges of different time periods. Harry is also common, as he has a natural inclination towards heroics and could be sent back in time to prevent some of the tragedies that occurred in his life.
Egwene al'Vere is also a popular choice. Her transformation would change her role as a leader among the Aes Sedai. If she became male, she would have to navigate the male - dominated aspects of the world's magic and politics in a new way. And her relationships with male characters, especially Rand, would take on a whole new dimension.
Sasuke is also a popular choice. Given his complex character and his quest for power, in a time - travel scenario, he could go back in time to gain more power or change the events that led to the downfall of his clan. Another character is Kakashi. His past and his relationship with Obito could be explored in a time - travel fanfiction. He could try to prevent Obito's fall to the dark side if he had the power to time - travel.
The Emperor is also a common character. Fans like to imagine how his actions in different time periods could change the fate of the galaxy. His vast power and knowledge make for great time - travel - related storylines.
King might also be a character in time travel fanfiction. His search for his true identity could be further explored through time travel. He could go back to the time when his species was more prevalent in the Boiling Isles to learn about his origins, which would be an exciting adventure in the context of time travel fanfiction.