Well, clearly Yusei is at the top of the list. His character is central to the story, and his desire to make things right would lead him to time travel adventures. Then there's Kiryu. His complex relationship with Yusei and his own troubled past make him a character that could be involved in time travel. Maybe he wants to go back and change the events that led to his downfall. Also, Misty Tredwell could be involved. She has her own motives related to the Dark Signers, and time travel could be a way for her to either achieve her goals or be redeemed. Additionally, Rex Goodwin might be involved in time travel in fanfiction. As a powerful figure in the story, he could use time travel to further his grand plans or to correct something he sees as wrong in the timeline.
In Yugioh 5ds time travel fanfiction, Yusei Fudo is a very common character to be involved in time travel. He is the hero of the story and has a strong will to protect his friends and the city. His connection to the Signer Dragons also gives him a special role in any time - related events. Another one is Akiza Izinski. Her psychic powers could potentially be related to time travel in some fan concepts. Also, she has a complex backstory and emotions that could be explored through time - traveling scenarios. And of course, Bruno, with his mysterious origin and knowledge, is likely to be involved in time travel plots as he might hold the keys to understanding the time - space continuum in the Yugioh 5ds universe.
The members of the Black Organization also show up frequently in time travel fanfictions. Their presence in a time - travel scenario can really spice things up. For example, if they were to find out about time travel, they could use it to their advantage to cover their tracks or even change the past to ensure their continued existence and power. It creates a lot of interesting plot twists and power struggles.
Obviously, Harry Potter himself is very common. He has a strong connection to the story's main events, so it makes sense for him to be involved in time - travel scenarios. Hermione Granger is also often included. Her intelligence and knowledge of magic, especially time - related spells like the Time - Turner, make her a key figure. Ron Weasley usually tags along as well, being Harry's best friend and part of the main trio.
One of the most common characters is Doctor Strange. With his connection to the mystic arts and his knowledge of the Time Stone, he often plays a key role in time - traveling scenarios. Another is Loki, who is known for his trickery and ability to manipulate situations. He can use his wits to navigate through time. Also, Iron Man is often involved as his intelligence allows him to create or figure out time - traveling technology.
Definitely Maka. She's always at the forefront of trying to make things right in the Soul Eater story, so it makes sense for her to be a time - traveler in fanfiction. Black☆Star could also be a character who time - travels. His ambition to be the greatest might lead him to go back in time to gain more power or change the past to prove his superiority earlier. And Crona might time - travel in an attempt to escape their tortured past or to prevent the events that made them so broken in the first place.
Shinji is a very likely character. His complex relationship with his father and his role as the main pilot make him a prime candidate for time travel scenarios. He could go back in time to try and fix things or understand his father better.
One popular plot twist could be when a character travels back in time to prevent a certain event, but ends up causing it instead. For example, they try to stop a powerful duel monster from being released in the past, but their actions lead to its release earlier. Another could be a character from the future coming back and being revealed as an ancestor of one of the main characters, which changes the way they view their family history. And sometimes, time travel can cause a character to meet a younger version of themselves, leading to self - discovery and internal conflict as they see their past mistakes and virtues up close.
In some time travel fanfictions, characters like Jiraiya are involved. Naruto might go back in time and team up with a younger Jiraiya. They could go on adventures together, and Naruto could use his future knowledge to help Jiraiya in his research and also in battles. Another character could be Hinata. If Naruto travels back to their childhood, he might interact with her in a different way, changing their relationship dynamics.
Morgana might also be involved. If she were to travel through time, she could either try to change the past to gain more power in the present or she could be sent to the future to see the consequences of her actions. This might lead to a change of heart for her, or it could make her more determined to achieve her goals depending on what she witnesses.
Lelouch is a very likely candidate. Given his intelligence and his desire to change the world, time travel could be a means for him to correct past mistakes or gain more power to overthrow Britannia. Another one could be Suzaku. He has a strong sense of justice and might use time travel to prevent some of the tragedies that occurred.
Kite would approach time travel with a strategic mindset. He'd be looking for ways to gain an advantage, like finding new duel monster cards or techniques that he could bring back to his own time. Rio would be more concerned about the well - being of others. If she saw people in trouble in the time she traveled to, she'd try to help. Tori would be in awe. She'd be fascinated by the different cultures and dueling styles she'd encounter, and she might document her experiences in a journal.