There might also be a wise old mentor figure. This could be someone from a past era who has a deep understanding of time travel and its consequences. They guide the protagonist, helping them to avoid making catastrophic mistakes in the past. For example, an ancient wizard who has seen the chaos that can be caused by meddling with time.
Sometimes, there are antagonists who want to use time travel for their own evil purposes. Maybe they want to change history to gain power or wealth. These characters add conflict to the story, as they are constantly trying to thwart the protagonist's attempts to preserve the integrity of the timeline.
One interesting concept could be the alteration of historical events. In kakanaru time travel fanfiction, characters might go back in time and accidentally or intentionally change a significant moment in history, which then has a ripple effect on the future. For example, a character could prevent a war from starting, leading to a completely different social and political landscape in the present day of the story.
In 'kakanaru yaoi time travel fanfiction', a prevalent theme is the struggle against time itself. The characters may be fighting against the limitations of time, such as trying to extend their time together or deal with the consequences of time - travel - induced changes. There can also be themes related to self - discovery within the context of a different time. The characters might find new strengths or weaknesses as they adapt to the new time environment, which in turn affects their relationship in unique ways.
Angel can be a prominent character in Buffy time travel fanfiction. His long life and complex relationship with Buffy make for interesting storylines. He could be a part of Buffy's time - traveling journey, either as a helper or as someone who is also affected by the changes in time.
Time lords from Doctor Who are also quite popular in x time travel fanfiction. Their natural ability to travel through time and space makes them a natural fit. They can bring their unique culture and knowledge into different time - travel scenarios. Superhero characters are also used a lot. Imagine Superman going back in time to prevent a major disaster. It combines the action - packed nature of superhero stories with the intrigue of time travel. Villains can be popular too. A villain who travels through time to change the past in their favor can create some really exciting and complex storylines.
Yuji Itadori is often a popular choice. His determination and unique abilities make for interesting time - travel scenarios. He could use his physical strength and Sukuna's power in different ways in the past or future.
Liz is also quite popular. Fans might write about her traveling back in time to study the origins of the aliens in Roswell. She could use her scientific knowledge in different time periods and maybe even find a way to change the fate of the aliens for the better.
In Harry time travel fanfiction, Harry is the most prominent character as the stories typically focus on his experiences while traveling through time. However, other characters like Severus Snape can be very interesting. His complex past and his relationship with Harry can be explored in new ways when time travel is introduced. Luna Lovegood is also a character that might be included. Her unique perspective on the wizarding world can bring a fresh view to time - travel related events and their implications.
Sorry, I'm not that familiar with specific 'kakanaru yaoi time travel fanfiction'. You can try searching on some popular fanfiction websites like Archive of Our Own (AO3). They usually have a wide range of fanfictions in different categories, and you might be able to find what you're looking for there.
Since we don't know the specific context of 'kakanaru', we can only guess. They might be the main characters from a well - known fictional universe. Maybe they are two heroes who are forced to confront their feelings for each other in a way that is both unexpected and intense, as the 'lemon' tag might suggest. Or they could be a hero and a villain, where the forced situation makes them see each other in a different light and develop a relationship that is not typical for their usual roles.
The Flash himself, of course. He is the central character and his ability to time travel is what drives most of the stories. Fans love to explore his different adventures through time.