Definitely the Suliban cell leaders. They have their own agendas and motives for time travel, which can be explored in depth. Phlox, the Denobulan doctor on 'Enterprise', can be an interesting addition. His alien perspective and medical knowledge can add a different flavor to the time - travel stories. Also, Reed, the tactical officer. His no - nonsense attitude can be a great contrast to the chaos that often comes with time travel, making for some interesting character interactions.
The Suliban themselves are quite interesting. Their ability to time - travel gives them a unique perspective and a lot of potential for character development. Captain Archer from 'Enterprise' can also be a great character to write about in this context. His leadership and values can be put to the test when dealing with Suliban time - travel shenanigans. And then there's T'Pol. Her Vulcan logic in the face of time - travel paradoxes can create some really engaging storylines.
Well, a usual theme is the power struggle. The Suliban, being time - travelers, might use their knowledge of the future or past to gain an advantage over others in the 'Enterprise' universe. This can lead to various power - related sub - themes like political manipulation or control over resources. Additionally, there's the theme of redemption. A character who made mistakes in the past might try to correct them through time travel, which adds an emotional and character - development aspect to the fanfiction.
Naruto himself is of course the most interesting. His character development can be explored in a whole new way when he travels through time. Also, characters like Sasuke. Imagine Sasuke seeing a different Naruto from the past and how that would change their dynamic. And Kakashi too. He has a rich history, and seeing Naruto interact with a younger Kakashi in the past can be really engaging.
The pilot of Flight 19 is definitely an interesting character. He has the responsibility of leading the crew in this strange time - traveling situation. His leadership skills and decision - making abilities can be explored in different ways. Another interesting character could be the flight engineer, who might be the one to figure out how the time travel technology works.
Goku would be really interesting. His naivete in a time - travel situation could lead to all sorts of unexpected events. He might not fully understand the implications of changing the past and end up doing things just because they seem fun at the moment. Sanzo is also a great choice. His no - nonsense attitude in a different time period could create a lot of conflict, especially if he has to deal with the different cultural and social norms of the past. Another interesting character is Hakkai. His intelligence and ability to adapt would make for some really engaging time - travel stories as he tries to figure out how to use his skills in a new and unfamiliar time.
Fugaku himself is obviously a very interesting character. His journey through time allows us to see different sides of him. He might be a strict and stoic clan leader in his original time, but during time travel, we can see his vulnerability and his struggle to adapt to different situations. Another interesting character could be his younger self. The interactions between Fugaku from different time periods can be really fascinating, as he tries to guide or understand his younger self. Also, any characters who are aware of the time travel and try to manipulate it for their own gain, like a rogue ninja who wants to change history to gain power, can add a lot of intrigue to the story.
Hinata would be a great choice. He's so full of energy and determination. If he traveled back in time, he could share his experiences of playing against strong opponents like Nekoma and Aoba Johsai with his younger self. It would be really cool to see how his past self would react and grow even faster with that knowledge.
Bakugo could also be a great choice. If he went back in time, he might have to face his own arrogance from the past and try to change his ways earlier. It could be a journey of self - discovery for him as he realizes how his actions in the past affected others and how he can be a better person and hero in the future.
Hook would be an interesting character for OUAT time travel fanfiction. His past as a pirate and his relationship with Rumplestiltskin are full of drama. If he were to time travel, he could go back to when he first lost his hand to Rumplestiltskin and try to change that event. Or he could travel to a time when he was a more ruthless pirate and see how that version of himself compares to the man he has become.
Morgan could be an interesting addition. He might accidentally get caught up in Chuck's time - travel adventures. His comical nature could provide some light - hearted moments in an otherwise complex time - travel plot, like when he misunderstands the technology or customs of a different time.
Issei himself is of course very interesting. His reactions to different time periods and how he uses his knowledge from the future can be really engaging. Then there's Rias. Her presence can add a layer of complexity, especially if she has different relationships with Issei in different timelines. Another interesting character could be Vali. His rivalry with Issei can take on new dimensions when time travel is involved, like competing in different historical battles or for the affections of a character in a different era.