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.
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.
Iroh would be fascinating to see time - traveling. He has so much wisdom already. If he traveled to different times, he could share his knowledge and perhaps change some key events. He could also gain more insights from other time periods, which would further enrich his already deep understanding of the world.
Daenerys Targaryen. She has a strong will and a mission to claim the Iron Throne. If she time - traveled, she could meet her ancestors and learn from their successes and failures. She could also try to prevent the downfall of her family in the past, which would have a huge impact on the present state of Westeros in the fanfiction world.
I think Izuku Midoriya would be really interesting. He's the main character and has so much knowledge about the heroes and villains. If he time - travels, he could use his understanding of quirks and combat strategies to change the past or future in significant ways. For example, he could go back and give advice to All Might when he was younger, which might change how All Might deals with villains later on.
Ahsoka Tano would be a great choice. She has a complex history within the Clone Wars. If she were to travel back in time, she could interact with her younger self. She might be able to pass on wisdom she gained from her later experiences, like how to better handle the politics within the Jedi Order and the Galactic Republic.
Wei Wuxian would be very interesting. He has such a complex character arc in the original story. If he were to travel through time, say, back to a time before his fall from grace, he could potentially change things for the better. He could use his knowledge of the future to avoid certain tragedies, or he could interact with his past self in a really unique way, like giving advice or just seeing how much he has changed.
I think Zoro would be really interesting to time travel. He has a strong sense of honor and his swordsmanship skills are top - notch. If he traveled to the past, he could learn from the greatest swordsmen of that era and bring back ancient sword techniques to the present. In the future, he could see how swordsmanship has evolved and maybe even find a way to further enhance his own skills.
Reaper could also be an interesting focus. His dark and mysterious past could be explored further through time travel. He could go back to the time when he was still Gabriel Reyes, before the transformation. This could show the events that led to his current state, and perhaps in a time travel scenario, he could even have a chance to change his fate. It would be a story full of drama, mystery and action as he grapples with his past self and the decisions that led him to become Reaper.
The Dragonborn would be a very interesting character to feature. Since they already have special powers like Shouts, seeing how they use these powers in different time periods would be fascinating. For example, using the Unrelenting Force shout in an earlier era where the people have never seen such a power before.
I think Kai would be a great focus. His hot - headed nature could lead to some really chaotic time - travel situations. For instance, if he travels back to a time when the Fire Temple was in danger, he might rush into action without fully understanding the consequences, and end up changing the future of the Fire Element in Ninjago in unexpected ways.