Perhaps Regina time travels to a time when a great war was about to start in the fairy - tale world. She could use her skills and knowledge to either try to stop the war from happening or to side with a particular group to ensure a better future for herself and those she cares about. She might also form unexpected alliances during this time - traveling adventure.
One idea could be that Regina travels back in time to when she was a young girl. She could use her knowledge from the future to change some of the bad experiences she had, like standing up to her mother earlier. Another plot could be that she travels to a time before she became evil and tries to prevent herself from making the wrong choices that led her down that path.
Well, a plot could involve time - travel. Henry somehow gets sent back in time to when Regina was first starting to embrace her dark side. He tries to change her path by showing her the future and how she could have a loving relationship with him. Another interesting plot might be that there's a curse on Henry that makes him forget Regina, and Regina has to go through a series of trials to break the curse and make him remember their relationship. Also, they could be on a quest to find a magical artifact that can restore all the good memories of the people in Storybrooke that Regina once took away, and this journey brings them closer together.
One idea could be that Regina, trying to redeem herself, takes Roland under her wing to teach him magic in a secret way. This could lead to a series of adventures as they have to hide their lessons from the rest of the town. Another plot could involve Roland getting lost in a magical realm and Regina being the only one who can sense his presence and rescue him, leading to a journey of self - discovery for both of them. And perhaps they could team up to stop an evil force that is threatening Storybrooke, with Roland's innocence and Regina's power being a perfect combination.
One idea could be that Twilight Sparkle accidentally activates a time - travel spell and ends up in the past, right when Equestria was first being founded. She has to figure out how to get back while also making sure she doesn't change history too much.
One idea could be a modern - day character traveling back to the prairie days and introducing new farming techniques. They could use their knowledge of modern irrigation methods to help the Ingalls family during a drought. Another plot could involve a character from the past traveling to the future and being amazed by modern technology like airplanes and computers. They then take this knowledge back to their own time and try to make changes in their community.
One idea could be that Regina and Dr Facilier form an unlikely alliance to take down a common enemy in Storybrooke. Maybe a new dark force has emerged that threatens both of their interests, so they have to put aside their differences.
One idea could be Yoda traveling back in time to train Anakin Skywalker differently, thus preventing his fall to the dark side. Maybe he goes back to the very beginning of the Jedi Order to gain more knowledge about the Force and bring it back to his own time.
One idea could be Shinji traveling back in time to prevent the Second Impact. He might try to change the actions of his father that led to it. Another could be Asuka traveling to a future where the Evangelions have been completely forgotten and she has to figure out how to get back to her own time.
Another plot could be a character from the future coming back to the present in Shameless. They could be trying to stop a future disaster that is somehow linked to the Gallagher family. This would involve a lot of mystery and intrigue as they try to figure out what the future event is and how to prevent it while dealing with the chaos of the present - day Gallagher family.
One idea could be Goten traveling back to the Saiyan - Saiyan war era. He could end up changing some small events that have big impacts on the future, like uniting some Saiyan clans earlier. This would create a whole new timeline where relationships between characters are different.
Maybe a character travels forward in time and sees a dystopian version of the ACOTAR world. They then have to go back and try to prevent the events that led to that future. They could face many challenges along the way, like not being believed or having to work against powerful forces who benefit from the future they saw. It would be a race against time to save their world.