What are some interesting ideas for HTTYD time travel fanfiction?

A really interesting plot would be if a time - traveling villain from another dimension comes to the HTTYD world and tries to change the past to make dragons evil. Hiccup and his friends then have to travel through different time periods to stop this villain. Or perhaps the characters travel to a time when there were giant, prehistoric dragons that they have to deal with, and they learn new ways of dragon - riding from the ancient Vikings who tamed those behemoths.

A great concept for this fanfiction would be a sort of 'what if' scenario. What if the Great Valley in 'Land Before Time' was discovered by the Vikings from 'HTTYD'? The Vikings might see it as a new place to settle, but they would have to deal with the dinosaurs already living there. The dinosaurs, on the other hand, would be faced with these strange new creatures (humans and dragons) invading their home. This could lead to a series of conflicts and alliances as both sides try to co - exist.

A cool concept would be a hybrid character. Imagine a Spartan who has been genetically altered with some dragon DNA. This character could have the strength and combat skills of a Spartan along with the ability to breathe fire or fly like a dragon. Or perhaps the Covenant could be interested in the dragons in the HTTYD world because they see them as a new form of powerful weaponry to add to their arsenal.

In a rotg and httyd crossover fanfiction, perhaps the Guardians could come to Berk to protect it from a new threat. Pitch Black might team up with some dragon hunters, and the httyd characters along with the Guardians would have to work together. Hiccup could learn some new skills from the Guardians, like how to be more stealthy from Jack Frost, and the Guardians could be in awe of the dragons' intelligence and strength.

Maybe the main character in the HTTYD runaway fanfiction runs away due to a misunderstanding. They think they've accidentally caused harm to their dragon or their village. As they run, they discover a long - lost dragon lair filled with ancient secrets. This discovery could lead them on a journey to redeem themselves and bring back valuable knowledge to their people.

One idea could be exploring a new type of dragon that has unique abilities, like a dragon that can control time. Another could be a story about a dragon rider who loses their memory but still has an instinctive bond with their dragon. And perhaps a fanfiction where the dragons and riders have to face an otherworldly threat that they've never encountered before.

Another interesting concept is a villain crossover. Mother Gothel could team up with a dragon hunter from HTTYD. They could both have their own motives, like Mother Gothel wanting to use the dragons to keep Rapunzel trapped forever, and the dragon hunter just wanting to capture the dragons for profit. Hiccup and Rapunzel would then have to join forces to stop them. This would create a lot of action - filled scenes and also some interesting character interactions as they try to outwit the villains.

One idea could be a story where Tracer accidentally travels back to the Omnic Crisis era. She could meet the younger versions of the original Overwatch founders and try to help them in ways that might change the future of Overwatch. Another could be Reinhardt going back in time to his early days as a Crusader and having to relive some of his toughest battles with the knowledge he has now.

One interesting idea could be Tsuna going back in time to prevent certain tragedies in his family's past. This would change the whole dynamic of the Vongola family in the present.

One interesting idea could be Itachi traveling back in time to prevent the Uchiha massacre. He could use his knowledge of future events to find a way to resolve the conflict between the Uchiha clan and the village without bloodshed. Another idea might be Itachi traveling forward in time to see the consequences of his actions and how his younger brother Sasuke has turned out. He could then try to guide Sasuke in a different direction from the future he witnessed.