Perhaps Hiccup finds a way to talk to the spirits of dead dragons through some sort of ancient magic. This could involve him getting advice from the great dragons of the past, like the Bewilderbeast, on how to better lead Berk and deal with new threats that are emerging. He might also have to face some moral dilemmas as a result of this new form of communication.
One idea could be that Hiccup discovers a new language that only the rarest of dragons understand, allowing him to communicate with a long - lost and extremely powerful dragon species. This could lead to him having to make difficult decisions about whether to share this knowledge with Berk or keep it a secret to protect the new dragons.
One idea could be that Hiccup, after turning into a dragon, has to learn to communicate with his old dragon friends in a new way. Since he now experiences the world as a dragon, he might discover new dragon abilities and secrets that were hidden from him before. Maybe he has to find a way to turn back, but in the process, he helps the dragon world solve a big problem, like dealing with a new and dangerous enemy.
In a fanfiction, Hiccup could be faced with a situation where the other gods are jealous of his status as the God of Dragons. They conspire to strip him of his powers. Hiccup then has to rely on his friends, both human and dragon, to regain his powers. He might go on a quest to find ancient artifacts that were used to first bestow the God of Dragons title upon him. This would involve a lot of adventure, battles, and self - discovery.
One idea could be that Hiccup discovers a new type of dragon with unique abilities. For example, a dragon that can change its color to blend in with its surroundings. This could lead to a whole new adventure as he tries to understand this dragon and protect it from those who might want to use it for bad purposes.
One plot idea could be that Hiccup, as a female, has unique ways of bonding with the dragons. For example, she might use her more empathetic nature to understand their needs better than in the original story. Another could be that she faces different challenges in the Viking society which is often male - dominated. Maybe she has to prove herself even more to be accepted as a dragon rider.
One interesting plot idea could be that the dragons start to communicate with Hiccup in a more complex way through their listening skills. For example, they might be able to understand his unspoken fears and desires, and then help him in ways he never expected, like leading him to a hidden treasure that only they knew about because of their unique perception.
There could be some new characters introduced as well. Maybe a mysterious dragon rider from a far - off land who also has the ability to talk to dragons. This character could either be an ally or an antagonist to Hiccup, depending on their motives. Or perhaps an old dragon trainer who has long - forgotten secrets about the dragons' language that Hiccup has to discover.
A possible plot is that there is a magical event that switches the minds of Stoick and Baby Hiccup. So Stoick has to figure out how to take care of himself as a baby while Hiccup, in Stoick's body, has to deal with the responsibilities of being the chief. It would be full of comical and heartwarming moments as they both learn about each other in a very different way.
Well, a plot could revolve around them starting a family. Hiccup and Heather could face difficulties in having children, like dealing with some sort of magical or environmental factor that is affecting their ability to conceive. Or perhaps they adopt a child from a troubled tribe and have to help the child adjust to their new life with them.
One idea could be Hiccup discovers a hidden tribe in a remote jungle. Another could be that he encounters a mythical creature in an uncharted ocean region. Maybe he also teams up with a group of international dragon riders to save a world - spanning dragon sanctuary.
One idea could be that Hiccup discovers a new type of half - dragon that has unique abilities, like the power to control time briefly. This could lead to adventures where he has to use this new discovery to save Berk from an ancient threat that is about to be unleashed. Another plot could involve the half - dragon being a hybrid of a very rare and powerful dragon species, and Hiccup has to protect it from dragon hunters who want to use its power for evil.