Maybe he's running away from the pressure in the village. There are always high expectations on him, and he might feel suffocated and need some time alone to figure things out.
One possible interpretation could be that the female character named Hiccup has some sort of internal turmoil or external pressure that makes her run away. In fanfiction, this could be a setup for an adventure or self - discovery journey. Maybe she's running away from a restrictive society or a difficult family situation.
Well, if Mal runs away in 'descendants' fanfiction, she might be seeking freedom from the expectations placed on her. Maybe she's tired of being in the middle of all the drama and power struggles in Auradon. She could go to a hidden place, perhaps an enchanted forest where she can be alone and figure out who she really is without all the royal and villainous influences.
One consequence could be that his friends worry about him a great deal. They might go on a search for him, which could put them in danger as well. After all, they care about Naruto deeply and won't just let him disappear without trying to find him.
Perhaps Ash runs away after an argument with his friends. He feels like they don't understand him. He runs off to a beach town where he meets a mysterious old trainer. The old trainer tells Ash stories of his own past adventures and failures. Ash realizes that running away isn't the solution and decides to go back to his friends, with a new perspective on their relationships.
One possible theme could be self - discovery. Ginny running away pregnant might force her to figure out who she is on her own, away from the expectations of others.
Well, maybe Harry runs away to Canada because he's tired of the drama in his home country. He could be seeking a new start, away from all the chaos. In Canada, he might meet new friends who help him discover a whole new side of himself.
He could go to the mountains. There are so many hidden caves and areas in the mountains that he could explore. It would be a great place for him to hide and be alone with his thoughts. Plus, there might be some powerful Pokémon that live there that he could interact with.
Such fanfictions might also face issues in terms of appealing to a wider audience. Since the 'mpreg' concept is not something that is native to the Naruto world, it may only attract a very niche group of readers who are interested in this very specific and often controversial theme. Moreover, it could potentially distort the characters' original personalities as they are being forced into situations that are not in line with their canonical traits.