She could go to the mountains. The high peaks are often seen as a place of solitude and mystery in many stories. There, she might find a cave where she can hide and think about her life. It could also be a place where she discovers some long - forgotten magic that has been dormant for ages.
Another possibility is that she heads towards the river. Following the river's path, she could end up in a different part of the land. Along the way, she might meet some fishermen or travelers who tell her stories about other places. She could even get on a boat and sail down the river to a new destination, far away from the Encanto.
She could run into some trouble. Since she's on her own, she might get lost in the jungle outside the Encanto. Without the protection of the family's magic, she has to fend for herself. But this could also be a chance for her to grow stronger. She might find a small village where she starts to learn new skills, like farming or making clothes. Eventually, she could return to the Encanto with a new perspective and newfound abilities.
Maybe she feels left out in the family. In the Encanto story, Mirabel is the odd one out not having a special gift. This could make her feel so alone and unwanted that she decides to run away.
He could go to the Forbidden Forest. It's a large and mysterious place where he could hide. There are many hiding spots and magical creatures that could either protect him or at least keep his presence a secret.
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.
Another reason could be that she wants to explore the world on her own terms. In the fanfiction, Mirabel may be tired of always being in the family's protective bubble. She desires to see what lies beyond the village and the mountains, so she runs away to start her own adventure.
It could make them realize how much they've taken her for granted. They might have been so focused on their gifts and their own roles that they didn't notice Mirabel's pain.
One popular 'mirabel runs away fanfiction' might be the one where she runs away to discover a hidden magical realm in the forest. In this story, she meets new magical creatures and learns more about her powers outside the context of her family's expectations.
He might go to his mother's place. It's a place where he has always felt safe and loved. His mother has always been his anchor, and even though it might be a risky move as monsters could track him there, it could be his first instinct. Another option could be to go to a big city like New York. There are so many people and places to hide. He could blend in with the crowds and use the chaos of the city to stay unnoticed. He could also find refuge in an abandoned building or a place that has some sort of magical protection that he discovers by accident.
It could be someone who is jealous of Mirabel's potential. Maybe a relative who feels that Mirabel's new - found importance in the family (even if she doesn't fully realize it yet) threatens their own status. For instance, a cousin who was once favored but now sees Mirabel as a threat.
She could run to a nearby human town. It would be a place where she could blend in to some extent, at least among the humans. There, she might try to live a normal life for a while, away from the vampire politics and drama.