Maybe the main character is an alien from another planet. Their spaceship crashes near Leo's small town. Leo is the first human the alien meets. Leo is curious rather than afraid, and he helps the alien repair the ship while learning about different cultures and technologies. This meeting between them could be filled with humor and misunderstandings as they try to communicate.
It could be a young girl who is lost in a big city. Leo, a kind - hearted street performer, sees her and offers to help. She has a troubled past and Leo's positive attitude starts to change her perspective on life. Their meeting is the start of a journey of self - discovery for the girl.
One possible plot could be that the protagonist is a new student in school and meets Leo, who is a bit of an outcast but has a hidden talent for art. They bond over their shared love for a certain artist and Leo starts to open up, leading to a deep friendship.
A wise old wizard in the story could be a main character. He has the knowledge and power to potentially reverse the spell on Leo. He guides Leo's friends and family on their quest, providing them with clues and magical items that are needed to solve the mystery of turning Leo back.
Maybe a new super - powered villain who has the ability to manipulate minds. They target the meeting because they want to turn the superheroes against each other. Since Bucky has a history of being mind - controlled, he would be especially vulnerable to this villain's powers. So, this villain could be a great antagonist in the fanfiction. They could start by subtly influencing the conversations at the meeting and then escalate to full - on attacks.
The other character could be a fellow wizard or sorcerer. They might meet at a magical gathering and initially be rivals, but then realize they can work together to face a greater threat like an evil dark mage.
Perhaps Sirius Black. He has a deep connection to Harry and is a key member of the Order. The fanfiction could show him taking charge during a meeting, using his knowledge of the wizarding world and his family's secrets to come up with strategies. His relationship with other members, especially those who are skeptical of him, could also be explored during the meeting.
Obviously, America would be one of the main characters. He represents the United States in Hetalia. Canada might also be a key figure as another North American country. And from South America, characters like Argentina or Brazil could be important. They are all likely to play major roles in this meeting within the fanfiction.
It could also include the daughter's mother. Maybe she plays a role in bringing the father and daughter together. She could be a strong - willed woman who has been raising the daughter on her own but realizes that the father needs to be in their daughter's life. There could also be a side character like the daughter's best friend who gives her advice on how to handle the situation when she meets her father.
Another possibility is that one of Leo's classmates becomes jealous of his powers. This classmate could start spreading rumors about Leo, trying to turn everyone against him. Eventually, the jealousy could turn into something more sinister, and the classmate could team up with some bad elements to try and take away Leo's powers.
It could be an enemy. For example, a rival in a competition or a villain who has a grudge against Leo.
It could be a corrupted version of one of the Fairy Tail members from the other dimension. For example, an evil Natsu who uses his fire magic for destruction and domination. The real Natsu would have to face his own dark self and find a way to defeat him without losing his own identity.