Since I don't know the exact 'Medusa Children Story', I can only guess. There could be the children themselves as main characters. Maybe a brave little boy or girl who is not afraid to face the mystery or danger related to Medusa.
I don't know for sure, but if it's based on the myth, Medusa would be one of the main characters. There might also be characters like Perseus, although in a kids' version, they might be portrayed differently.
The main characters in the original Medusa story are Medusa herself, Athena, and Poseidon. Medusa is the central figure who gets transformed. Athena is the goddess who curses Medusa, and Poseidon is the god whose actions in Athena's temple lead to Medusa's misfortune.
In 'Medusa a Love Story', Medusa is surely a main character. She is the focal point around which the love story would be centered. As for the other main character, it could be a brave adventurer who stumbles upon her lair not with the intention of killing her but with an open heart that is capable of loving her. This character might be a hero figure who has seen beyond the horror stories about Medusa and is drawn to her for some deeper, emotional reasons.
There are several main characters in the original Medusa story. First, there is Medusa. She was a beautiful maiden before she was cursed. She was turned into a Gorgon with a face so hideous that her gaze could turn people into stone. Athena is another important character. As a goddess, she was angry when Medusa was violated in her temple and she cursed Medusa. Perseus is also a main character. He is a hero who is sent on a quest. His task was to obtain Medusa's head. He had to use his wits and courage, as well as some magical items, to be able to get close to Medusa and cut off her head. These three characters are essential to the story's development and its various themes.
The main characters are Medusa, who is the Gorgon, and Perseus, the hero who slays her.
The main characters in the real Medusa story are Medusa herself, Poseidon, and Athena. Medusa was the one who was transformed. Poseidon was the god who violated her in Athena's temple, and Athena was the goddess who turned Medusa into a Gorgon as a form of punishment.
The main characters are Perseus and Medusa. Perseus is the hero who has to face the terrifying Medusa.
The main characters are Perseus and Medusa. Perseus is the hero who undertakes the dangerous mission to slay Medusa. Medusa is the Gorgon, a fearsome being with the power to turn people to stone.
The main characters are Medusa herself, Poseidon, Athena, and Perseus. Medusa is the central figure who undergoes a transformation. Poseidon is the god who causes the initial problem by violating Medusa. Athena is the goddess who punishes Medusa. And Perseus is the hero who kills Medusa.
Perhaps there is a lonely child who then meets some magical creatures. These magical creatures become his or her new friends. The child and the magical friends then have a series of interesting interactions that drive the story forward.