I'm not sure specifically which 'magnifico full story' you are referring to. There could be many stories with that title or related to the word 'magnifico'. Can you be more specific?
Since I don't know the specific 'magnifico full story', I can't determine the main idea. It could be about achieving greatness, heroism, or some other grand concept depending on what the story is about.
The Little Flower Fairy Fairy King's wish was to become a great mage who could control magical elements and possess powerful magical abilities. He hoped to lead his little flower fairy tribe to swim in the magic world and create his own magic miracle.
They bring hope. For example, a terminally ill child who wishes to go to Disneyland gets to experience that magic. It gives them something to look forward to during their difficult times in the hospital.
I'm not sure. It's hard to say if Wish is realistic fiction without knowing more about the story. But usually, if it portrays a world and scenarios that could conceivably happen in real life, it has a chance of being so.