As I don't know the specific story, the main characters would most likely be the kindergarten teacher herself. There may also be the children in her class, such as little Tommy who is always full of energy, or quiet Lucy who loves to draw.
In this story, we have three little pigs. Each pig has its own personality reflected in how they build their houses. Then there's the big bad wolf. He is very cunning and hungry. He sees the pigs as his prey and uses his strength to try and destroy their houses so he can have them for dinner. These characters together create the plot of the story.
To write kindergarten-aged characters well, you need to focus on their simple language and innocent thoughts. Their actions should be driven by curiosity and playfulness.
One way is through repetition. Read the same story multiple times to the children. For example, read a simple story about a little rabbit going to the park every day for a week. The familiarity will help them start to recognize words.
The most prominent character is the little mouse. However, there may be some supporting characters. It's possible that there is a mother mouse who drops the little mouse off at kindergarten. And within the kindergarten, there could be a group of characters. Maybe a wise old owl who comes to visit the kindergarten sometimes to tell stories, and the little mouse's friends like a frisky little kitten and a gentle little lamb.
Often, there are simple characters like a boy or a girl. For example, a boy named Jay who likes to play with a toy that has a long vowel sound in its name, like a plane. The characters are usually kids that kids in kindergarten can easily relate to.
They are probably depicted as cute and innocent. For example, the little mice might be shown with big eyes and small ears, scurrying around in the snow looking for food scraps.
Setting off firecrackers was a traditional custom in the kindergarten during the new year. The kindergarten lesson plan mentioned some activities and teaching methods about setting off firecrackers, such as observing, learning children's songs, imitating movements, etc., so that children could understand the shape and process of setting off firecrackers. At the same time, the lesson plan also emphasized the safety requirements for setting off firecrackers, such as not setting off firecrackers in dangerous areas and not setting off firecrackers without the company of adults. In addition, the lesson plan also mentioned the purpose of setting off firecrackers, such as cultivating children's sense of cooperation, learning unity and humility. In general, the firecrackers in the kindergarten were mainly to let the children understand the shape and process of setting off firecrackers through activities and teaching methods, and to remind them to pay attention to safety when setting off firecrackers.