Wilbur: Wilbur is a cute little pig. He was born in a barn. He is a happy, innocent and kind animal. He likes to make friends with other animals, especially with Charlotte. Wilbur's greatest wish is to be a good pig and be able to run freely outdoors. However, he was sold to Fern's uncle and had to live in Horn's barn. With the help of Charlotte, Wilbur finally realized his wish and got freedom and happiness.
Charlotte: Charlotte is a smart, brave and kind spider. She lives in the barn there. Charlotte has a special ability, that is, she can weave a web to predict the future. She established a deep friendship with Wilbur, and in order to help Wilbur realize his wish, she wove many magical nets, such as "Ace Pig", "Great", "Brilliant" and "Humility". Charlotte's kindness and courage inspired the courage and hope of other animals, and also helped Wilbur overcome difficulties and finally realized his dream.
In a word, Wilbur and Charlotte are the protagonists and key characters in the novel respectively, and their friendship, courage and love are the themes in the novel.