Heidi is a young girl who lives in the Swiss Alps with her grandfather, known as Alm-Uncle. She enjoys the beauty of nature and the company of animals, especially her friend Peter, a goatherd. Together, they explore the mountains and share adventures, forming a strong bond of friendship. Peter is a kind-hearted boy who takes care of his family's goats. He often visits Heidi and helps her with daily tasks. Their friendship is central to the story, as they support each other through challenges and enjoy the simple pleasures of life in the Alps.