Fairy tale is a literary work in which real and supernatural world come together without making it odd. In it, the image of the world is built on unreal, supernatural elements and characters. This thesis studies the donor characters who appear in Grimm's fairy tales. Therefore, the research was conducted on the book Bajke (2011.) by Jacob and Wilhelm Grimm, the best-known storytellers. The book is published on the website elektire and has twenty-seven fairy tales. However, the donor characters appear in twenty-two fairy tales, wherewith their good deeds they affect the development of the story and the happy ending. The donor characters may appear as supernatural beings, humans and animals. Yet, there are peculiar cases where the hero is also the donor character. Next, male characters are more likely than female characters to be the donor character. When it comes to fairy tales with supernatural beings, ten fairy tales use wondrous powers to aid the hero. Moreover, all donor characters help the heroes, which is characteristic for fairy tales, although the help is also offered to the villains.