Atreyu is a fictional character from the novel "The NeverEnding Story," written by Michael Ende. He is a young warrior tasked with saving the land of Fantastica from a mysterious force known as the Nothing. Atreyu is brave, determined, and embodies the qualities of a hero as he embarks on a perilous journey. In the story, Atreyu is chosen by the Childlike Empress to find a cure for her illness, which is linked to the decay of Fantastica. Throughout his quest, he encounters various creatures and challenges, showcasing themes of courage, friendship, and the importance of believing in oneself.