Nellie Oleson is a fictional character from the book series "Little House on the Prairie," written by Laura Ingalls Wilder. She is portrayed as a wealthy and spoiled girl who often bullies the main character, Laura Ingalls. Nellie's character represents the challenges of childhood friendships and social class differences in the late 19th century American Midwest. In the television adaptation of the series, "Little House on the Prairie," Nellie is played by actress Alison Arngrim. The show further develops her character, showcasing her growth and eventual friendship with Laura. Nellie's story highlights themes of rivalry, redemption, and the complexities of growing up.