Klaus Baudelaire is a fictional character from the book series A Series of Unfortunate Events by Lemony Snicket. He is the middle child of the Baudelaire orphans, known for his intelligence and love of reading. Klaus often uses his extensive knowledge to help solve problems and protect his siblings, Violet and Sunny. Klaus is characterized by his resourcefulness and quick thinking. He frequently references books to find solutions to the challenges the orphans face, particularly against their nemesis, Count Olaf. His dedication to his family and his quest for justice are central themes in the series.