Klaus Baudelaire is the middle child of the Baudelaire children. Klaus's sister Violet, is the family inventor, Sunny is the family biter (and later chef) and Klaus is the researcher. He is twelve years old at the beginning of the series, and turns thirteen in The Vile Village.By the end of the series, he is fourteen (fifteen years old if you count in Chapter 14). Klaus is the "bookworm" of the family, and his love of books has often helped him save himself and his sisters. In the books, it is mentioned that his favorite book is The Water Cycle, Volume 196, but he also enjoys books dealing with wars. He remembers literally everything he reads, remembering information which, often helps the Baudelaires to escape from situations that their enemy, Count Olaf, leads them to. As a result of this big appetite for books, he speaks many different languages. Klaus always seems to know the definition of words that leave others surprised though there are certain words that even he does not know the meaning of, such as in loco parentis (mentioned in The Bad Beginning by Mr. Poe) and xenophobe (mentioned in The Ersatz Elevator by Jerome Squalor).In The Austere Academy, Klaus and Isadora, one of the Quagmire triplets, seem to be finding an interest in each other, but in the eleventh book, The Grim Grotto, Klaus receives his first kiss (and first heartbreak) from Fiona, a mycologist.