Carlo Zen is a Japanese author and novelist, best known for his work in the light novel genre. He gained popularity for the series Youjo Senki, also known as The Saga of Tanya the Evil, which combines elements of fantasy and military strategy. The story follows a salaryman reincarnated as a young girl in a war-torn world, exploring themes of power, morality, and survival. In addition to Youjo Senki, Carlo Zen has written other works that often feature intricate plots and well-developed characters. His writing style is characterized by a blend of humor and serious themes, appealing to a wide range of readers in the anime and light novel communities.