Will Henry is a fictional character from the book series titled The Monstrumologist, written by Rick Yancey. He serves as the assistant to the main character, Dr. Warthrop, a scientist who studies monsters. The story is set in the late 19th century and explores themes of horror, science, and morality. As a young boy, Will is curious and brave, often facing terrifying creatures alongside Dr. Warthrop. His character development throughout the series highlights the struggles of growing up in a world filled with danger and the complexities of human nature.