Kevin Wendell Crumb is a fictional character from the movie Split, directed by M. Night Shyamalan. He is portrayed by actor James McAvoy and is known for having a dissociative identity disorder, which causes him to have multiple distinct personalities. One of his most prominent identities is The Beast, a powerful and dangerous persona. In the film, Kevin kidnaps three teenage girls, leading to a tense and suspenseful storyline. His various identities, including Dennis, Patricia, and Hedwig, each have unique traits and characteristics, contributing to the complexity of his character. The film explores themes of trauma and identity through Kevin's experiences.