What is charlie gordon like?

Charlie Gordon is a mentally challenged man in the story "Flowers for Algernon" by Daniel Keyes. He is initially naive and optimistic, eager to learn and make friends. After undergoing an experimental surgery to enhance his intelligence, he becomes highly intelligent, but struggles with the complexities of human relationships and ultimately faces profound loneliness and loss as his cognitive abilities begin to decline. His journey highlights themes of intelligence, humanity, and the ethical implications of scientific experimentation.