Happy is a fictional character from the comic book series and television adaptation titled Happy!. He is depicted as a small, blue, winged horse with a cheerful demeanor, who serves as the imaginary friend of a young girl named Hailey. In the story, Happy teams up with a disgraced ex-cop named Nick Sax to rescue Hailey from a dangerous situation. The series blends dark humor and action, showcasing Happy's optimistic personality contrasting with the gritty world around him.