Charlie Kelly is a fictional character from the television show It's Always Sunny in Philadelphia. He is portrayed by actor Charlie Day and is known for his childlike demeanor and quirky personality. Charlie works as a janitor at the Paddy's Pub, a bar owned by his friends, and often engages in bizarre schemes and antics. Despite his lack of intelligence and social skills, Charlie is fiercely loyal to his friends, including Mac, Dennis, Dee, and Frank. He has a unique passion for music, particularly his love for the piano and his homemade songs. His character adds a comedic and unpredictable element to the series.