Dennis Reynolds is a fictional character from the television show It's Always Sunny in Philadelphia. He is portrayed by actor Glenn Howerton and is known for his narcissistic personality and obsession with his appearance. Dennis is one of the co-owners of the Paddy's Pub, a bar in Philadelphia, and often displays manipulative behavior towards his friends and romantic interests. As a character, Dennis often serves as the voice of reason among his friends, despite his many flaws. He has a complicated relationship with his father, Frank Reynolds, and often seeks validation from others. His antics contribute to the show's dark humor and satirical take on various social issues.