Frank Reynolds is a fictional character from the television show It's Always Sunny in Philadelphia. He is portrayed by actor Danny DeVito and is known for his eccentric personality and questionable morals. Frank is the co-owner of the Paddy's Pub and often engages in outrageous schemes with his friends. As a character, Frank is characterized by his love for money, food, and indulgence. He frequently displays a lack of concern for social norms and often acts impulsively. His antics contribute to the show's dark humor and satirical take on various themes, making him a memorable figure in modern television.