J.J. Evans is a fictional character from the television show Good Times, which aired from 1974 to 1979. He is portrayed by actor Jimmie Walker and is known for his catchphrase, "Dy-no-mite!" J.J. is the youngest son of the Evans family, living in a Chicago housing project. His character often provides comic relief while also addressing serious social issues faced by his family. J.J. is an aspiring artist and often dreams of becoming a successful painter. Throughout the series, he navigates the challenges of growing up in a low-income environment, balancing his ambitions with the realities of life. His character is significant for representing the experiences of African American families during the 1970s.