Buck Russell is a fictional character from the 1989 comedy film "Uncle Buck," directed by John Hughes. He is portrayed by actor John Candy, who brings humor and warmth to the role. Buck is an unconventional, carefree bachelor who unexpectedly becomes the caretaker for his brother's children. Throughout the film, Buck's unique parenting style and laid-back attitude lead to both comedic situations and heartfelt moments. His character highlights themes of family, responsibility, and the importance of being true to oneself, making him a memorable figure in comedy cinema.