Francis Junior, called Junior for short, is the son of Francis and one of his many liaisons, an unnamed she-cat.
Junior is identical to his father, with the same black fur, white socks, and green eyes. He is simply younger and not so roughed up as Francis is, the result of being involved with murder scene after murder scene.
Junior is said to be a lot like Francis in personality, his intelligence in particular. However, Junior is more spry and impulsive, while Francis was always more relaxed, reserved, and thought things through before making a move.