Kurai is a boy from the 1979 series who made a prominent appearance in only one episode. He is Masashi's best friend, but later got into an argument with him. Nobita mended their friendship using a gadget.
Kurai is a skinny boy who wears rectangular glasses. He is dark-haired and has black eyes, and wears a light lavender-blue pullover over a white shirt. He wears navy-blue shorts and has gray-ish shoes.