"For some reason Fred and Arnold always have a thing going." -Wilma Flintstone
Arnold the paper boy appears in several episodes of the Flintstones and is known as Fred Flintstone's arch-nemesis in some. He annoys Fred Flintstone every time he appears and even jokes that he and Pebbles Flintstone will get married someday. He is an excellent pin pong and marble player.
Arnold is also very good at scrabble and shows that he is well wiser then Fred is. His age is somewhat unknown, although in the begining of the second season he was known as being 8 year old.