TinTin is the hero of the series.His goal in the books is to solve the mysteries he encounters on his travels.
Captain Haddock is an old seafaring captain who TinTin meets in The Crab with the Golden Claws.The two men become friends for life.
Calculus is that "almost deaf" professor whose meet in Red Racham's Treasure and whose inventions are often disliked by Captain Haddock,but Calculus thinks he loves them.
Snowy is TinTin's trusty dog and companion in all his adventures.
Thomson and Thompson are those two clumsy detectives TinTin meets in Cigars of the Pharaoh,who have made a habit of getting in TinTin's way.