Gordon is pompous, self satisfied and large. He’s a blue mainline engine with a coal tender  (identical to Henry) who pulls The Express and believes shunting is beneath him. He’s the fastest engine on Sodor and will jump at any chance to go faster. 

As one of the oldest children in the playground he mimics adult behavior by not simply being vain, but by believing he isn't, thinking of himself as 'important' and ‘responsible’. He's an outstanding example of Big Fish Small Pond. 

