Jim Gordon

Career
Jim Gordon is a police officer who rises from the ranks of detective to commissioner within the time of the trilogy. He acts as the only incorruptible policeman who the Batman can trust.

Batman Begins
At the end of the film, Batman gives Gordon the Batmobile so that he can take out some of the columns which support the monorail.

The Dark Knight
In The Dark Knight, Batman almost exclusively works with Gordon and the major crimes unit. Gordon fails to save Rachel when she and Harvey are kidnapped by the Joker. Batman also only trusts Gordon's unit to handle the Joker and his gang when they are imprisoned.

The Dark Knight Rises
Gordon still fights for the people of Gotham even when he knows he could die to Bane and his militants.