There are three main events in the novel, To Kill a Mockingbird, where Atticus shows these characteristics. The first one is when he sits outside the jail to protect Tom Robinson from a lynch mob. He knows that there is a lot of unrest in town over the trial, and Atticus is willing to risk his life for Tom. Another time Atticus shows courage and integrity is when he shoots the rabid dog who has wandered into town. The dog is a symbol of racism, "Maycomb's disease", and Atticus symbolically stands up to the racism by shooting the diseased dog. In its literal sense, Atticus saves the town from a crazed, vicious dog.
The most important event that shows Atticus's character is when he defends Tom Robinson for the rape of Mayella Ewell. Atticus is asked to defend Tom because he will give Tom the unbiased help Tom needs to beat the charges. Unfortunately, the racist attitudes of Maycomb defeat Atticus's attempt to prove Tom innocent. Tom is sent to jail where he is shot trying to escape. It is Atticus who goes to Tom's home to tell his wife that Tom is dead.
As a character, Atticus embodies the principles of loyalty, integrity and courage in the way he respects and treats people throughout the novel.