He has a crazy imagination and can make many things up. His biological father hasn't been around much when he was younger and his mother married another man, who Dill said was the reason he ran away. Since he felt that they were having far more fun without him around. He felt he was unneeded.
Dill is one year older than Scout and three years younger than Jem, as was told to us in the first chapter. Because Dill is shorter than Scout and frail in appearance, Scout first thinks he is younger than she is.
Dill Harris was modeled after Harper Lee's friend Truman Capote.
He is described as rather short for even his young age.