Character History and Becoming the Batman
As a small child(about 6 or 7) Bruce Wayne is returning from a movie theatre when his parents are shot by thieves who kill them for their money and run away, leaving Bruce unharmed. About 15 or 20 years later, Bruce Wayne becomes the Batman to try and avoid the tears and bloodshed that he experienced as a child.
When suited up as Batman, Bruce doesn't usually show much emotion, usually just smiling a little or grunting in pain and occasional talking usually if talked to first. An interesting thing about Batman, is that he cares for the villains he fights and believes in a brighter future for them. In The Batman vs Dracula movie; Bruce is upset and a little depressed when Joker is believed to be dead.