Humans: Curiosity leads them to interact with most other races. Their communities are tightly-knit, and they are often very superstitious. Traders and merchants, often get themselves into trouble.
Elves: Scornful of anything not Elven. Believe most other races to be barbaric, and their own race to be the "dominant" race. Like to spend time writing poetry and music and the like. The most "artistic" of the races, but also the most snobbish and more difficult to deal with than humans. Easily angered.
Dwarves: Xenophobic, mistrusting of other races. They don't usually leave their mountain fortresses, so they are rarely the aggressors in a conflict. Have a strong sense of duty and would generally rather die than suffer dishonor. They hold grudges for a long time. However, they realize the benefits of trade and are usually open to peaceful interactions with other races, providing that they have something to gain.
Goblins: Crafty and dangerous. Deceitful. Unpredictable. Any negotiations or agreements with them must be enforced by direct force. Shunned by other races, hated by Dwarves.
Orcs: "Barbaric." Their strong traditional sense of honor and glory in combat makes other races see them with distaste. They see other races as weak and unfit to live. Very good at starting wars.