Barbarians are savage and untamed villains. They are often cruel, dangerous and bloodthirsty with a desire to rule by force alone. Although stereotypically strong, they don't have to be strong to qualify. Basically, a barbarian fills the role of a semi-feral being intelligent enough that they still retain some humanity but are still ruled mainly by base instincts such as war and aggression.

A barbarian can also be a rude, violent and sanguinary individual. In some cultures, they are known as "ogres" (a reference to the mythical monster of the same name).

Another common trait of a barbarian is strong anti-intellectual sentiment, though this is not a universal trait as some barbarians can be intelligent, even cunning.

In other words, Barbarians do not listen to reason whenever heroes say they should.

Give me more blood! Let it shower more Dragon's blood!
~ Acnologia going berserk