Attributes make up the core of a Champion's power and determines Role. For example, a Tank would have high Constitution while a Healer may have high Willpower.
When at level 20, a Champion without any Equipment or Skills to boost Attributes would have 110 Attribute Points. Although you cannot change the base value of a Champion's Attributes, you are able to add the remaining amount of Points to whichever Attribute you so wish.
The base value of a Champion's Attributes are shown below:
Warrior: 12 Strength, 11 Constitution, 10 Agility, 10 Willpower, and 10 Magic
Mage: 12 Magic, 11 Willpower, 10 Agility, 10 Strength, 10 Constitution
Rogue: 12 Agility, 11 Willpower, 10 Strength, 10 Constitution, and 10 Magic