"Simple, deliberate, stubborn, and hulking."
Half-giants are widely known for their physical abilities, and for their ability to deal heavy damage to foes during combat, but they are typically shunned by many people for their hulking figures and often simplistic views on life and goals. This is not to say that half-giants are stupid, as many of them, especially storm half-giants can have great intellect, but because of their ability to muscle through problems, they typically do not worry too much about details, and feel they can just plow right on to their goals.
The main thing a half-giant wants in life is acceptance from giants, humans, or both. Some Half-Giants attempt to gain acceptance by accomplishing heroic deeds. Half-giants who are raised among the giant culture will attempt to gain acceptance by honing their combat skills to perfection. Adventuring typically allows them to hone their combat skills and accomplish heroic deeds at the same time, so most Half-Giants who get the chance to will gladly join an adventuring party.