Bergthor's just out to have a good time. Sometimes, that's not so bad-- he's a nice guy. Unfortunately, sometimes, he's drunk, and that's when he forgets just how big and strong he is, and things get broken. Like buildings.
Bergthor swings a gigantic hammer around, but unlike his thunder-god namesake, he's attuned to the element of ice, freezing enemies solid and then shattering them. He'll attach himself to a friend, get them into trouble through sheer good-natured fun-seeking, and then move heaven and earth to help them get out of it.