Glacier is as cold as his name implies, caring for nothing beyond his own personal desires at any given time. He views the inhabitants of the land as little more then walking meat and perhaps, if he's bored, things to toy with. Their overly emotional reactions to him are somewhat amusing and although he honestly doesn't understand why they insist on getting so pointlessly attached to one another the way they flail and moan and scream when he interferes with their lives can make an other wise boring day a little bit less so.
He's not entirely stupid however, like most predators he has a highly developed sense of self preservation and while he might toy with the weak and certainly will fight if he's cornered - he generally prefers to disappear when actual stiff resistance shows its face. Not that it matters to him - he's a wanderer and there are always more to torment on the road ahead, why bother expending energy against strong prey when he could find something which requires a bit less effort down the road.