FLAT CHARACTERS
Hrothgar is the aged ruler of the Danes who accepts Beowulf’s help in the first part of the story. His only purpose is to give beowulf his quests and throughout remains unchanged. He does warn Beowulf that the tables can turn at any given point.
Grendel is a flat character as his purpose is to also just further the plot. He lacks depth and change, as he dies the same as he lives, filled with hatred and evil.