Answer:
Grendel acts in a wild and malicious way, causing evil and sadness, besides being a creature distant from God, created by sin. This makes him a villain and an antagonist to Beowulf.
Explanation:
Grendel was created after Cain killed Abel. He is a direct descendant of Cain, becoming someone away from God, without honor and with the mark of sin in his blood. This makes Grendel to represent everything that is bad, such as sin. Grendel represents evil, destruction, death and suffering, moreover he is a creature that acts in an irrational, wild and unscrupulous way. Unlike Beowulf, who is an honorable hero who promotes good.