There is an argument raised about whether Grendel is the civilized or Hrothgar is the civilized character in the novel. Not only do both characters illustrate how they live a civilized life, they both demonstrate how they live an uncivilized life. The use of naturalism in the novel shows the civilized side to Grendel's approach to life. He uses the forest as his dwelling and continues to guard it from Hrothgar during the entirety of the novel. However, Grendel also shows how he can be uncivilized by killing people and animals that he feels are inconsequential. Sometimes he leaves them withering away, instead of killing them all the way.
To be civilized is to live in a cultural state of being. Grendel is an animal born into the world by his mother. Instead of living in a cave, which an uncivilized animal would live, he resides in the forest. The forest is a place where most all animals live in harmony with one another. Grendel feels he has to protect his "home- or the forest, from intruders, such as Hrothgar and other threatening animals. Grendel shows traits of humanity such as, protecting his home and his values from threatening objects. " I staggered out into the open and up toward the hall with my burden, groaning out, mercy! Peace! I sank to my knees, crying friend! Friend! (pg 51 & 52)- However, the difference between humans and Grendel is the ability to reason and to find the difference between who is a "threat- and who is not. This is what makes Grendel uncivilized.
Grendel has a sadistic streak in his personality. He shows two different sides during the story. Early in the book we tend to see his side of compassion for his mother in a sort of baby form. He cries and whines for his mother. Later in the book, we soon learn that Grendel also kills and is not ashamed by this. Many times he finds himself imaging killing people who have had no bearing on his life. "It is a matter of fact that I have never killed a dear in all my life and never will.