Filler

A person who exists to take up space. No one knows who they are or has interacted with them. Typically comprise 90% of a large college/university. Seen in smaller portions in high school and at work.

Person 1: Hey do you know, John Smith, that guy from our history 101 class?
Person 2: No, he sounds like filler. I've never heard of him.

Person 3: Who?