Pennywise and/or It is the villain in the film. The character is raceless and is from an alternative universe. It does not always live on Earth. Pennywise comes to Earth once every 27 summers. Pennywise comes to Earth with a daunting task of eating children. Pennywise is primarily a clown but can take the form of any scary thing. Its only weakness is that it can not eat children unless they are scared.
Bill is the main character of the film. He is an outcast who just finished middle school. He was excited to hang out with his friends this summer. But, he can't help but be upset knowing his little brother Georgie was killed earlier this year. He hates how the community will not give him and his deceased brother justice. But he also takes responsibility for his brother's death as well. During his summer, him and his friend all see a clown (Pennywise) that terrifies them. He comes to the realization that the clown killed Georgie. So he and his friends try to stop him during the summer since their local law enforcement will not.
Plays Beverley Marsh
Beverley, like Bill, is an outcast who is bullied in school. But unlike Bill and his friends, she is already in high school. Because she does not fit in with the girls (and people in general), she hangs out with Bill and his friends. She helps Bill and his friends try to hunt down Pennywise as she also sees that no good dancing clown. It also serves as a distraction or an escape from her abusive father.