Pennywise

IT, also known as Pennywise the Dancing Clown, is the titular main antagonist of the horror novel IT and its subsequent adaptations. It is a shapeshifting cosmic entity that feeds on human fears, and hunts and devours human children every 27 years.

He has served as a character in the Video Game Rap Battle series, having taken on The Joker thus far.

Trivia

 * The design used in the rap battle was that of the 2017-2019 films.