Pennywise

It, also known as Robert "Bob" Gray, commonly known as Pennywise the Dancing Clown, is the titular main antagonist of Stephen King's 1986 horror novel It and its adaptations. The character is an ancient, trans-dimensional malevolent entity who preys upon the children (and sometimes adults) of the fictional town of Derry, Maine, roughly every 27 years, using a variety of supernatural powers that include the abilities to shapeshift and manipulate reality. Over the course of the story, the character primarily appears in the form of Pennywise the Dancing Clown. A group of Derry children who call t