IT

It (Referred to as IT, or Pennywise) is an ancient alien/eldritch monster and the title character and main antagonist of the 1986 novel the same name (and subsequent television and film adaptations). It is a shapeshifting creature known as a Glamour and is billions of years old. Although it lived on planet Earth for many years, it originated in a void/dimension outside the regions of space known as the Macroverse. Since its true identity is unclear, due to its shape-shifting abilities making its real name and species unknown, the creature is just named IT.

Why IT Rocks (No Pun Intended)

 * 1) IT is one of Stephen King’s most diabolical and memorable antagonists.
 * 2) It’s expressions and characteristics are ungodly and unpredictable, showing how terrifying IT can be.
 * 3) It takes many forms of people’s worst fears, mainly it’s most memorable form, Pennywise the Dancing Clown.
 * 4) Actors Tim Curry and Bill Skarsgard did fantastic jobs at portraying a live-action version of Pennywise, giving Skarsgard a starting point for IT's portrayal.
 * 5) IT steals the show most of the time with It’s goofy yet frightening  behavior as Pennywise, such as the Pennywise Dancing moment.
 * 6) Has many memorable quotes, such the unforgettable “You’ll all float down here.” line.
 * 7) It’a gender, whereabouts and origin are hidden with the a deadly ball of lights known as the Deadlights, showing it truly remains a mystery, making it even more of a terrifying figure.

The Only Bad Quality

 * 1) While his 1990 design is pretty terrifying, it makes It look a lot more like a children's clown at a birthday party, in comparison to his 2017 counterpart.