In the novel, It claims that its true name is Robert "Bob" Gray, but decided to be named “It”. Throughout the book, It is generally referred to as male, usually appearing as Pennywise. The Losers come to believe It may be female after seeing it in the form of a monstrous giant spider that lays eggs.
Throughout Stephen King's It, Pennywise is referred to as a male, but author Stephen King pulled a fast one on readers in the It book ending by revealing the creature's true form was a pregnant spider, implying that it is, in fact, biologically female.
And if his victim believes him to be powerless, he will become powerless. And so the group figures out that their best bet is, essentially, to bully the bully: They mock Pennywise, telling him he isn't scary. Humiliated, Pennywise begins to shrink, transforming into an almost Benjamin Button–like, melted clown-baby.
IT's favorite form on Earth was Pennywise the Dancing Clown (a.k.a Robert Gray) and the closest and truest form was that of a gigantic pregnant spider. From the spider "The Loser's Club" deduced that IT was female (based on ITs ability to reproduce).
However, when confronting Its spider form, the characters find out that It is most likely female, due to Its final form in the physical realm being that of a giant female spider that was also pregnant.
Kersh tells Beverly she's the daughter of a carnival worker who happens to look just like Pennywise. As explained in Stephen King's IT, this man is Bob Gray — and IT, that pesky inter-dimensional force of evil, stole his likeness. For 85-year-old Gregson, the character of Mrs. Kersh was initially even more mystifying.
Pennywise had targeted Georgie when the boy was too young to know any better or fight back. In the clown's most contemptible murders, Pennywise did not rely on visions or fears to lure Georgie in; instead, Pennywise exploited Georgie's trust and turned it into a fatal weakness.
While playing Pennywise in IT and IT Chapter Two, Bill Skarsgard wears a set of prosthetic teeth, for times when the dancing clown really needs to show off his razor-sharp chompers. The problem is, these teeth caused Skarsgard to drool, and not just a little. The teeth caused full-on torrents of slobber from the actor.
Stephen King's IT introduced readers to a one-of-a-kind creature that can take any form, the most common one being Pennywise the Dancing Clown, and as menacing as it is, this creature has one big enemy it's truly scared of: Maturin, the turtle.
If you want to get technical, It is an alien, but It's origin goes well beyond that. It is actually an ancient cosmic deity. A god of destruction, not just of our world, but of multiple worlds and even multiple universes.
Bob Gray, (Pennywise's alter ego) is IT'S human form. The thing is now is that IT was NEVER human. Bob Gray was a clown called Pennywise that travelled in the circus with his daughter, Kersh.
While it's unclear if it was ever shot, a deleted scene from the IT 2017 script saw Pennywise actually eat a baby in front of its mother. There are lots of disturbing scenes in Stephen King's original IT novel. Anyone who's read that gargantuan tome can readily attest to that fact.
The backstory of Pennywise is tied to an ancient cosmic entity referred to as the "It" or the "Eater of Worlds." This entity is from another dimension and has existed for an extremely long time. It comes to Earth approximately every 27 years to prey on the children of Derry.
Pennywise is a powerful being. It's one of the demon elementals. It exists outside of the Dark Tower. Movement Speed / Reaction / Perception: Irrelevant: As a demon elemental, Pennywise exists outside of time and space.
Georgie Elmer Denbrough is a fictional character created by Stephen King from his 1986 epic horror novel It. Georgie is the younger brother of Bill Denbrough, and falls prey to Pennywise the Clown. He is used by Pennywise to taunt Bill throughout the novel.
Marsh and Beverly occurs in the novel, King makes it clear that Bev's father is actually possessed by It. It takes the shape of whatever its target fears the most, so Mr. Marsh is used as a conduit to embody Beverly's worst fears of abuse.
The novel explains that IT landed on Earth during an asteroid impact and established itself under the land Derry would be later built on, and initially preyed on indigenous tribes. From that point of view, IT/Pennywise would be billions of years old, but his clown shape wouldn't be that old.
A neighbor witnesses his disappearance, but the fact his body is never found gives Bill hope Georgie somehow survived. Pennywise prays on this in the film, using that hope to lure Bill in the finale. Bill later finds the tatters of Georgie's coat and finally accepts his brother is gone.
In the final battle between the Losers and the clown, Pennywise appears to Bill as Georgie and begs for him to take him back to the family home and out of the sewer. The scene is filled with intense emotions as Bill shoots him in the head, seeming to know definitively that Georgie was not his real brother.
IT, Georgie's fear is IT, an evil creature in his basement that smells of garbage and wants to pull him through the basement stairs and eat him(this creatureis entirelymade up).
Pennywise the Clown is not a clown at all. The Pennywise the clown origin story sees an ancient, evil being that is perhaps as old as the universe itself. In the novel, however, the entity IT/Pennywise has a real name — Bob Gray. Bob Gray isn't human, however, and shares the same origin as IT.
In the novel, It's origins are nebulous. He took the form of a clown most frequently, Mr. Bob Gray or Pennywise, but his true form is an ancient eldritch entity from another universe who landed in the town that would become Derry by way of an asteroid and first awoke in 1715.
