Astro Boy 2009 has loads — Zane, Widget, Grace, Sludge, and Orrin, to name the more appealing ones — as well as replacing Cathy with Cora.
The Night Fury dragons are actually found only in the film adaptation of How to Train Your Dragon. In the books, Toothless was much smaller and looked more like a Terrible Terror dragon than a Night Fury dragon.
Li Mei, the Mandarin's descendant from The Invincible Iron Man. Though a similar character named Sasha has been introduced in the comics as the Mandarin's daughter, it's unclear if the two are intended to be the same person.
The 1991 film adaptation of The Little Engine That Could, we get Chip the bird (a friend of the title character), a doctor engine, a Jerkass control tower, and a human boy's skeptical older sister.
Mika Milovana, princess of Dale in Gene Deitch's 1966 adaptation of The Hobbit.
Gopher in Disney's Winnie-the-Pooh cartoons. This gets lampshaded several times, the subtlest probably being:
"Here's my card! I'm not in the book, but I'm at your service!"
Many of the characters from the Tinker Bell movies were never in the books. Most notably are Periwinkle, Milori and the rest of the ice fairies, Zarina, and Nyx, who never existed in any form or were ever mentioned in the books.
Most of the cast of Beauty and the Beast. If we're being generous, the Beast's servants were in some versions of the original fairy tale as various unnamed, sometimes invisible servants employed by the Beast. If we're being especially strict, then Belle and her father Maurice are also Canon Foreigners based on their differences from the original story: the heroine's father is typically a merchant, not an inventor, and the protagonist herself is not only generally unnamed but also lacks the characterization of being an avid reader. Gaston and Le Fou are whole-cloth, though, and have no equivalents in most pre-Disney versions of the story (Gaston, however, does somewhat resemble a similar Romantic False Lead in the Jean Cocteau version).
The movie has a great gray owl named Allomere, who has never appeared in the Guardians of Ga'Hoole books. He is not only a guardian at the Great Ga'Hoole Tree, but he's also a traitor working with Metal Beak to destroy the Guardians.
There's also the Echidna, another original character, who guides Soren and his Band across the Sea of Hoolemere and appears to "foretell" stuff bound to happen.
Marvel Rising: Secret Warriors introduces Gwen Stacy's childhood friend Kevin, who fills the same role Peter Parker did in that he's her best friend who knows she's a hero, that unfortunately gets killed off, filling the same role Peter usually does in Ghost Spider/Spider Gwen stories.
The Lion King (2019) features an elephant shrew, a bush baby, a bat-eared fox, an aardvark, dik-diks, and a flock of guinea fowl living with Timon and Pumbaa in their jungle, as opposed to just Timon and Pumbaa in the 1994 movie.
Lucky Bat is a character in the movie who never appeared in the toyline. He blends the basic idea of the original toyline's Ice-Bat (who was a main character in the franchise during the toyline era) with personality aspects of Ninja Batty Shogun (a mystical ninja-like character with Asian influences). Despite Lucky Bat fulfilling these roles, Ice-Bat and Ninja Batty Shogun still exist in the franchise, with Ice-Bat making minor appearances as a citizen in the movie, while also changed into a female character, and both still remaining in the movie's toyline.
All of the Perfection Dolls were created for the movie. Before their creation, only the Uglydolls existed in the toyline's canon as the only living creatures in the Uglyverse.
The first movie introduces Shiori Akino, Light's classmate and girlfriend. Word of God is that she was created to highlight Light's more ruthless and negative aspects, since he arranges her death as part of his plan.
There are quite a few more Gryffindors, and students in general, in Harry's year in than there are in the books. For example Bem, a Gryffindor boy who only appears in the third movie while there were only five boys (Harry, Ron, Neville, Dean and Seamus) sorted into Gryffindor in 1991 in the books.
Tom Sawyer and Dorian Gray in The League of Extraordinary Gentlemen. Although those characters were alluded to in the original material, they were never seen and certainly were not main characters. The film also features an Expy for the Invisible Man because they couldn't get the rights to the H.G. Wells character.
Clue had Wadsworth the butler. Wadsworth can also be considered a result of Third-Option Adaptation; that way, at least one of the endings - the last to be shown on editions that show all three in sequence, implying its canonicity - would have a culprit who wasn't one of the playable characters.
Robert Hammond, a U.S. Senator and the father of Hector Hammond, in Green Lantern.
In Supergirl, all of the major characters save Supergirl herself, her parents, Jimmy Olsen, and Lucy Lane. Another (sort of) exception is Principal Danver. In the comic book, the Danvers are Supergirl's foster parents on Earth. Perhaps this character (or one of his relatives) was supposed to adopt Supergirl in a sequel that was never made.
In the first one, Blade and Deacon Frost were the only comic characters. Blade's quasi-love interest and all of the named vampires were created for the movie.
In the second, Blade was essentially the only comic character to be featured in the movie. While there was a team called the Blood Pack in the original material, the individual members featured in the movie were new.
Like the Blood Pack, the third film featured a team of vampire hunters that were lifted from the comics called Night Stalkers, but Hannibal King was the only member taken from the comic series. Whistler did not have a superhero daughter and the rest were completely new characters. Also, while Marvel Comics did have a version of Dracula who has fought Blade many times, this film featured a version that was taken in a different direction.
In the comics, Whiplash became a Legacy Character after the death of Mark Scarlotti. The Big Bad of Iron Man 2, despite being the MCU's version of Whiplash and having the signature weapon, is a new character named Ivan Vanko.
Thor has Jane's buddy Darcy. There was also Erik Selvig, who has since become a Canon Immigrant.
While the Strategic Scientific Reserve is made up of established comic characters and is one of the MCU's in-universe predecessors to S.H.I.E.L.D., the organization itself fits this trope, as it was created solely for the movie.
The Transylvanians fromThe Rocky Horror Picture Show. The original stage version used "phantom" back-up singers who weren't part of the story, not party-goers.
Colonel Hardy and General Swanwick don't exist in the comics Man of Steel is based on. Though Swanwick might be considered a stand-in for Lois Lane's father General Sam Lane, who filled the military brass role in Superman: Secret Origin. In addition Colonel Hardy is referred to by the codename "Guardian" near the end of the movie. Colonel Hardy is seemingly a replacement for Jim Harper, aka Guardian.
Although Toho's Godzilla franchise features plenty of giant mutant insectoid monsters, the makers of this film decided to introduce the Mutos as an original set of this sort of creature for Godzilla to fight.
The Teaser Trailer Monster only appeared in the SDCC teaser trailer, but did not appear in the final film. There is, however, a small nod to it in the form of a peculiar and brightly coloured millipede in the Janjira zone.
Millicent and her explorer father in Paddington, who never appeared in any of the books is brought in to make an action/thriller plot.
The main premise of Scooby-Doo 2: Monsters Unleashed is about the gang battling the costumes of some of their past foes brought to life. Most of the costumes made into real monsters originated from the old Hanna-Barbera cartoons, but the one exception is the Cotton Candy Glob, who was apparently created for the movie and never appeared in any of the cartoons.
In The Magnificent Seven, the American remake of the Japanese film Seven Samurai, two of the samurai, Katsushiro and Kikuchiyo were rolled into one of the gunfighters, Chico. This left a spot on the team for a completely new character: the paranoid and neurotic gunfighter Lee, who actually gets more of a character arc than some of his comrades who are in both films.
Half the main cast of the 1959 Journey to the Center of the Earth are this trope, allowing the addition of a female character, Team Pet, and villain to what was originally an all-male party.
The 2015 film adaptation of Macbeth adds two witches (a child and an infant), a child soldier who Macbeth gets attached to (and who dies during the battle against Macdonald), and a child for the Macbeths (who died prior to the events of the movie).
A new character, Edgar, replaces the role that Edward (the Dauntless guy who is forced to go factionless in Divergent) would take in The Divergent Series: Insurgent and beyond. Unlike Edward, though, Edgar survives all the way to the middle of The Divergent Series: Allegiant (he's actually the one who kills Tori), while Edward dies just a few pages into Allegiant.
Warcraft (2016) adds Taria Wrynn to have more women on screen and explain how king Llane has a childnote To quote one online commenter, "it used to be a commonly accepted fact that the Wrynns replicate asexually", and Callan, Lothar's son, to propel Lothar's character development.
The Thing (1982) adds several new characters to the original cast of Who Goes There? - Windows, Fuchs, Childs, Palmer, and the Norwegians are not in the short story.
Whilst The Scorch Trials revealed that in addition to the Gladers from the The Maze Runner, there was also a second group of Gladers in a different maze consisting of a group of girls and one boy. The film goes further adding in multiple groups of Gladers who weren't in the books.
Mary Cooper; a scientist working for The Right Arm and had previously been a part of WCKD, is also a film only character.
Mamma Mia! Here We Go Again has Donna's mother, Ruby, who is a completely new character not present in the original play or the first film. In fact, she was implied to be dead in the first film. ("Somebody up there has got it in for me. I bet its my mother.")
Aladdin (2019) features Princess Jasmine's servant Dalia who becomes a love interest and eventual wife of the Genie as well as Prince Anders and Hakim who take on the roles of Prince Achmed and Razoul, respectively.
Wonder Woman (2017): Steve Trevor's team of Sameer, Charlie, and "Chief" (Napi) are original to the film, with their closest comic book counterparts as a not officially approved semi-rogue semi-commando sort unit being Etta Candy's Holliday Girls, who are of course all women and led by Etta rather than Steve. The three later became Canon Immigrants when they were introduced in Wonder Woman (Rebirth).
The Witches (2020) has a third child who was turned into a mouse, a girl named Mary who is the unnamed protagonists mouse he received as a pet, in the book and original film he had two non enchanted mice which he named William and Mary.
Frank Charney, Little Miss's husband, is implied to exist in the original, but never appears on-screen. Here, he is the cause of Andrew becoming the Romantic Runnerup for the Little Miss and Andrew relationship. Frank and Amanda divorce.
Portia, Little Miss's granddaughter, doesn't exist in the original novelette or the novel. The Martin family ends with the death of Little Sir (named George in the original and Lloyd in the film).
Rupert Burns, Andrew's partner in developing prosthetics, was added to the film in order to have someone that Andrew can work with and explain his actions to the audience. His role is more expanded even compared to Alvin Magdescu's role in the novelization, as Rupert is an equal partner in the creation of prosthetics, suggesting as many modifications as Andrew does.
Galatea, a Fembot version of the NDR114 series, is added to the film to create a Foil for Andrew. She's a robot that didn't develop a personality like Andrew, she only had one programmed in.
The Hound of the Baskervilles (1983): BRIAN BLESSED's character Geoffrey Lyons never appears in the novel. In this film version, Lyons is presented as an imposing suspect who is at one point falsely imprisoned for strangling his wife. Holmes' solution to the case ultimately frees him.