Chaos in the Multiverse (Movie)

Main Characters

 * Steve Buscemi as Randall Boggs (Monsters, Inc.) - A lizard-like monster, turned into a long purple haired man and the movie's main protagonist. In the past, he was cruel and evil, hating humans. However, after being banished to their world, he changed in positive ways. Randall was a camper in the religious camp led by Sterling, along with the former students of Monster High. After escaping with his friends, they were determined to stop Sterling's evil plan (which involved turning monsters into spectacles for humans) at all costs. Despite his past, he is no longer power-hungry. He's really helpful and devoted to his friends.
 * Nathan Fillion as Sterling Burnish (Cars 3) - A 36 years old former car, turned into human and the movie's main antagonist. He leads a religious camp for supernatural beings, but his true intention is to create a monster menagerie where humans can gawk at and witness the "monsters." He assumes the guise of a Catholic businessman to hide his sociopathic nature. In reality, he merely uses religion as a tool to gain the trust of young and innocent beings. One evening, while everyone is asleep, Sterling, with the help of his henchmen, administers a substance to the camp residents. Over time, this substance transforms them into true monstrous beings, not only in appearance but in character as well. However, when the administration of the substance was failed, most of the group escapes and he teams up with every villain to find them.
 * Jemaine Clement as Garrott du Roque (Monster High) - A French gargoyle and the movie's deuterantagonist. He was initially a friend of the male students at Monster High until he sided with Sterling. He is power-hungry, cold, and sociopathic, but secretly a polymath and genius. Seeing his ambition, Sterling promised Garrott a substantial amount of money if he joined his side. Garrott has a fondness for fashion design and planned to use the promised funds to start his own business. Due to his perfectionism, he often tries to suit Sterling or other villains. He was Rochelle's ex-boyfriend and later falls in love with Bunny, with whom he has two children. He cheats on Bunny with Sunny, but ultimately chooses Twyla, who has been yearning for him since high school. In the beginning, Garrott is 516 (17) and in the end, he's 527 (28) years old.
 * Justin Timberlake as Arthur Pendragon/Artie (Shrek the Third) - The old future king of Far Far Away and the movie's deuteragonist. He is a friend and teammate of Randall's crew. He is humorous, carefree, yet heroic and devoted. He doesn't feel ready for the throne at all. Initially, he feels repulsed by monsters because of his parents. However, when he learns about Sterling's plan, he tries to help the monsters without his father's knowledge. Meanwhile, his father, Uther does everything to convince Artie to embrace his destiny as a ruler. At first, he is in love with Marceline, but at the end of the story, he marries Aurora and they rule together Far Far Away.
 * Seth MacFarlane as Heath Burns (Monster High) - A flirtatious and loudmouthed fire elemental and the movie's tritagonist. At the begining of the movie, Heath was a member of the camp choir, but was eventually fired, because Sterling thought he sang to off-key. Due to this, he got into an argument with his boss, because his dream was to has a solo in the choir. After this, Sterling's henchmen humiliate and tease him every single day. For a long time, he is afraid to sing in front of others because he believes his voice is bad. However, one day Randall overhears him singing alone in the theater and is amazed by Heath's voice. Despite his qualities, Heath is hesitant to sing in front of many people for a long time. However, when Jimmy Crystal discovers his singing voice, he only sees profit in him. Layla is his girlfriend at first, but at the end of the story, he is dating Starfire.
 * Bobby Cannavale as Jimmy Crystal (Sing 2)
 * Taraji P. Henson as Belle Bottom (Minions: The Rise of Gru)
 * Olivia Olson as Marceline Abadeer (Adventure Time)
 * Ashleigh Ball as Rainbow Dash (My Little Pony: Friendship Is Magic)
 * Lauren Weisman as Luna Mothews (Monster High)
 * Zac Efron as Jackson Rimes/Storm (Cars 3)
 * Barrett Carnahan as Link Evilman (The Thundermans)
 * Will Friedle as Terry McGinnis/Batboy (Batman Beyond)
 * Aaron Taylor-Johnson as Bones (Ferdinand)
 * Lili Reinhart as Ashlynn Ella (Ever After High)
 * Anne Hathaway as Darling Charming (Ever After High)
 * Nick Jonas as Jefferson McDonough/Seaplane (Jumanji: Welcome to the Jungle)
 * Ryan Newman as Allison Woodson (The Thundermans)
 * Lucy Hale as Venus McFly (Monster High)
 * Donald Glover as Marshall Wright/Marshall Lee (Adventure Time)
 * Scott Menville as Robin Grayson (Teen Titans)
 * Hayden Panettiere as Mackenzie Hollister (Dork Diaries)
 * Mike Erwin as Roy Harper/Speedy (Teen Titans)
 * Laura Bailey as Melody Piper (Ever After High)
 * Michael Rosenbaum as Martin West/Kid Flash (Teen Titans)
 * Olivia Munn as Ramona Badwolf (Ever After High)
 * Shannon Chan-Kent as Batsy Claro (Monster High)
 * Timothy Olyphant as Azul (Barbie as The Island Princess)
 * Haviland Stillwell as Raquelle Feeyre (Barbie: Life in the Dreamhouse)
 * Colin Farrell as Chase (Paw Patrol)
 * Yeni Alvarez as Viperine Gorgon (Monster High)
 * Kate Higgins as Frankie Stein (Monster High)
 * Casper Van Dien as Hayes (Totally Spies!)
 * Brad Swaile as Light Yagami (Death Note)
 * Katherine McNamara as Sunny McGrath (OC by Fixies)
 * Jessica DiCicco as Lucy Loud (The Loud House)
 * Evan Smith as Gil Webber (Monster High)
 * Ogie Banks as Clawd Wolf (Monster High)
 * Rahart Adams as Jax Novoa (Every Witch Way)
 * Ashleigh Ball as Keira Hothoof (Barbie The Princess & the Popstar)
 * Chase Elliott as Chase Racelott (Cars 3)
 * Ryan Blaney as Ryan Laney/Inside (Cars 3)
 * Bruce Campbell as Rod Redline/Torque (Cars 2)
 * Kate McKinnon as Lupe (Ferdinand)
 * Eric Idle as Slyly (Rudolph the Red-Nosed Reindeer: The Movie)
 * Sean Maher as Dick Grayson/Nightwing (Teen Titans)
 * Terry McGurrin as Kyle Katz (Totally Spies!)
 * Yuri Lowenthal as Zuma (Paw Patrol)
 * Kelly Sheridan as as Catrine DeMew (Monster High)
 * Cheri Oteri as Aurora Briarrose/Sleeping Beauty (Shrek the Third)
 * Paul Walker as Lars Stevenson (OC)
 * Yuri Lowenthal as Deuce Gorgon (Monster High)
 * Ian James Corlett as Holt Hyde (Monster High)
 * Lou Romano as Jackson Jekyll (Monster High)
 * Taron Egerton as Invisi Billy (Monster High)
 * Wayne Knight as Dash Dawson (Totally Spies!)
 * Rupert Everett as Finnegan Wake (Monster High)
 * Michael Keaton as Chick Hicks (Cars)
 * Owen Wilson as Monty McQueen/Lightning (Cars)
 * Cam Clarke as Romulus Trent (Monster High)
 * Will Arnett as Johnny Spirit (Monster High)
 * T. J. Smith as Seth Ptolemy/Pharaoh (Monster High)
 * William Sadler as Ramone (Cars)
 * Jenifer Lewis as Flo (Cars)
 * Gary Oldman as Lord Shen (Kung Fu Panda 2)
 * John Cleese as Cat R. Waul (An American Tail: Fievel Goes West)
 * Rebecca Black as Robecca Steam (Monster High)
 * Missi Hale as Catty Noir (Monster High)
 * Adam Gregory as Rocky (Paw Patrol)
 * Jason Marsden as Marshall (Paw Patrol)
 * Avril Lavigne as Skye (Paw Patrol)
 * Tom Felton as Draco Malfoy (Harry Potter)
 * Evanna Lynch as Luna Lovegood (Harry Potter)
 * Brendan Fraser as Grayson (The Nut Job)
 * Hynden Walch as Ace of Clubs (Justice League)
 * Jennifer Hale as Spectra Vondergeist (Monster High)

Secondary Characters

 * Jonah Hauer-King as Daring Charming (Ever After High)
 * David Cross as Dexter Charming (Ever After High)
 * Jeff Garlin as Hopper Croakington II (Ever After High)
 * Todd Haberkorn as Sparrow Hood (Ever After High)
 * Jeremy Shada as Humphrey Dumpty (Ever After High)
 * Leah Clark as Ruby Tōjō (Rosario + Vampire)
 * Nathan Fillion as Johnny Worthington III/The Jaw (Monsters University)
 * Billy Crystal as Mike Wazowski (Monsters, Inc.)
 * John Goodman as James Sullivan/Sulley (Monsters, Inc.)
 * Ashleigh Ball as Applejack (My Little Pony: Friendship Is Magic)
 * Andrea Libman as Fluttershy (My Little Pony: Friendship Is Magic)
 * America Ferrera as Clawdeen Wolf (Monster High)
 * Salli Saffioti as Cleo de Nile (Monster High)
 * Tabitha St. Germain as Rarity (My Little Pony: Friendship Is Magic)
 * Danny Jacobs as Mr. Potato Head (Toy Story)
 * Nicole Sullivan as Mrs. Potato Head (Toy Story 2)
 * Taylor Swift as C. A. Cupida (Monster High)
 * Bobby Cannavale as Sergio De Luca (Spy)
 * Jennifer Hale as Mandy Luxe (Totally Spies!)
 * Nick Jonas as Louis/Lou (Uglydolls)
 * Mike "No Name" Nelson as Not Chuck (Cars)
 * James Marsden as Clay Wright (OC by Adventure Time)
 * Betty Gilpin as Miranda Wright (OC by Adventure Time)
 * Robert Pattinson as Cedric Diggory (Harry Potter)
 * Alice Eve as Stella Harper (Winx Club)
 * Michael Peña as Chris Harper (Winx Club)
 * Peter Kelamis as Seymour Crider (Barbie The Princess & the Popstar)
 * Jennifer Hale as Felicity Fences (Totally Spies!)
 * Danny Trejo as Stronghold (Minions: The Rise of Gru)
 * Dolph Lundgren as Svengeance (Minions: The Rise of Gru)
 * Jean-Claude Van Damme as Jean-Clawed (Minions: The Rise of Gru)
 * Lucy Lawless as Nun-chuck (Minions: The Rise of Gru)
 * Gigi Sarroino as Operetta Phantom (Monster High)
 * Chris Pine as Sky Alkyes (Winx Club)
 * Max Greenfield as Mariano Alkyes (OC by Winx Club)
 * Nicki Burke as Mira Shards (Ever After High)
 * Stephanie Sheh as Duchess Swan (Ever After High)
 * Rihanna as Prudence Step (Ever After High)
 * Elizabeth Gillies as Charlotte Step (Ever After High)
 * Daniel Radcliffe as Harry Potter (Harry Potter)
 * Emma Watson as Hermione Granger (Harry Potter)
 * Isla Fisher as Bloom Goosinov (Winx Club)
 * Jenny Slate as Elissabat Abadeer (Monster High)
 * Elizabeth Olsen as Clawdia Wolf (Monster High)
 * Erica Beck as Pearl (Finding Nemo)
 * Daniel Suárez as Danny Swervez (Cars 3) - One of Sterling's henchman, who is looks after Deuce Gorgon.
 * Darrell Wallace Jr. as Bubba Wheelhouse (Cars 3) - One of Sterling's henchman, who is looks after Holt Hyde.
 * Basshunter as Ed Truncan (Cars 3) - One of Sterling's henchman, who is looks after Jackson Jekyll.
 * Ansel Elgort as Flip Dover (Cars 3) - One of Sterling's henchman, who is looks after Clawd Wolf.
 * Will Arnett as Cam Spinner (Cars 3) - One of Sterling's henchman, who is looks after Heath Burns.
 * Barry Humphries as Barry DePedal (Cars 3) - One of Sterling's henchman, who is looks after Gil Webber
 * Greg Cipes as Rich Mixon (Cars 3) - One of Sterling's henchman, who is looks after Slo Mo.
 * Paul Conrad as Paul Conrev (Cars 3) - One of Sterling's henchman, who is looks after Invisi Billy.
 * Noah Klocek as Noah Gocek (Cars 3) - One of Sterling's henchman, who is looks after Hoodude Voodoo.
 * George Nguyen as George New-Win (Cars 3) One of Sterling's henchman, who is looks after Manny Taur.
 * Christian Roman as Chris Roamin' (Cars 3) - One of Sterling's henchman, who is looks after Porter Geiss.
 * Seann William Scott as Spikey Fillups (Cars 3) - One of Sterling's henchman, who is looks after Kieran Valentine.
 * Michael Rutter as Michael Rotor (Cars 3) - One of Sterling's henchman, who is looks after Neightan Rot.
 * James Roderick as Jim Reverick (Cars 3) - One of Sterling's henchman, who is looks after Johnny Spirit.
 * James Patrick Stuart as Richie Gunzit (Cars 3) - One of Sterling's henchman, who is looks after Romulus Trent.
 * E.J. Holowicki as DJ (Cars) - One of Sterling's bouncer, who looks after Seth Ptolemy.
 * Jonas Rivera as Boost (Cars) - One of Sterling's bouncer, who looks after Finnegan Wake.
 * Adrian Ochoa as Wingo (Cars) - One of Sterling's bouncer, who looks after Spelldon Cauldronello.
 * Lou Romano as Snot Rod (Cars) - One of Sterling's bouncer, who looks after Bram Devein.
 * Lyndsy Kail as Kala Mer'ri (Monster High)
 * Aubrey Plaza as Peri Serpentine (Monster High)
 * Cherami Leigh as Pearl Serpentine (Monster High)
 * Timothy Olyphant as Tai (Totally Spies!)
 * Jeff Bennett as J. L. R. Junior (Totally Spies!)
 * Gwen Stefani as Gooliope Jellington (Monster High)

Minor Characters

 * Richard Petty as Strip Weathers/The King (Cars)
 * Austin Pendleton as Professor Wolfgang Otto Zündapp/Professor Z (Cars 2)
 * Ryan Newman as Honey Swamp (Monster High)
 * Hailee Steinfeld as Jane Boolittle (Monster High)
 * Paul Dooley as Sarge (Cars)
 * Charles Fleischer as Boris Goosinov (Balto)
 * Lilly Bartlam as Letty Harper (OC by DC)
 * Kevin Bacon as Balto Goosinov (Balto)
 * Haviland Stillwell as Avea Trotter (Monster High)
 * Daniel Gerson as Needleman (Monsters, Inc.)
 * Cam Clarke as Smitty (Monsters, Inc.)
 * Bresha Webb as Jackie Frost (Ever After High)
 * Evan Smith as Northwind Frost (Ever After High)
 * Steve Susskind as Jerry (Monsters, Inc.)
 * Bonnie Hunt as Mrs. Flint (Monsters, Inc.)