!!'''Reynold and Wren'''
[[quoteright:165:https://static.tvtropes.org/pmwiki/pub/images/wrenreynold-w350-h150_3864.png]]

Twins and main characters. The player chooses which of the two they want to play (the only real difference being the gender), and the other is kidnapped by the monsters, leading to the game events. Voiced by Sloane Letourneau (Reynold) and Gabriella Graves (Wren) in the animated series.

* BadassAdorable

* HalfIdenticalTwins
* PerkyGoth: The siblings obsession with Halloween and Wren's clothing choice seem to imply this.
* SiblingRivalry
* SiblingSenioritySquabble: Wren is exactly 10 ''minutes'' older than Reynold.
* StaticRoleExchangeableCharacter: You choose one to play as, the other is the DamselInDistress[=/=]DistressedDude. Or just a party member in ''Grubbins On Ice'' and ''2''.
* TookALevelInBadass: The sibling who got rescued in the main game is promoted to third party member in ''Grubbins On Ice''.

!!'''Everett'''
[[quoteright:116:https://static.tvtropes.org/pmwiki/pub/images/everett-w350-h150_2198.png]]

The first friend the player sibling makes in the adventure. Voiced by Issac Ryan Brown in the animated series.

* BadassAdorable
* BlackAndNerdy
* OfficialCouple: With Lucy, come ''2''. You even meet their daughter Halley.

!!'''Lucy'''
[[quoteright:192:https://static.tvtropes.org/pmwiki/pub/images/lucy-w350-h150_9092.png]]

The second friend the player sibling makes in the adventure. Voiced by Allie Urrutia in the animated series.

* AmbiguouslyBrown: Err... rather "Ambiguously Asian." Her hairstyle heavily resembles OdangoHair and her personality reeks of AsianAndNerdy. It's never made clear or elaborated on anywhere else however.
* BadassAdorable
* DamselInDistress: In ''Grubbins On Ice''.
* ForScience
* {{Glomp}}: Does this to Everett at the end of ''Grubbins On Ice''.
* OfficialCouple: With Everett, by 2. You even meet their future daughter, Halley.
* WrongGenreSavvy

!!'''Dorian'''

A strange man who helps the heroes. [[spoiler: Dorsilla's brother.]]

* [[spoiler:SiblingRivalry:]] And he's losing.
* StealthMentor

!!'''Dorsilla'''

A wicked witch who leads the candy theft.

* BadassFingersnap: She snaps her fingers to summon the tornado that removes the player character's costume and deposits them away from her.
* TheDragon: [[spoiler: Actually TheStarscream.]]
* ManipulativeBitch
* WomanScorned: Turning on Dorsilla is generally a bad idea.

!!'''Big Bones'''

The leader of Repugia, the monsters' dimension. He wants to devour every candy in the universe.

* AdiposeRex: Ruler of Repugia and morbidly obese.
* BigBad: The main antagonist of ''Costume Quest''.
* GrimReaper
* {{Kevlard}}: When hitting him with a weak attack, he laughs as it bounces off his large gut.
* NotQuiteDead
* StuckInTheDoorway: Can't get out of the portal he's summoned from, due to being so large.

!!'''Araxia'''

Big Bones' right hand Crestwailer, and main villain of ''Grubbins On Ice''.

* TheDragon
* MoreTeethThanTheOsmondFamily

!!'''Orel White DDS'''
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/orelwhite_6382.png]]

The main antagonist of ''Costume Quest 2''. A dentist who wants to eradicate halloween and candy from the timeline to create a dental hygiene utopia.
----
* BracesOfOrthodonticOverkill: As a child. Turns out, they're not that permanent, and he [[spoiler:sheds them prematurely during his redemption scene.]]
* DepravedDentist
* EvilOverlord: He's known as "Overlord White" in the future.
* FreudianExcuse: Why is he so hell-bent on the destruction of Halloween, and candy in general? His mother was an obsessive, extremist dental hygienist and forced, among other things, BracesOfOrthodonticOverkill, no candy at ''all'' and repeatedly brushing his teeth over and over again. (Which, ironically, will actually damage your teeth.)
* FutureMeScaresMe: [[spoiler:Kid Orel is extremely conflicted when confronted by his future self. After beating his grown-up self down, he resolves to be a better person.]]
* MadDoctor
* MyBelovedSmother: Key reason for his descent into villainy AND dentistry.
* NonStandardCharacterDesign: Stands out among the rest of adults.
* ObviouslyEvil
* PsychopathicManchild: Is seen gleefully skipping through his top-secret warehouse, [[spoiler: which actually houses a recreated plywood suburb where [[{{Hypocrite}} he alone can trick-or-treat door to door and collect all the candy he wants]]. He even has a temper tantrum when the machinery glitches and accidentally insults him.]]
* SlasherSmile: Every time he smiles.