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Characters: The Grim Adventures of Billy & Mandy


Voiced by: Greg Eagles

The Grim Reaper who is fated to be Billy and Mandy's "best friend" forever after losing a limbo contest to them.


  • Abusive Parent: To his "son", the giant spider, Jeff. (Semi-justified in that Billy is extremely stupid and has an irrational fear of spiders)
  • Adorkable
  • Ambiguous Disorder: It's fairly obvious that Billy has genuine mental problems in addition to being extremely stupid, as shown by his bouts of psychotic, murderous rage.
  • Annoying Laugh
  • Anti-Hero
  • Arson, Murder, and Jaywalking: Billy's three greatest fears are spiders, clowns, and the mailman, with the greatest fear of them all being a spider/clown/mailman hybrid.
  • Beware the Silly Ones: Billy is often the dumbest one on the show, but he has been shown to have bouts of psychotic rage that scares even Mandy.
  • Butt Monkey
  • Chaotic Stupid: When Billy takes Mandy's raw nerve, he gleefully abuses Grim, implying that a lack of courage was the only thing that stopped him from doing so before (unless the nerve also influenced since it was Mandy's). He also has an "inner frat boy" that advises him to beat the crap out of anything he doesn't understand.
  • Cheerful Child
  • Cloud Cuckoo Lander
  • Cordon Bleugh Chef: In an early episode he dreamt that he made cookie dough out of assorted junk food, then ate it raw because he wasn't allowed to use the oven anymore. He also apparently eats his cereal with chili and makes his waffles with pickles.
  • Crouching Moron, Hidden Badass: He was able to outfight all of Asgard, take on an entire alien ship by himself, and even make grim and mandy run from him. He's a moron, but he's also very competent badass when he wants to be.
    • In "Secret Snake Club", he actually becomes a CIA agent, tracking down a fugitive and exposing Irwin's plans with the macrame club.
      • Future Badass version in the Big Boogey Adventure. Most notably, in the five minutes of screentime he gets, he almost never says or does a single dumb thing. In fact, he somehow managed to time travel back in time without the use of a nearby inoperable Time Gate. And this is Billy we're talking about. It makes one wonder what did Mandy do to make Billy become this way...
  • The Ditz: His IQ is -5, being outperformed in the test by a shovel and two candy bracelets (they got a positive 17).
  • Expy: Of Stimpy.
  • Extreme Omnivore: He enjoys eating boogers, toenail clippings, and (it's heavily implied) cat and dog poo, the last of which he actually uses as steak sauce.
  • Gasshole
  • He-Man Woman Hater: He insists that Mandy and other girls not be allowed on his baseball team... despite them soundly being better at it than he is.
    • Even having Mindy outperform his team didn't change Billy's mind.
  • Hidden Depths: He is shown to dance to real good, defeat multiple enemies in combat-sometimes without even touching them-and is prone to simple-minded wisdom that actually make a whole lot of sense.
  • Improbably Low IQ: -5.
  • Informed Judaism: The Christmas episode states he's Jewish, but it's never brought up again.
  • Jerkass Ball: As with Mandy, Billy has his moments, too.
  • Keet
  • Kindhearted Simpleton: Downplayed, while he causes trouble alot, it's more out of his stupidity rather than malice. However, he is nicer of the three.
  • Lack of Empathy: Especially apparent when interacting with his "son", Jeff.
  • Lethally Stupid: Everything Billy does within the show will inevitably result in mass destruction and chaos, especially when magical artifacts like Grim's scythe are involved.
  • Made of Iron: He has suffered many injuries throughout the show's run (several of which result in his skin being torn open) & absolutely none of them were permanent.
    • A few of his injuries involve having his entire face being blown or torn off!
  • Morality Pet: For Mandy. When she's not bullying him or helping him for her own personal gain, she's treats him as a scolding mother would treat her son.
  • The McCoy: Stupid and impulsive.
  • Nice Mean And In Between: The Nice.
  • The Pollyanna
  • Screams Like a Little Girl
  • Simpleminded Wisdom: He does this more often than he should, making you second guess his stupidity.
  • Strong Family Resemblance: To his dad.
  • Token Good Teammate: Compared to Grim and Mandy at least.
  • Took a Level in Dumbass: By the end of the show, Billy's become an Epic-Level dumbass.
  • Unstoppable Rage: When he's in this mode, even Mandy is scared of him.
  • Why Did It Have To Be Spiders?


Voiced by: Grey DeLisle


Voiced by: Vanessa Marshall

A nerdy boy and a close friend of Billy's. He has a crush on Mandy.


Billy's father and Gladys's husband.


Voiced by: Jennifer Hale

Billy's mother and Harold's wife.


The goddess of chaos. She possesses the powerful Apple of Discord, a golden apple which can transform into any shape to perpetuate chaos. Grim used to have a crush on her during earlier episodes, but later changes his mind, claiming her to be a "psychopath". She is also in love with Hoss Delgado.

Hoss Delgado

Voiced by: Diedrich Bader

A spectral exterminator.


Voiced by: Fred Willard

An old arch-enemy of Grim's since junior high school, and a former school bully, Boogey played pranks on Grim throughout his school career. Boogey is, in fact, the Boogeyman himself, and can shapeshift in order to scare people.

General Skarr

Voiced by: Armin Shimerman

Hector Con Carne's paramilitary commander.


An obnoxious and snobby girl from Billy and Mandy's school that is obsessed with proving her worth to Mandy, who doesn't care for her.


Voiced by: Greg Eagles

The local bully, who constantly bullies Billy, Irwin, Pud'n, and other kids to no end.


Voiced by: David Warner, later Martin Jarvis

A black-skinned supernatural being with green eyes and wears a business suit. With the ability to shapeshift he can create several tentacles from his back that can electrocute his victims or turn them into beings looking like himself. What Nergal desires most is having friends, once stating that it is quite lonely in the center of the world. However, he gets better once he starts a family.

Nergal Junior

Voiced by: Debi Derryberry

The son of Nergal and Billy's aunt Sis. He is also Billy's first cousin.

Fred Fredburger

Voiced by: C.H. Greenblatt

A dimwitted, pale green, bipedal furry otherworldly creature resembling an elephant with stubby horns and the tail of a devil.

Jack O'Lantern

Voiced by: Wayne Knight

The main antagonist in the Halloween special, Billy & Mandy's Jacked Up Halloween.

  • Big Bad: Of the Halloween special.
  • Disproportionate Retribution: The members of his own town saw to it he was executed just because he didn't know when to stop pranking them. Pretty dark, given the silliness of the show in general.
    • Demonstrated when he's sent to the underworld. This is still a bad habit of his and got his pumpkin head squashed. So it was bound to happen sooner or later.
    • His pranks were causing people injury; tricking a guy off a cliff.
  • Evil Laugh
  • Genre Savvy: He actually manages to see through what he thinks is Mandy's initial attempts to prank him. However he doesn't count on Erwin's clumsiness.
  • Hoist by His Own Petard: When Grim came to collect him the first time, he managed to stop him with a feather leading into the deal to give him immortal life. At the end of the special, Grim uses a feather to send Jack to the underworld.
  • Freudian Excuse
  • Jerkass
  • Large Ham: He's voiced by Wayne Knight. Of course he's this.
  • Off with His Head!: Via Grim
  • The Prankster: Of the evil variety.
  • Who Wants to Live Forever?: "Three hundred and sixty-four days a year, I can't even go the the Ding-Dong Grocery Store to buy pudding. And do you know why?"
    • Of course it's not so much living forever then "living forever with a pumpkin for a head".


Voiced by: Phil LaMarr

Irwin's grandmother, more commonly known as "Grandmama."


Voiced by: Phil LaMarr

A vampire that was Grim's childhood hero.

Sir Raven

Voiced by: Julian Stone

A raven that occasionally narrates episodes.

Green Lantern: The Animated SeriesCharacters/Western AnimationGrojband

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