Characters: The Grim Adventures of Billy & Mandy

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    The Main Trio 

Grim

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.

  • The Ageless: Exactly What It Says on the Tin.
  • Abusive Parents: Depending on the episode.
  • Affably Evil: Is remarkably polite when he isn't putting his scythe to work or getting bossed around by the title characters.
  • Anti-Hero
  • Anti-Villain: He was forced by his own parents to chop off People's heads and laugh at their deaths. He's still a Nice Guy, though.
  • Badass: While being pushed around by Billy and Mandy, he still knows how to get the job done as the reaper and kick a mean can of ass.
  • Badass Boast: —> Grim: You don't know who you're messing with, man! I am The Grim Reaper''
  • Badly Battered Babysitter: His general function in the show.
  • Badass Longcoat: As expected of the Grim Reaper.
  • Beware the Nice Ones: He's pretty nice when not reaping, though it has been made clear on several occasions that despite his attitude and butt monkey status to Billy and Mandy, he is not one to be trifled with when his patience is at an end. Just ask Jack O' Lantern.
  • Butt Monkey
  • Can't Stand Them, Can't Live Without Them: On several occasions when he is given the opportunity to be free of Billy and Mandy.
  • Crouching Moron, Hidden Badass: He can be legitimately frightening when he wants to be.
  • Dark Is Not Evil: At the very least nowhere as evil as Mandy.
  • Deadpan Snarker
  • Dem Bones: Grim is like this under his robes. More than once, the other two protagonists have been known to take him apart in order to carry him in a backpack or other small container.
  • The Devil Is a Loser: He's portrayed as an unpopular sissy even before he becomes the kids' servant.
    • In his past, it is shown he didn't even want to be the Grim Reaper, it was just something his parents forced him to do. He took up his role in full swing in order to terrify and get revenge on those who bullied him at school.
  • Does Not Like Shoes
  • Don't Fear the Reaper: Downplayed; he's an Affably Evil Punch Clock Villain who can be scary when he's reaping somebody but is otherwise a nice guy.
  • Evil Laugh: Ah Ha, AH HA HA. AAAH HA HA HA HA HA HAAAAA
  • The Grim Reaper: Obviously.
  • Heroic Comedic Sociopath: Death amuses him, like when he laughs during a show when a patient flatlines, something that even Mandy looked sad to see.
  • Heel-Face Turn: After making the deal with Billy & Mandy.
  • Hot-Blooded: Pretty often, actually.
  • Humanity Ensues: In "Night of the Living Grim". He gets better, though.
  • Hypercompetent Sidekick
  • Hypocritical Heartwarming: Quite a few times when it comes to Billy and Mandy. One of the best examples was in "Scythe 2.0":
    Grim: You keep away from those kids! If anyone is going to have their heads, it's going to be me!
  • I Call It "Vera": In "The Taking Tree", we learn that he calls his scythe "Jodie".
  • Kissed Keepsake: After Eris is tricked into kissing Grim, he says he never washed his face before and won't start doing it now.
  • The Kirk: More or less trying to survive being stuck with two insufferable children.
  • Mistaken for Pedophile: Heavily implied in "Duck!"
  • Nice Guy: Probably the nicest among the cast. He's very pleasant and affable up to the point where people cross the line with him.
  • No Respect Guy
  • Not So Above It All: He tends to get swept up in Billy and Mandy's antics pretty regularly.
  • Odd Friendship: He actually manages to bond with Billy quite a bit.
    • He and Mandy share a dark and macabre sense of humor, helping them to get along at times.
  • Only Sane Man Despite being an all-powerful supernatural being hanging around a suburban neighborhood, he is much more grounded and stable than every other character.
  • Parental Substitute: For Billy. Both of his parents are alive, but his dad is an idiot and his mom is a psychopath, so Billy respects and admires Grim much more than either of them.
  • Physical God: He's the Grim Reaper, after all.
  • Punch Clock Villain: As he himself once stated, he's just doing his job. He's also very friendly when not doing so.
  • Reality Warper: With his scythe.
  • Really 700 Years Old: He was a little kid during the Stone Age.
  • Red and Black and Evil All Over: His Black Cloak is red on the inside.
  • Scary Black Man: His voice actor is black.
  • Screams Like a Little Girl: Depends on the episode
  • Sinister Scythe: Which can do just about anything...except whack the weeds in Skarr's garden.
  • Sociopathic Hero
  • Tragic Villain: He didn't become The Grim Reaper by choice, but because his parents wanted him to. Afterwards, he became a Person of Mass Destruction, and started to enjoy his job.
    • Tragic Hero: He also softens after the deal with Billy and Mandy.
  • Tall, Dark and Snarky: He is Exactly What It Says on the Tin.
  • Team Dad/ Team Mom: He plays both, primarily to Billy. He cooks and cleans for him and is quite fussy about him doing his homework, but also provides an actually respectful adult male figure in his life. Billy even says in one episode that Grim is his idol, and Grim in turn occasionally displays outright fatherly affection for him.
  • Too Dumb To Gamble: If he never wagered his own freedom, he wouldn't have to put up with Billy and Mandy.
  • Unexplained Accent: Grim's Jamaican accent. His grandmother also has one, and has a Jamaican look to her to boot.
  • Willfully Weak: Deliberately avoids abusing his powers to prevent causing problems. Unfortunately for him, that's exactly what Billy and Mandy end up doing.
  • Would Hurt a Child: He's been shown planning ways of escaping his deal with Billy and Mandy, typically by killing them in unusual ways.

Billy

A dim-witted boy who frequently causes problems due to his idiocy. Nonetheless, he has the kindest heart of the trio.

  • 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
  • All-Loving Hero: Unless you're a spider or a clown, in which case he'll try to murder you, Billy is surprisingly adept at befriending pretty much everybody, and has succeeded in ending conflicts nonviolently several times.
  • 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.
  • Ambiguously Jewish: His family apparently celebrates Hannukah in addition to Christmas, though the way he says it makes it sound like an excuse to get more presents.
  • Annoying Laugh
  • 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.
  • Bratty Half-Pint: He can sometimes become one.
  • Beware the Silly Ones: Billy is often the dumbest character on the show, but he has been shown to have bouts of psychotic rage that manage to scare even Mandy.
  • Bumbling Sidekick: While he has moments of surprising insight or competence, he generally functions as this to either Grim or Mandy.
  • Butt Monkey: He gets a lot of physical abuse.
  • 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
  • Childhood Friends: He's known Mandy since they were toddlers.
  • 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.
    • One episode has him simply put a live turtle between two pieces of bread and proudly proclaim "Now that's what I call a sandwich!".
  • 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.
    • He singlehandidly defeated all of Asgard, Odin and the rest of the pantheon included, and he did it with a smile on his face the entire time.
    • He also helped Hoss Delgado fight a group of zombies with nothing but a piece of woods.
    • 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).
  • Drop the Hammer: His Weapon of Choice is a war hammer, which he is surprisingly skilled at wielding.
  • Dumbass Has a Point: Very commonly chimes in to point out the flawed logic in Mandy or Grim's thinking, only to be dismissed as an idiot.
  • Everyone Has Standards: Even he thinks Fred Fredburger is annoying.
  • 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.
  • Fluffy Tamer: His specialty is befriending supernatural horrors that help the trio out in a pinch.
  • Friend to All Living Things: Although in the case of spiders, he doesn't love them back.
  • Gag Nose: Has a bulbous pink nose that is often bruised or even knocked off his face.
  • 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 well, 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.
    • He's also occasionally surprisingly eloquent for an idiot.
  • Idiot Hero: Far more traditionally heroic than Mandy and Grim, but also much more idiotic and twice as destructive.
  • 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.
  • Jerk with a Heart of Gold: To a lesser extent than Mandy. He sometimes downright annhilates people without any regrets (an especially bad case for Grim), however doesn't seem to realize that he's doing it. He is otherwise the most open and carefree of the group, and befriends everyone he sees.
  • Kavorka Man: Wins the hearts of both a beautiful mermaid and an ugly sea hag in one episode.
  • Keet
  • Kindhearted Simpleton: Downplayed, while he causes a lot of trouble, it's more out of his stupidity rather than malice. However, he is the second nicest next to Grim.
  • 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) and 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.
    • He's also one to Grim, who seems almost affectionate towards him at times.
  • The McCoy: Stupid and impulsive.
  • Nice Guy: For the most part. Sometimes childish idiocy makes him act like a jerk, but he's generally a very sweet and affectionate guy.
  • Odd Friendship: His two closest friends are an obscenely dark and anarchistic girl and the humanoid personification of death.
  • One-Man Army: He's occasionally shown to be almost disturbingly powerful when angry, to the point where even Mandy is terrified of him.
  • Only Friend: He appears to be the only person Mandy actively hangs out with.
  • Pink Girl, Blue Boy: The blue boy to Mandy's pink girl.
  • The Pollyanna: His life is honestly pretty horrible, but he remains a blissfully oblivious idiot regardless.
  • Red Oni, Blue Oni: The red to Mandy's blue.
  • Sad Clown: One episode has Billy chronicle his daily experience. It's surprisingly depressing. Not that he notices.
  • 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. He more or less becomes the most powerful character on the show when in this state, as he is always curbstomps his opponent.
  • Why Did It Have To Be Spiders?

Mandy

Voiced by: Grey DeLisle

A manipulative little girl who frequently abuses Grim's power to get what she wants. She never smiles and terrifies almost everyone around her, her parents included.

  • The Ace: She's hypercompetent at pretty much everything and has almost the entire universe grovelling at her feet. It makes her plans for world domination all the more terrifying due to how plausible they are.
  • Action Girl: She's the most consistently competent in a fight out of the three of them.
  • All Girls Want Bad Boys: She falls in Love at First Sight with a goth boy who Billy befriends in one episode. Her reaction is surprisingly adorable.
  • Anti-Hero: Either a Nominal Hero or a Villain Protagonist.
  • Arbitrary Skepticism: Despite living in a world where supernatural elements are commonplace, and being friends with the Grim Reaper himself, Mandy adamantly refuses to believe in such things as Santa Claus and the Tooth Fairy.
  • Badass Normal: Despite not having any powers, her intimidation towards others gets the job done.
  • Beware the Quiet Ones
  • Big Damn Heroes: Despite her goal on world domination, she saved the world multiple times.
  • Big Bad: Of The Grim Adventures Of The Kids Next Door.
  • Bigger Bad: She's never the main villain barring the KND crossover, but she is responsible for enslaving Grim, leading to pretty much all of the supernatural occurrences in Endsville. And while she always stops them, it is explicitly because she plans on conquering the world herself, which she is shown to have done in the Bad Future.
  • Big Ol' Eyebrows
  • Blondes Are Evil
  • Childhood Friends: She's known Billy since they were toddlers.
  • The Comically Serious: Even more than Hoss Delgado.
  • Creepy Child: She tricked The Grim Reaper into eternal servitude, using him as her maid and his powers for personal gain, and faces down everything from the Boogeyman to Cthulhu with nothing more than a wry comment. She also never smiles, ever, because doing so would cause the universe to implode. She was also able to take over a large evil brain/alien when it ate her brain.
  • Death Glare: Almost everyone get scared of her just by using her words. This goes even to the point where Grim of all people has nightmares of her.
  • Deadpan Snarker: Definitely.
  • Emotionless Girl: She seems to have only three major emotions: Indifference, disgust, and anger.
  • Enfant Terrible: Young enough and psychopathic enough to qualify.
  • Even Evil Has Standards: She wants to rule the world and turn it into a dystopia, but she is not okay with cheating.
  • Evil Genius
  • Expy: Has a few characteristics similar to Gaz from Invader Zim.
  • Flanderization: From having no emotions, along with a Hair-Trigger Temper, to a totally sadistic psychopath trying to take over the world, who not only can pretty much fix or undo anything by just appearing on the scene, but owns everyone apparently.
  • Flat Earth Atheist: She is rendered immune to the Tooth Fairy's powers by revealing, to his face, that she doesn't believe in him.
  • Fluffy the Terrible: She's a tiny little girl in Mary Jane's who almost always wears pink outfits with flowers on them. She's also the scariest being in the universe.
  • Guile Heroine
  • Hair Decorations: Wears a black headband.
  • Hair of Gold, Heart of Gold: Averted big time.
  • Hates Being Touched
  • Hidden Depths: The prospect of living a life of quiet desperation is the only thing that can shake Mandy to her core.
  • Hijacking Cthulhu: In a certain episode, a brain-eating alien monster with a familiar singing voice has been spending the whole episode being fed by Billy. When Mandy confronts it, it sucks out her brain.... but its aura immediately changes to resemble Mandy. Her only explanation is that she was too "spicy".
    • Likewise she does this to the "Delightful Reaper" in the KND crossover when she realizes it was too powerful for Kids Next Door's weaponry and willingly let it assimilate her. Like it the above example, it takes on her appearance.
  • Horned Hairdo: Making her look fittingly demonic.
  • Hypocritical Heartwarming: She would never let Billy do any of the things that she does.
  • Improbable Weapon User: In the Cartoon Network game "The Fight Before Christmas", she uses a toy hammer, a toy plane, a dollnote , a fistful of marbles and a pan of popcorn as weapons against the evil toys overrunning Santa's workshop.
  • Informed Deformity: In My Fair Mandy, a skilled make-over artist was shocked by her appearance, at first mistaking her for an ugly tree stump.
  • Iron Lady: Her ultimate goal in life is "[....]to do something important!" She eventually is elected president of the United States, and in the distant future, will rule the world.
  • Jerkass: She only had her few moments in the first couple of seasons but more and more after each one of them. Beyond a shadow of a doubt. Her beast transformation in "Sickly Sweet" even makes her sound like a literal ass (the animal). Hell, that episode shows that even trying to do anything nice is nearly impossible for Mandy, to the point where she has physical difficulty just trying to say "Please."
  • Jerk with a Heart of Jerk: While she does do heroic actions like saving Billy from himself or whatever Monster of the Week they're up against, as well as saving the whole planet, Mandy will always have a selfish motive in mind no matter what — but...
  • Jerk with a Heart of Gold: ...she is also shown to care about Grim and Billy, even though she won't admit it and never talks about it.
  • Jerkass Fašade: Mandy may act cold, but she's actually very insecure deep down.
  • Karma Houdini: Rule of Funny usually dictates that she gets off scot-free — but there are a few occasions where she's outwitted.
  • Lack of Empathy
  • Lady of War: Thoroughly subverting Real Women Never Wear Dresses, Mandy, a staunch feminist, wears pink while discussing Faustian bargains over tea.
  • Little Miss Badass: Wears pink, is blonde, snarks almost constantly, and makes the Grim Reaper her personal bitch in the first episode.
  • Little Miss Snarker
  • Madden Into Misanthropy: It's implied that three things helped complete Mandy's metamorphosis into the cynical tyrant we all know and love: The realization that her beloved unicorn toys were being churned out daily by a factory, Mindy's inane, meaningless prattle, and having to deal with Billy every single day of her life.
  • Manipulative Bitch
  • Noble Demon: She's The Dreaded, brooding, anti-social and occasionally evil but she's also loyal and stays close to her friends, always keeps her word and never cheats.
  • The Noseless: But she does have nostrils.
  • Odd Friendship: She willingly hangs out with Billy, despite the two of them being polar opposites.
  • Off Model: She looks decidedly... wrong in Underfist.
  • One-Winged Angel: Her future self.
  • Only Sane Woman: Trades roles with Grim, depending on the episode.
  • Perpetual Frowner: Because if she smiles....
  • Pet the Dog: She will occasionally meditate on the possibility that she actually cares about Grim and Billy...but ultimately dismiss the errant thought.
    • In "Halls of Time", she seems legitimately horrified at the idea of Irwin being erased from existence.
    • Accepting Saliva (in her own way).
  • Pink Girl, Blue Boy: The pink girl to Billy's blue boy.
  • Red Oni, Blue Oni: The blue to Billy's red.
  • Slapstick Knows No Gender: Though rarer than with Billy, she's not immune to physical comedy. Whether that's being burned to a crisp by Cerberus in "Mandy Bites Dog", or being covered in snot twice after Grim sneezes on her in "Night of the Living Grim".
  • Sociopathic Hero
  • The Spock: Intelligent and deadpan.
  • The Stoic
  • Sugar and Ice Personality: She is actually shown to be somewhat caring and even passionate in some episodes.
  • Tiny Tyrannical Girl: In fact, almost everyone in the show is afraid of her.
  • Token Evil Teammate
  • Tomboy with a Girly Streak: For someone so decidedly unfeminine, she has a tendency towards pink and girly things. While there's an underlying hint of irony to it, she seems to legitimately like them.
  • Took a Level in Jerkass: Mandy became more hostile and disrespectful towards her friends in later seasons.
  • Unsympathetic Comedy Protagonist: She has no positive qualities beyond being intelligent and competent, both of which she uses to make the world a bad place.
  • Villain Protagonist: When you make the personification of death look like a nice guy in comparison...
  • When She Smiles...she tears the very fabric of time, space, and reality apart. For the sake of humanity, it's better that she doesn't smile. Although in some earlier episodes, this trope is played straight.
  • Wise Beyond Her Years: She may be a real bitch but she's EASILY the smartest character on the show.
  • You Go Girl: Billy wouldn't allow Mandy in his baseball team because she's a girl. Trying to teach him a lesson, she disguised herself as a boy named "Manfred" by donning a baseball cap.
    • Billy and Irwin made a racing team and wouldn't allow Mandy in because she's a girl so she started her own team with Grim, who was rejected from Billy and Irwin's for being a skeleton. Pud'n won.

    Other Characters 

Irwin

Voiced by: Vanessa Marshall

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

Harold

Billy's father and Gladys' husband.

  • Bumbling Dad
  • Closer to Earth: While he is dumber than Gladys, he is not as prone to fits of nervousness like she is and is quite relaxed around Grim.
  • Crouching Moron, Hidden Badass: A former Navy SEAL.
  • Fat Idiot: He's not a stupid as his son, but he's close.
  • Flanderization: He actually wasn't particularly stupid early on, just lazy and apathetic to the fact that his son was friends with the Grim Reaper. By later episodes, he's almost as dumb as Billy.
  • Happily Married: To Gladys.
  • Hidden Depths: In his youth, he was apparently smart enough to get accepted into Harvard University. Too bad his acceptance letters were stolen by a demonic tree. He was also a Navy SEAL at some point.
  • Mr. Vice Guy: He's overall a decent guy, even if he's disgusting and rather stupid sometimes.
  • Red Oni Blue O Ni: The blue to Gladys' red.
  • Strong Family Resemblance: He's an older, fatter Billy with a pompadour.
  • Too Dumb to Live: Billy got more than just his looks. This applies even before he Took a Level in Dumbass considering he didn't seem to notice that Grim was actually the Grim Reaper!
  • Took a Level in Dumbass: Started out as reasonably intelligent, but eventually became stupid enough to make Billy look like a genius.
  • Ugly Guy, Hot Wife

Gladys

Voiced by: Jennifer Hale

Billy's mother and Harold's wife.

Eris

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.

  • Art Evolution: He's noticeably older looking in Underfist, sporting a beer gut and streaks of grey in his hair. He's also even larger than before and has a chainsaw leg.
  • Anti-Hero: He believes that all monsters are a threat, which causes him to murder any monster he ever sees, even innocent and harmless ones.
  • Badass: Designed as an amalgam of various badass tropes. He handily keeps his own against Grim every time they fight and takes on hoards of giant monsters on his own with little trouble.
  • Badass Decay: Underfist reimagines him as washed up and still hung up on his breakup with Eris, now sporting a beer gut and living with his mom. He gets his ass handed to him countless times throughout the movie.
  • Big Brother Mentor: Acts as a rather half-assed one to Billy, and Irwin as well in a few episodes.
  • Bunny-Ears Lawyer: He's a tad eccentric and not very bright, but he is a damn good spectral exterminator.
  • Characterization Marches On: He's presented as a bit of an incompetent buffoon in his first appearance. In all of his following ones he is shown to be extremely competent at his job.
  • The Comically Serious: His lines are almost always ridiculous, but delivered in a completely serious Badass Baritone.
    "I've been bitten by ghosts, haunted by mome raths and slapped by vampires... I think I've earned a free hotdog."
    "Are you stepping in my cornflakes? I'll tell you something about stepping on someone's cornflakes... it's a weird way to eat cornflakes"
  • Dating Catwoman: His relationship with Eris.
  • Dark and Troubled Past: Parodied. He has an exceedingly long and convoluted one that is also ridiculously lame, involving wetting the bed till he was 35, being raised as a girl for most of his childhood, poking his eye out after running with scissors and getting constantly one upped by a traffic cone.
  • Dumb Muscle: He's far from the brightest bulb.
  • Empowered Badass Normal: He replaced his own hand with an Iron fist that can turn to all sorts of weapons from a gun to a chainsaw.
    • He also replaced his leg with a chainsaw in Underfist.
  • Eyepatch of Power
  • Expy: From Snake Plissken and Ash at the same time!
  • Hunk: According to Eris. He's so obscenely muscular and hairy that he can be easily mistaken for bigfoot when shirtless.
  • The Hunter
  • Narcissist: He's pretty self absorbed, to the point where his debut has him trying to justify a reason for a random street vendor to give him a free hot dog.
  • One-Man Army: Generally has an easy time taking out hoards of supernatural monsters, though he has quite a bit more trouble dealing with Eris.
  • Perma Stubble: Pretty much a given, considering who he's based on.
  • Pre Ass Kicking One Liner: When he isn't belting out complicated and bizarre metaphors that don;t apply to the situation, he's delivering really campy one liners.
  • Swiss Army Appendage: His cyborg hand.
  • The Stoic: Most of the time.
  • Tragic Hero: His gruesome experiences with monsters has caused him to attempt to destroy every monster he sees, even harmless ones. This often gets him to become a Hero Antagonist.
  • Took a Level in Badass: In the past. He used to be a loser like Irwin, until he became the Hoss we know.
  • Took a Level in Dumbass: He was never particularly smart, but Underfist takes it a step further.
  • Top-Heavy Guy: His upper body becomes bigger and bigger while his legs become tinier. By Underfist he's obscenely beefy and supported by two tiny tooth pick legs.
  • The Worf Effect: Very present throughout Underfist.

Boogie

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.

Mindy

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.

Pud'n

Voiced by: Jane Carr

A classmate of Billy and Mandy's, Pud'n is a very sensitive young boy who is constantly picked on by Sperg.

  • Butt Monkey
  • Brown Bag Mask: He wears one while competing in a go-kart race with the other kids. He miraculously wins, despite his go-kart being nothing more than a simple red wagon. Mandy ends up unmasking him, and he starts crying like a baby when he sees everyone cheering for him.
  • In Touch with His Feminine Side: He's weak, completely non-aggressive, loves fluffy pink bunnies, and cries at the drop of a hat.
  • Raised by Wolves: In one episode, Billy asks what Pud'n is doing outside late at night, only for Pud'n to show that he was raised by wolves, and they live outside.

Sperg

Voiced by: Greg Eagles

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

Nergal

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.

Jeff the Spider

Voiced by: Maxwell Atoms

A man-sized spider that Billy hatched from an egg who quickly imprinted on Billy.

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".

Tanya

Voiced by: Phil La Marr

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

Dracula

Voiced by: Phil La Marr

A vampire that was Grim's childhood hero.

Sir Raven

Voiced by: Julian Stone

A raven that occasionally narrates episodes.