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The Main Trio
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. His mom always complains about his lack of enthusiasm for his job and his dad would never talk to him and always listened to country music.
- Affably Evil: Is remarkably polite when he isn't putting his scythe to work or getting bossed around by the title characters.
- And I Must Scream: Eternally a prisoner to Billy and Mandy. Can't violate his contract with them or else he'd then spend an eternity in the Underworld Prison.
- Anti-Hero: He's this only when a greater evil threatens the world or Billy and Mandy.
- 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: "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: A lot less than Billy, but he has his moments when he's near Mandy or a rival.
- 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: He makes a lot of death jokes and underworld puns.
- 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 Has a Bad Sense of Humor: Even Mandy is sometimes taken aback by the macabre horror Grim finds delightful.
- Evil Laugh: Ah Ha, AH HA HA. AAAH HA HA HA HA HA HAAAAA
- Four-Temperament Ensemble: The Melancholic
- Glowing Eyes of Doom: Several times when he gets absolutely enraged.
- 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: This the reason why Mandy wants to keep him and ditch Billy.
- 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!"
- No Respect Guy: Even in the underworld, he gets no respect for his many duties as Reaper.
- 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. 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.
- 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. After all he is not the cause of the death merely the aftereffects.
- Rage Breaking Point: Normally subservient and kind even when being bossed around, he does have limits though; when he's finally had enough and loses it, even Mandy herself often won't mess with him.
- 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
- Shipper on Deck: He teasingly ships Billy and Mandy occasionally.
- Sinister Scythe: Which can do just about anything...except whack the weeds in Skarr's garden.
- Sociopathic Hero: He dosen't like conversing with humans, much less saving them.
- 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. He also softens after the deal with Billy and Mandy.
- Tall, Dark and Snarky: He is Exactly What It Says on the Tin.
- Too Dumb to Live: 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.
- Villain Protagonist: A surprisingly downplayed example, since he shows his evil side sporadically and often (but not always) after being provoked.
- 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.
Voiced by: Richard Steven Horvitz
A dim-witted boy who frequently causes problems due to his idiocy. Nonetheless, he has the kindest heart of the trio. Apart from when he doesn't.
- Abusive Parent: To his "son", the giant spider, Jeff. (Semi-justified in that Billy is extremely stupid and has an irrational fear of spiders) Billy tries his best to squish Jeff including sending an exterminator to crush him beneath a huge cowboy boot, throwing furniture onto him, and cutting the brake cables in his car.
- Adorkable. He's so dumb and stupid it's adorable.
- 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 Hanukkah in addition to Christmas, though the way he says it makes it sound like an excuse to get more presents.
- Annoying Laugh: And how!
- 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.
- Ax-Crazy: The disorder thing? Well it can get pretty severe for a clown or a spider (for daring to be different) or for everyone if Billy is in a destructive and hyperactive mood (which he pretty much is all the time) and yields a hammer.
- 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.
- Black Bead Eyes: One of the few characters on the show who has this eye style.
- Bratty Half-Pint: He can sometimes become one.
- 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: He rarely has outbursts of rage, but when he does, this goes away really fast.
- Childhood Friends: He's known Mandy since they were toddlers.
- Cloud Cuckoo Lander: He will spout stuff that makes no sense except to him and maybe Irwin
- 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.
- 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.
- Fiery Redhead: Only when he's angry.
- Fluffy Tamer: His specialty is befriending supernatural horrors that help the trio out in a pinch.
- Four-Temperament Ensemble: The Sanguine
- Friend to All Living Things: Although in the case of spiders, he doesn't love them back.
- 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...
- Gag Nose: Has a bulbous pink nose that is often bruised or even knocked off his face.
- Gasshole. Lampshaded by his mom, his first words were in fact gas attacks.
- 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.
- Innocently Insensitive: Whenever he insults Grim, it's mostly when he's acting as Mandy's parrot.
- Iron Buttmonkey: To the point that he could be considered The Chew Toy of the show.
- 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 annihilates 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 but then it turns it was just a story he made up.
- 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!
- Major Injury Underreaction: Most of the amusing injuries he sustains, he makes little to no reaction to any of them, which isn't really much of a surprise since he's probably too stupid to realize he got injured.
- The Mentally Disturbed: He does the unusual combo of being both moronic and completely insane.
- 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.
- Obliviously Evil: Sure he "abuses" his "son" Jeff despite the latter's attempts to flatter him, but that's only because Billy has an irrational fear of bugs.
- 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
- She's Not My Girlfriend: Says this word by word when Grim assumed such about him and Mandy in the second episode.
- 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 which admittedly doesn't say much.
- 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.
- Villain Protagonist: The mildest example of the three, though it must be said that he can be as horrible as Mandy towards Grim and the whole world though in a mindless way. He usually gets a pass due to being mentally stunted and can be harmless when he isn't actively Ax-Crazy.
- Why Did It Have to Be Snakes?: Hates spiders with a passion, which creates some rift between him and his spider-baby Jeff.
Voiced by: Grey DeLisle
A merciless, cynical and manipulative little girl who frequently abuses Grim's power to get what she wants. She almost never smiles and terrifies almost everyone around her, her parents included. Unlike Billy, she's stable, sane and intelligent.
- 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 artist boy who Billy befriends in one episode. Her reaction is surprisingly adorable. Then again she is way badder than him.
- Amoral Attorney: Her Halloween costume in one episode.
- 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: Has two big ones that cover her entire face.
- Blondes Are Evil: She makes even the Goddess of Discord, Eris cringe at her schemes.
- Bright Is Not Good: She may be the inverted version of a Perky Goth. She wears brightly-colored clothes and has a Gothic personality.
- 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.
- Deadpan Snarker: Definitely.
- Death Glare: In which intimidates anyone.
- The Dreaded: 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.
- Emotionally Tongue Tied: As revealed in "Sickly Sweet," Mandy is such a Jerkass that even something as simple as saying "please" is nearly impossible for her.
- 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: She's able to manipulate almost every villain and monster for her own will, and God help you if you dare try to cross her.
- 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.
- Four-Temperament Ensemble: The Choleric
- 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 black Mary Jane's who almost always have blonde hair shaped like devil horns and wears pink outfits with flowers on them. She's also the scariest being in the universe.
- Goth Girls Know Magic: Played With. In contrast to her appearance she has a cynical and dark personality befitting a Goth, and does not have any inherent magic, but sporadically gains temporary supernatural and magical powers in episodes.
- Guile Heroine: She can take down foes both mortal and immortal in seconds.
- Hair Decorations: Wears a black headband.
- Hates Being Touched: Do not touch her unless you wish to be bitten or punched.
- Hidden Depths:
- The prospect of living a life of quiet desperation is the only thing that can shake Mandy to her core.
- She seems to actually care for Grim and Billy, as seen in "Big Boogie Adventure" when it seems that Billy may actually have been killed by the Kraken.
- 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. 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 and beaten.
- Lack of Empathy: Whatever empathy she has is locked away in the cold dark recesses of her soul.
- 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: She manipulated the Grim Reaper, Eris, Hoss, and sometimes even Irwin to do her bidding.
- 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 from the episode, "Mandy the Merciless" where she is a giant worm.
- 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.
- Pink Means Feminine: Inverted. Mandy usually wears a pink dress, but she isn't that feminine.
- Pragmatic Villainy: Oh she'll help save the world alright, but only because she needs it in pristine condition for when she conquers it herself. In the same vein, she'll always help defeat the Monster of the Week, but only because the world is hers and she won't let anyone else take it from her.
- 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: She never smiles fully at all. It's for the best.
- 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: The only hero who's more evil than a demon from the underworld.
- 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.
- Why Did It Have to Be Snakes?: Billy claims that she's afraid of professional figure skaters, though she denies this.
- 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.
Voiced by: Vanessa MarshallA nerdy boy and a close friend of Billy's. He has a crush on Mandy.
- Abhorrent Admirer: Towards Mandy. All of the occasions of her reciprocating his feelings were either due to magical influence or being unconscious.
- Black and Nerdy: Though he's not smart, either.
- Black Best Friend: To Billy.
- Breakout Character: Gets steadily more appearances until becoming the main character of Underfist.
- Butt Monkey: Gets a lot of punishment along with Billy.
- The Chew Toy: He is pretty much the Kenny variant of this show.
- Dark Is Not Evil: He's a mish mash of various monsters, but is almost always a harmless and obnoxious nerd.
- Dogged Nice Guy: To Mandy.
- Four-Temperament Ensemble: The Phlegmatic
- Half-Human Hybrid: 1/2 Mummy, 1/4 Vampire, and 22/7 nerd.
- Jerkass Ball: He can even be the villain of an episode if the situation calls for it.
- Stalker Shrine: In the halloween special it is shown that he has one where hundreds of Mandy's eyes glare at him. It is one of the most disturbing things in the special.
- Stalker with a Crush: To Mandy.
- Straw Loser: He makes Billy seem cool in comparison. Even after we learn about all of his monster heritage, he still comes off as a useless loser.
- Super Power Lottery: Irwin's being a Half-Human Hybrid has given him several powers in Underfist such as:
- Took a Level in Badass: In "Underfist".
- Verbal Tic: ...yo.
- With Friends Like These...: He's a pretty unreliable friend to Billy, to the point where he almost seems to hang out with him exclusively to be around Mandy.
- Yandere: When he got the scythe his first thought was to use it to brainwash Mandy and go on a forced date.
Voiced by: Richard Steven HorvitzBilly's father and Gladys' husband.
- Bumbling Dad: Like his son, he often doesn't care about anything and has a small IQ.
- 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.
- 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
Voiced by: Jennifer HaleBilly's mother and Harold's wife.
- Ambiguous Disorder: She's implied to be the source of Billy's psychopathic outbursts.
- Anger Born of Worry: Her angry side was born from her worry of Grim, and she learned to not fear him, but destroy him.
- Doting Parent
- Fiery Redhead: She can even make Grim run away in terror.
- Happily Married: To Harold.
- Mama Bear: Mostly in the earlier seasons. If she considers you a danger to Billy, she will do everything in her power to make sure you stay as far away from him as possible. It's one of the main reasons why she hates Grim so much, and wants him out of her house.Gladys: (after beating Grim over the head with a mop) STAY AWAY FROM MY BABY!!! He's allergic to the undead!
- Properly Paranoid
- Red Oni, Blue Oni: The red to Harold's blue.
- Stepford Smiler: Type 3. She tries to maintain a sense of normalcy and care for her family, but is always close to going over the edge because of Billy's antics. That smile ends up being frozen and forced much of the time as a result.
- Super OCD
- Twitchy Eye: She has this whenever something goes wrong or the supernatural happens.
- Ugly Guy, Hot Wife
- Women Are Wiser: Subverted. While smarter than her husband, she's also mentally unstable and prone to fits of homicidal rage.
Voiced by: Rachael MacFarlaneThe 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.
- Alpha Bitch: Gave off this vibe in her debut episode.
- Always Chaotic Evil: The only person who's more chaotic than her is Mandy.
- Art Evolution: She looks quite a bit different in her second appearance. She looks different again in her third.
- Artifact of Doom: The Apple of Discord, a golden apple which can transform into any shape to perpetuate chaos (though Billy calls it a "magic banana").
- Bare Your Midriff
- Big Bad: Of just about every episode she plays a major part in.
- Blondes Are Evil: Is a vindictive, blonde woman with a gap in her teeth. She delights in causing all kinds of chaos, and does a multitude of destructive things
- For the Evulz: She's the Goddess of Chaos, which pretty much means it's her job to screw with the lives of mortals for fun.
- Hot Goddess
- Impossible Hourglass Figure: She has a curvaceous and beautiful body.
- Jerkass Gods: Lives solely to cause chaos and destruction.
- Ms. Fanservice: She's a curvy woman in a revealing outfit.
- No Celebrities Were Harmed: Her appearance and personality are based on Madonna.
- Physical God
- Reality Warper: Comes with the territory of being an evil chaos goddess.
- Valley Girl → British Accents: Eris's accent turning from a Valley Girl accent to a British accent may be a reference to Madonna, who started speaking in a British accent later on in her music career.
- We Can Rule Together: Offered it to Mandy in one episode. Mandy considered it but when told she'd be the "second most powerful person in the world", she promptly refused.
- Woman in White: Wear a complete white outfit Greek related.
Voiced by: Diedrich BaderA 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.
- 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"
- The Chew Toy: He gets rejected by Eris by being eaten, twice
- 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!
- Hammerspace: Where he keeps all the random attachments for his hand (his chainsaw, goo cannon, crossbow that fires a chainsaw).
- 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 (it was outright called his "Swiss Army Hand" in his video game profile).
- 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.
Voiced by: Fred WillardAn old arch-enemy of Grim's since middle 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.
- Arson, Murder, and Jaywalking: He blames his inability to scare children on TV, video games, and the tuba.
- Big Bad: Of the first movie (interviews with Maxwell stated that Wrath of Khan was what inspired him to use him since he appeared in only one episode). He was also indirectly responsible for the events in the second one.
- Faux Affably Evil
- Humiliation Conga: What happens to him in the climax of the first film. It is so too much for him that the epilogue states that he got completely traumatized for life.
- Jaded Washout: He tends to boast he used to be way scarier than Grim in their middle school years, but nowadays he is just a second-rate monster that can't even scare one single child (except for Billy and Mandy's friend, Irwin).
- Lack of Empathy
- Lean and Mean
- Pirate: His motif in the first movie.
- The Rival: To Grim.
- The Sociopath
- Small Name, Big Ego: See Jaded Washout.
- Smug Snake
- Villainous Breakdown: After the aforementioned Humiliation Conga.
- Why Did It Have to Be Snakes?: Boogie's worst fear is people not finding him scary.
- Would Hurt a Child
Voiced by: Armin ShimermanHector Con Carne's paramilitary commander.
- Anti-Hero: In "Underfist". (Type V in fact)
- Ascended Extra: The only "Evil Con Carne" character to get elevated to recurring status in "Billy and Mandy."
- Badass Beard: In "Underfist"
- Bald of Evil
- Butt Monkey
- Meaningful Name
- The Neidermeyer: Was like this back when he worked for Hector Con Carne.
- Real Men Wear Pink: Is often seen gardening his front yard happily.
- Scars Are Forever
- Sissy Villain: A megalomaniac who knows his way around an attractive garden.
Voiced by: Rachael MacFarlaneAn 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.
- Alpha Bitch
- Asshole Victim
- Bratty Half-Pint: Falls right into this category
- Disproportionate Retribution: When Mindy first moved in Endsville, Mandy actually tried being nice to her because she looked alone. She quickly regretted it hearing her chatterbox antics and told her to shut up. Mindy didn't take it well, and had became her obnoxious rival ever since.
- Evil Redhead: She has ginger colored hair and is a nasty, downright obnoxious Alpha Bitch.
- Foil: To her rival Mandy. They have similar names and both of them are mean and rude, but otherwise they are complete opposites: Mindy is a Genki Girl in contrast to Mandy's Emotionless Girl; Mindy is shallow, spoiled, and stupid while Mandy is dark, cynical, and intelligent.
- Genki Girl
- Heel-Face Turn: At the end of "Underfist".
- Licked by the Dog: A subversion in one episode in which this literally happens and she responds by acting even worse than usual!
- Popular Is Dumb
- Rich Bitch: She is the evil, rich and spoiled queen bee of the school
- The Rival: For Mandy, at least.
- School Uniforms Are the New Black: Is almost always seen in her school clothes.
- Took a Level in Badass: Twice in a row; in both "Wrath of the Spider Queen" and "Underfist".
Voiced by: Jane CarrA 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 so late at night, only for Pud'n to show that he was raised by wolves, and they live outside.
Voiced by: Greg EaglesThe local bully, who constantly bullies Billy, Irwin, Pud'n, and other kids to no end.
- Berserk Button: Don't talk about Sperg's Mom, even if you're referring to her as a respected member of the community.
- The Bully
- Even Bad Men Love Their Mamas
- Jerk Ass: To most kids, but primarily to Billy, Irwin and Pud'n.
- Kick the Dog
- Real Men Wear Pink: He loved to sing showtunes. In "Tricycle of Terror," he expresses a desire to be on Broadway.
Voiced by: David Warner, later Martin JarvisA black-skinned supernatural being with green eyes who wears a business suit. He has the ability to shapeshift, with which 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.
- Affably Evil: He's generally polite, even around his victims.
- Beneath the Earth: Lives in the Earth's core.
- Character Development: Starts off as an Anti-Villain, but ends up becoming a friendly member of Billy's extended family who usually means no harm. This primarily came after he began a family of his own.
- Crazy Jealous Guy: "Son, it's not about you liking a girl, or a girl liking you. What's important is that she can never get away from you."
- Combat Tentacles: He can sprout the from his back.
- Eldritch Abomination: He's a black creature from the center of the earth with electric tentacles (some of which have mouths), removable organs and the ability to turn people into members of his kind.
- Good Parents: He's this to Junior.
- Happily Married: With Aunt Sis.
- I Just Want to Be Loved/I Just Want to Have Friends: Played for Laughs.
- Interspecies Romance: With Billy's Aunt Sis.
- Large Ham: He's voiced by David Warner, this comes with the territory.
- Shock and Awe: Can electrocute people with his tentacles.
- Shout-Out: To a Mesopotamian deity of the same name.
- Stalker Without A Crush: He wanted Billy and Mandy to be his friends long before he was officially introduced to them.
- Yandere: Like father, like son.
Voiced by: Debi DerryberryThe son of Nergal and Billy's aunt Sis. As a result, he is Billy's first cousin.
- Beneath the Earth: Like his father, he lives at the Earth's very core.
- Combat Tentacles
- Creepy Child
- Eldritch Abomination: Even more so than his father; he can shapeshift, walk through walls, spawn bat-like imps from his body and freeze people in supernatural stasis.
- Glamour Failure: No matter what form he uses, he keeps his glasses, yellow eyes, sharp yellow teeth, and green tongue.
- Half-Human Hybrid
- I Just Want to Be Loved/I Just Want to Have Friends: Unlike his dad, not played for laughs... at first.
- Loners Are Freaks: "Freak" is pretty much his nickname.
- One-Winged Angel: His true form, which is so grotesque and deformed that it's rarely, if ever, seen onscreen.
- Shapeshifter Default Form: The form of the first kid he tried to befriend (and subsequently did away with when he was rejected).
- Cheshire Cat Grin: And how!
- Voluntary Shapeshifting
- Yandere: Initially portrayed as violently attacking anyone who mistreated him, but becomes somewhat more passive in later episodes.
- Everyone Calls Him Barkeep: Her real name is never given. She's named by her relation to Billy's family. She's Billy's aunt and Harold's sister.
- Happily Married: To Nergal.
- Maiden Aunt: Before marrying Nergal. Gladys explicitly calls her a spinster when explaining to a curious Billy as to why she "ain't got nobody". Played for Laughs in that she met her true love during a dance contest, and he left her once the contest was over. Gladys explains this was the "Greatest four and a half minutes of her life"
Jeff the Spider
Voiced by: Maxwell AtomsA man-sized spider that Billy hatched from an egg who quickly imprinted on Billy.
- Abusive Parents: Not Jeff himself, but definitely how Billy is towards him. Somewhat justified as Billy is violently afraid of spiders and incredibly stupid.
- Beware the Nice Ones: As seen in "Spider's Little Daddy".
- Female Monster Surprise/Monster Is a Mommy: In "Jeffy's Web"
- Giant Spider: The size of a man.
- Growing Up Sucks: What he and Fred realize in Underfist.
- Nice Guy
- Those Two Guys: With Fred in "Underfist". Which is strange considering the two have had no interaction before that.
- "Well Done, Son!" Guy: His only real goal in life is to really have Billy love him like a son. Of course, when your dad is violently terrified of you, that isn't going to be easy.
Voiced by: C.H. GreenblattA dimwitted, pale green, bipedal furry otherworldly creature resembling an elephant with stubby horns and the tail of a devil.
- Alliterative Name
- Breakout Character: Maxwell Atoms even referred to him as such.
- Catch Phrase: "Yes!"
- Cloud Cuckoo Lander: Is primarily fond of nachos and spelling his own name "real good".
- The Ditz: Even Billy is smarter than him and that REALLY says something.
- Flanderization: Averted. Though his classic name-spelling gag is repeated in almost all of his appearances, he was nowhere near as overused and ended up becoming hated as say, Cheese.
- Growing Up Sucks: What he and Jeff realize in Underfist.
- From Nobody to Nightmare: He becomes the Lord of Horror in the Bad Future.
- The Pollyanna
- Potty Emergency: "I HAVE! TO MAKE! POO-POO!"
- Those Two Guys: With Jeff the spider in Underfist.
- Trademark Favorite Food: Nachos and frozen yogurt, yes!
- Verbal Tic: "Yes!"
Voiced by: Wayne KnightThe 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 Irwin'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.
- Innocently Insensitive: Implied that, before decapitation, he didn't understand that he was hurting people or that people were growing sick of him, to the point of wanting to kill him. He just kept pulling pranks and making jokes with a happy smile and laughed himself to sleep. He seems to have thought that he was genuinely being funny.
- Freudian Excuse
- 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. Though he wasn't as evil before decapitation.
- Used To Be a Pleasant Guy
- 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 LaMarrIrwin's grandmother, more commonly known as "Grandmama."
- Badass Grandma: You qualify as this if you're able to get Dracula, your husband to shut up and just eat their dinner.
- Cool Old Lady: Unlike many of the adults on the show.
- Curbstomp "Yo Mama" Fight: Delivered one of these to Principal Goodbling.
- Fourth Date Marriage: With Dracula.
- I Was Quite The Looker
- Third-Person Person: Occasionally.
Voiced by: Phil LaMarrA vampire that was Grim's childhood hero.
- Breakout Character: Introduced as part of the old horror icons alongside Frankenstein's bride and the Wolfman. But thanks to Phil hitting the role so enthusiastically, he made more appearances, completely eclipsing the Bride and Wolfman, even having a family connection to Irwin. He was even used for part of Cartoon Network's live action Halloween promos via a puppet.
- Disappeared Dad: To Irwin's dad.
- Expy: Of Blacula, the joke being he bears his name despite not looking at all what most media make of him. For extra Hilarious in Hindsight, in the Blacula movie, Dracula is the one who turns Blacula.
- Grumpy Old Man
- Luke, I Am Your Father: Grandfather, to be precise. Namely, Irwin's.
- No Celebrities Were Harmed: Redd Foxx
- Psychopathic Manchild: Is he ever.
- Screw Politeness Im A Senior
- Screw This, I'm Out of Here!: When his wife beat him to a pulp (not knowing he could turn into a bat), once he was far away from her, he took off, in fear of her attacking him again.
- Third-Person Person
Voiced by: Julian StoneA raven that occasionally narrates episodes.
- Creepy Crows: Well, duh.
- Deadpan Snarker
- Large Ham: "Let's watch a clip. WATCH! A! CLIP!"
- Lemony Narrator
- Giant Space Flea from Nowhere: He just kind of... appeared at one point, then started to appear some more. The fans adore him, though, so it's not a big problem.
- Greek Chorus
- Hidden Depths: If "Tricycle of Terror" is to be believed, he has a soft spot for Billy.
- Punctuated! For! Emphasis!: "IMPORTANT! COMMERCIAL! MESSAGE!!!"
- Quintessential British Gentleman: Looks the part, but lacks the personality.
- The Storyteller
- Suddenly Shouting: His specialty.Sir Raven: Alas, poor Billy, destined to walk the sepulchered streets of suburbia! A doomed husk of a child, do not cry for him! DO NOT CRY!!!
Voiced by Dee Bradley BakerA monkey from an anime show who used to replace Grim.