Characters / The Grim Adventures of Billy & Mandy: The Main Trio

The Grim Adventures of Billy & Mandy Main Character Index
The Main Trio | Humans | Supernatural Creatures

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All Three

• Aw, Look! They Really Do Love Each Other: Once in a blue moon, they do express that they genuinely care for each other's wellbeing. Yes, even Mandy.
• Comic Trio: Mandy (leader), Billy (follower), Grim (complainer).
• Hanging Up on the Grim Reaper: The premise of the show is that Grim came for the soul of a pet hamster, and is accidentally stopped by precocious kids Billy and Mandy. Billy is so dumb and Mandy is so dark that they can't be intimidated by the Reaper, and they win Grim's service after beating him at limbo over the hamster.
• Nice, Mean, and In-Between: Good-natured, happy-go-lucky Billy (nice), cynical, sadistic Mandy (mean), and surly, sane Grim (in-between). Later seasons often have Grim and Billy trade off their respective roles, as Grim tends to be laid-back and reasonable while Billy is oftentimes thoughtless and reckless when the situation calls for it.
• Only One Name: Much like most of the other characters in the show, their surnames are never revealed. Some episodes get close to it, but never outright reveal it. The exception is maybe Grim.
• Out of Focus: In the Grand Finale Underfist, they don't have a particularly big role. Justified as it was meant to be the pilot of a Spin-Off series, but ultimately never became the case as Maxwell Atoms' contract had expired.
• Pals with Jesus: Billy and Mandy are two ordinary children who roped the Grim Reaper into becoming their best friend by beating him at a limbo contest.
• Smart Jerk and Nice Moron: Mandy and Billy, well Billy was a Kindhearted Simpleton before taking a level of being the Insufferable Imbecile.
• Terrible Trio: See Villain Protagonist below.
• Villain Protagonist: Grim is, well, The Grim Reaper, and Mandy is an overly opportunistic being bent on ruling the world. Billy turned into this as the series went on, becoming a selfish, destructive, Ax-Crazy maniac by the series' end.
• Vitriolic Best Buds: They're only best friends under obligation, and they're all prone to abusing each other at the drop of a hat (especially Mandy towards Billy), but they still hang with each other more than anyone else and will usually have the others' backs when necessary. Some episodes hint Billy and Mandy may be more than just this.
• With Friends Like These...: They're all pretty terrible friends to each other. The premise of the show is already Billy and Mandy toying around with Grim, but Grim and Mandy are often verbally abusive towards Billy and can be completely indifferent to some of the plights he goes through, while Grim and Billy have a few moments of being cruel to Mandy when she isn't being cruel herself.

Grim

"What did I do to deserve this?"

Voiced in English by: Greg Eagles (series), Neil Kaplan (Cartoon Network: Punch Time Explosion)^{Other Languages}Sylvain Lemarié (French), Roger Storm (Swedish)

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

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• Abusive Parents: Depending on the Writer; 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.
• Acquainted with Emergency Services: He has this relationship with the nursing staffs at the retirement homes when he comes for the elderly residents, as shown in Season 5 "Home of the Ancients".
  Gloria: Hi, Grim.
  Grim: S'up, Gloria?
  Gloria: Aw. Are you here for Mr. Silverman?
  Grim: No. That's next week.
• Affably Evil: Is remarkably polite when he isn't putting his scythe to work or getting bossed around by the title characters.
• Affectionate Nickname: In the Latin American dub where his name is changed to "Puro Hueso" (pure bone), Billy calls him "Huesitos" (little bones).
• The Ageless: Looks no different from how he looked centuries ago due to being a living skeleton with no skin.
• 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 an anti-hero only when a greater evil threatens the world or Billy and Mandy.
• Anti-Villain: He's not The Grim Reaper by choice, but because he was forced by his parents to be (though this does flip-flop around. One special revealed being a Reaper was being voted by your fellow students in high school). He's also constantly getting his weight thrown around by Billy and Mandy. In fact, if he didn't suffer these two circumstances, he almost wouldn't be villainous at all. That's proven, as he's a fairly nice guy, whenever he's not on his job to take someone's life.
• Badass Boast:
  • "You don't know who you're messing with, man! I am The Grim Reaper!"
  • He had another good one in "Grim vs. Mom".
    Grim: Foolish mortal! I don't think you know who I am. Let me give you a hint! (Magics up his scythe)
  • He has one in the middle of his No-Respect Guy rant in "Attack of the Clowns".
    Grim: I'm the Grim Reaper, for goodness' sake! I used to have a chariot of 400 burning horses! My arrival on the scene would be a raging thunderclap of fear!
• Badass Longcoat: As expected of the Grim Reaper.
• Badly Battered Babysitter: His general function in the show is to suffer from having to look after Billy and Mandy.
• 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.
• Bizarre Alien Biology: While Grim is indeed a walking talking skeleton, some of the ways his body seems to function point to him not being a "normal" skeleton. For one, he has parents and was apparently "born" in some fashion, and is shown to have grown since he was at one point as small as a child. He can also eat - though Rule of Funny determines whether it actually stays inside him or not - has organs, and can suffer from being stung by venomous creatures. There's also the question of whether he can be killed since there are times in the show when he takes threats to his life seriously, but on the other hand he at one point contracts "impending doom syndrome" which is thought to kill whomever catches it, but in Grim's case it actually brings him to life instead. In short, how Grim works is most likely Depending on the Writer at any given time.
• Butt-Monkey: He's the biggest one of the trio. Just about everybody on the show treats him badly. This is mostly played in the first season, where most episodes were focused on making his life as miserable as possible, such as Opposite Day. Later ones tend to downplay it in favor of other characters like Irwin, with him getting along better with Billy and his dad or even Mandy. It still comes in full force in some late seasons episodes, though, such as Be A-Fred, Be Very A-Fred, where he is literally fired by executives.
• 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, he finds being without them even worse than being stuck with them.
• Characterization Marches On: In the pilot, Grim was played up for spooks and light horror value until his defeat, and even in following episodes he expressed a desire to escape his eternal captivity and even tried to get Billy & Mandy killed. Before you've even reached the halfway point of the series, he's become such a tremendous Butt-Monkey that the narrative rarely takes him seriously until it's time to pull out his powers (if they even work), and he's shifted into a much more comical character that doesn't even take his job seriously anymore. Just don't push him too far.
• Conditioned to Accept Horror: In Big Boogey Adventure, he's able to get Horror's Hand, which requires someone to face their worst fears, because his worst fear is having to spend time with Billy and Mandy, which he has to do every day anyway.
• Create Your Own Villain: While it was Jack's own fault for his predicament, Grim giving enteral life at the cost of cutting his head off did indirectly caused Jack to play much worse pranks on Halloween night. Not only that, but Jack would later get a hold of Grim's scythe and causes destruction on Endsville.
• Crouching Moron, Hidden 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. He can be legitimately frightening when he wants to be.
• Dark Is Not Evil: Zig-zagged. He may be a skeleton in a black cloak who collects people's souls when they die and occasionally helps speed up the procedure, but at the very least he's nowhere as evil as Mandy.
• Deadpan Snarker: He makes a lot of death jokes and underworld puns. He's also prone to making cutting remarks about Billy's idiocy.
• Death 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.
• Dem Bones: Grim is a living skeleton 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.
• Depending on the Writer: In some episodes, he's shown to secretly care about Billy and Mandy and often protects them from harm. Other episodes, he legitimately wants them dead to be free of his contract.
• Didn't Think This Through: He said that if he lost the limbo contest against Billy and Mandy, he'd be their best friend forever. He never thought they would actually win.
• Dimensional Cutter: He can open up portals to the underworld or other dimensions by simply ripping thin air with his scythe.
• 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.
• The Dragon: Has to obey Mandy, who is evil and intent on world domination.
• Dub Name Change:
  • In the Latin American version, from Grim Reaper to "Puro Hueso" (Pure Bone), mostly referred as Huesos (Bones) by the cast. He is also nicknamed "Huesitos" (Little Bones) affectionately by Billy.
  • In the Brazilian Portuguese version, his name is "Puro Osso", which means exactly the same thing, though unlike the Latin American version, everyone calls him just that, without nicknames.
  • He is known simply as "Calavera" (Skull) in the European Spanish dub, similarly without any nickname.
  • His name is "Haddi" (Bone) in both Hindi dubs.
  • In the Romanian dubs, he is known as "Negri" which means "Black" in English.
• Embarrassing Middle Name: The episode "Scary Poppins" reveals his is literally "Careful".
  Billy: Be careful, Grim.
  Grim: "Careful" is my middle name. Oh, I never forgave Mom for that one…
• Even Evil Has Standards: Though he is easily described as Affably Evil rather than a redeemed evil person, he is indeed more normal and good-natured than both Mandy and Billy (though he is not as evil as Grim himself), especially because he was manipulated by Mandy into being her supposed slave.
• 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
• Evil Sounds Deep: He speaks in a baritone Jamaican accent.
• Fatal Flaw: His overconfidence in the pilot was what ended up causing him to serve Billy and Mandy.
• Fate Worse than Death: Mentioned by Mandy in the form of a To The Pain speech, given to Grim himself, in "Pandora's Lunch Box":
  Mandy: (angrily grabbing Grim by the neck of his cloak) You're gonna tell it! Or so help me, (amplified with rage) I will pull your stupid cloak through your eyes and use it as reins to ride your bony butt back to the darkest pits of the Underworld from whence you came!
  Grim: Okay, okay! (quietly) You little psychopath.
• Four-Temperament Ensemble: The Melancholic. He's overly critical of Billy, gets angry when the two kids don't listen to him, and is often emotionally insecure.
• From Nobody to Nightmare: The flashback in “Wrath of the Spider Queen” depicts him as this. Back in middle school, he was a wimpy nerd who didn’t have a scary bone in his body and was constantly belittled by just about everyone, especially Boogey. But that changed when Boogey finally pushed him over the edge by indirectly destroying his friendship with Velma during the Reaper Election.
• Ghostly Glide: When his cloak is on, he'll usually move by gliding across the ground. When he's in a hurry, he'll occasionally split the lower half of his cloak into two separate legs and run normally.
• Glowing Eyes of Doom: Several times when he gets absolutely enraged, his eyes glow.
• The Grim Reaper: Obviously, he's the personification of death.
• 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: Subverted. After making the deal with Billy & Mandy, he's more of a follower than his own skeleton, but he was never very actively evil anyway and is still just as friendly and likely to hurt others as before.
• Hidden Heart of Gold: When he decides to save the kids during Nergal's first appearance, he insists it's not because he likes or misses them; he says he's just saving them now so he can eat them later. He often claims he hates his friends but it's made very clear he does care about them and in the end would not let them get hurt. He really is a pretty decent guy.
• Hilariously Abusive Childhood: His childhood was…not bright. But it's Played for Laughs.
• His Name Really Is "Barkeep": It is implied on several occasions that his given name actually is Grim and that his last name is Reaper.
• Hot-Blooded: Pretty often, he's shown to be quite emotional.
• Humanity Ensues: In "Night of the Living Grim", he becomes a mortal human after succumbing to Encroaching Doom Syndrome. The episode ends with him becoming a skeleton again.
• Hypercompetent Sidekick: The reason why Mandy wants to keep him and ditch Billy is that he's more intelligent and reasonable.
• Hypocritical Heartwarming: Quite a few times when it comes to Billy and Mandy, he saves them from someone trying to do something to them that he only finds okay when he's doing it to them. 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!
• Hypocritical Humor: He often bluntly points out how stupid Billy is. And yet, it tended to hurt his feelings when Billy called him stupid for criticizing his favorite show.
• I Am Big Boned: A variation in the comics. Grim isn't thin. He's "delicately boned".
• I Call It "Vera": In "The Taking Tree", we learn that he calls his scythe "Jodie".
• The Kirk: More or less trying to survive being stuck with two insufferable children.
• Kissed Keepsake: After Eris is tricked into kissing Grim, he says he never washed his face before and won't start doing it now.
• Large Ham: His Jamaican accent just emphasizes this trope, along with Greg Eagles' incredibly deep voice, making him one of the hammiest characters on the show.
• Lean and Mean: Downplayed; he isn't REALLY lean^note Actually, especially when he's human, he appears to be a fat one, but he can definitely be mean at times, though he's also more tall than Mandy.
• Leitmotif: The tune that plays when he first arrives? It was a part of his underscore. Though it was played with less frequency as the first season progressed, before ultimately disappearing by the second.
• Lost Him in a Card Game:
  • He unwisely bet his own freedom when he challenged Billy and Mandy in a game of limbo for Billy’s dying hamster, Mr. Snuggles.
  • In “Who Killed Who?” we learn that he lost his pet dog Lucky to Mrs. Doolan in a poker game.
• Mistaken for Pedophile: Heavily implied in "Duck!", where he gets arrested for removing his cloak in front of children while shouting "Look at my body!" in an attempt to explain to the children that he is incapable of passing gas.
• Mistreatment-Induced Betrayal: He's always scheming to do this on Billy and Mandy so he can escape his enslaved position under them. He succeeded in "Halls of Time" by allowing their sand clocks to stay upside down, but then he forgot to flip his own back up.
• Multiple-Choice Past: His many flashbacks to his past seem pretty unreliable. Possibly parodied at one point as well—two of his proposed backstories directly contradict each other in such a way that would be impossible to Hand Wave, Retcon or even ignore outright^note in one, he wanted to be a singer but his dad wanted him to be the Grim Reaper, while in the other his dad wanted him to sing while he wanted to become the Grim Reaper.
• Mundane Utility: In the online game "Zap to It!", the kids use magic from Grim's spellbook to clean up Billy's house after it becomes a mess.
• Never My Fault: A subtle case, but still there. He resents Billy and Mandy for forcing him to be their friend, even though he wagered his freedom in their bet without any kind of prompting out of overconfidence.
• Nice Guy: When he's off the clock Grim is a pretty decent fellow. Heck, even while on the job he's still a pretty laid back guy.
• No-Respect Guy: Even in the underworld, he gets no respect for his many duties as Reaper. And of course he's a slave to two children.
  Grim: (talking about being stored in Mandy's backpack) Okay, we need to talk about this backpack thing. It's very demeaning. I'm the Grim Reaper, for goodness' sake! I used to have a chariot of 400 burning horses! My arrival on the scene would be a raging thunderclap of fear! Now it's "Hey, have you seen Grim?" "Yeah, I think he's wedged between a history textbook and a tuna fish sandwich!" And I'm pretty sure the guys are in the Underworld accounting been laughing at me behind my back. Those guys are turbo nerds! I bet none of 'em even had a date since the 1800's. Hear that, you dateless turbo nerds!?! I'm on to you!
• No-Sell: Pepper spray doesn't affect him because he doesn't have any eyes.
• 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 not the most mentally sound, 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.
• Phrase Catcher: "Bonehead."
• Physical God: He's the Grim Reaper, after all, so of course he would possess immortality and great powers.
• 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 rarely reaps people's souls before it is their time anyway.
• 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.
  • The ultimate example of this is his revenge against Boogey in "Wrath of the Spider Queen". After Boogey indirectly ruins his only friendship, he is so overcome by rage that his revenge terrifies everyone at his school, which ends up winning him the Reaper Election.
    Grim: BOOGEY! This is all your fault!
• Random Effect Spell: Blasts from Grim's scythe can have all sorts of weird effects. In "Goodbling and the Hip-Hop-Opotamus", a stray scythe blast hits Principal Goodvibes and turns him into a gold-toothed, bling-wearing, Totally Radical rapper.
• Reality Warper: With his scythe, he can cause all sorts of things to happen.
• 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.
• Screams Like a Little Girl: Depends on the episode, but he'll quite often scream in a high-pitched and feminine voice when he's scared.
• Severed Head Sports: Has been subjected to this by Mandy a time or two.
• Shipper on Deck: He teasingly ships Billy and Mandy occasionally. In "The Bubble with Billy", he even tries to get Mandy to flirt with Billy to get him to cough up the supernatural gum he swallowed.
• Sinister Scythe: His scythe can do just about anything...except whack the weeds in Skarr's garden.
• Sociopathic Hero: He doesn't like conversing with humans, much less saving them.
• Support Party Member: In the online game The Fright Before Christmas, Grim's role is to use various vacuum cleaning devices to suck up the parts of destroyed evil toys, which can be traded in for stronger weapons between levels.
• Tragic Villain: Played for Laughs. He didn't become The Grim Reaper by choice, but because his parents wanted him to... sometimes. Afterwards, he became a Person of Mass Destruction. He also softens after the deal with Billy and Mandy.
• Tall, Dark, and Snarky: He is really tall, wears a black cloak, and isn't above making snide remarks toward Billy and Mandy.
• Too Dumb to Live: If he never wagered his own freedom, he wouldn't have to put up with Billy and Mandy. The only thing he would've lost would've been an opportunity to collect a hamster's soul.
• Unexplained Accent: Grim's Jamaican accent. His grandmother also has one and has a Jamaican look to her to boot.
  • As mentioned under Vocal Evolution, Greg Eagles attempted a Swedish accent as a reference to The Seventh Seal. What it ended up sounding like was some odd combination of Swedish and something vaguely Jamaican. However, everyone thought that was actually pretty funny, and rolled with Grim having an unexplained accent.
• Unwitting Instigator of Doom:
  • He was indirectly responsible for Trick-or-Treating as he gave Jack eternal life at the price of his head being cut off. This would later bite back as Billy indirectly gave the scythe to Jack to cause mayhem on Endsville and almost cost Grim his own head off.
  • It was also him losing to Billy and Mandy in the first episode that Jack was able to get his hands onto the scythe as Grim let Billy take it for Halloween.
• Villain Protagonist: A surprisingly downplayed example, since he shows his evil side sporadically and often (but not always) after being provoked.
• Villains Out Shopping: Whenever he isn't ordered to kill someone, he lives a perfectly normal life.
• Vocal Evolution: In the pilot, his accent is less Jamaican and more Swedish with a hint of Transylvanian (likely a reference to The Seventh Seal). It becomes consistently Jamaican in the series proper.
• "Well Done, Son" Guy: While his backstory is a bit fluid, "Dad Day Afternoon" presents him as this, desperate to earn the approval of a father who loved country rock music more than him.
• Why Did It Have to Be Snakes?: Horror's Hand is useless against him because he already experiences his worst fear every single day: being with Billy and Mandy.
• 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

"You don't always have to solve your problems by fighting. They can be solved by talking things out. Or by buying expensive gifts."

Voiced in English by: Richard Steven Horvitz (series), Quinton Flynn (Cartoon Network: Punch Time Explosion)^{Other Languages}Michel Mella (French), Anders Öjebo (Swedish)

A dim-witted boy who frequently causes problems due to his idiocy. Nonetheless, he's usually the most innocent and happy-go-lucky of the trio.

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• Absurd Phobia: In "Billy and Mandy's Big Boogie Adventure", Billy is shown to be not only afraid of spiders and clowns, but the mailman as well.
• Abusive Parents: 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.
  Jeff: (as Billy is jabbing him in the eyes with a broomstick) Why won't you love me, Dad?! I'll be anything you want me to be!
  Billy: I WANT YOU TO BE DEAD!
• Acquainted with Emergency Services: In Season 2 "Educating Grim", when Billy tries to race Grim and Mandy to school, he immediately runs into the school's front sign. Cue Nurse Penbroke walking outside holding first-aid kits looking annoyed. After Billy and Mandy leave school, Billy is already covered in bandages and walking with a crutch. When Nurse Penbroke happily waits outside for Billy, he tells her he's done for today and then she releases an exhausted sigh.
  Nurse Penbroke: Oh, Billy.
  Billy: (cheerfully) Hi, Nurse Penbroke. I can't feel my legs.
• Action Survivor: He’s an adolescent boy with no real powers, but often escapes problems with his life. Usually. This is much more prominent earlier on in the show than later.
• All-Loving Hero: Unless you're a spider or a clown or a mailman, 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.
• Ambiguously Bi: He has feelings for girls, but he also doesn't seem to mind the idea of having Grim be more than his "friend".
• 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.
• 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.
• Asskicking Leads to Leadership: In A Kick in the Asgard, he was such a good fighter that even the likes of Thor and Odin feared him, and is revealed to have become the ruler of Asgard in The Stinger of the episode.
• 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 wields a hammer.
• Bad People Abuse Animals: It’s much more prominent following Billy’s Flanderization. Everyone notes he’s a horrible caretaker for animals, as Jeff, Porkchop, Jed, and even Milkshakes can prove.
• Beware the Silly Ones: Billy is often the dumbest character on the show and is the silly-billy, but he has been shown to have bouts of psychotic rage that manage to scare even Mandy. Just ask Grim when a shapeshifter makes Billy jealous. And by jealous, we mean so overcome with envious rage that he goes absolutely ape and pummels Grim within an inch of his immortal life. Twice.
• Big Eater: He loves stuffing his face with chocolate, tacos, sandwiches, burgers, pizza, cookies, and more. He apparently inherited this trait from his dad. He probably avoids getting fat like his dad by burning it off with his hyperactive running.
• Bizarre Taste in Food: Hot buttered sweat socks are a favorite.
• Black Bead Eyes: One of the few characters on the show who has eyes represented as black beads.
• Body Horror: He did this in more than one episode.
• Bratty Half-Pint: He can sometimes become an obnoxious pest.
• Break the Cutie: Depending on the day, he’ll fall into this. Best exemplified in My Peeps and Attack of the Clowns.
• Bumbling Sidekick: While he has moments of surprising insight or competence, he generally functions as a dim-witted lackey to either Grim or Mandy.
• But Not Too Foreign: Implied. His paternal grandfather spoke in a vague Irish/Scottish accent. He also seems to have some traces of Japanese ancestry as shown in Billy Gets An A.
• Butt-Monkey: He gets a lot of physical abuse.
• Chaotic Stupid: Billy has been called as the true lord of chaos and destruction as he has no logical thought process, no restraints, and no stability whatsoever. More than any other character he can alternate between almost every single role (that his idiocy and insanity allow him) depending on his whims because he has no internal consistency. He can be a Heroic Wannabe, a bully wannabe, a peace bringer, a warmonger, an Ax-Crazy maniac, a literal pet, a gum machine, a conniving lawyer, and a yogurt creator all in a day's work. That is why he is the protagonist most fitting to the show's setting. He is just as random as the surreal world that he is inhabiting.
• Characterization Marches On: At the beginning of the series, Billy's a bit dopey, but manages to hold his own in some dangerous situations and comes off more as just a well-meaning kid lacking common sense and looking for fun things to do. By the end of the series, he colossally Took a Level in Dumbass to the point of being so stupid that the laws of reality itself occasionally give up when he's around, and Depending on the Writer can even out-Jerkass Mandy.
• Cheerful Child: He rarely has outbursts of rage, but when he does, his happy attitude goes away really fast.
• Childhood Friends: He's known Mandy since they were toddlers.
• Cloudcuckoolander: He will spout stuff that makes no sense except to him and maybe Irwin.
• Comically Missingthe Point: Billy was once asked a question by Milkshakes about a train leaving Chicago, but he kept changing the subject about things unrelated to the question, like the kind of train, and the train being full of clowns, driving Milkshakes crazy.
• Cordon Bleugh Chef: In an early episode he dreamed 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-a what I call a sandwich!".
• Crouching Moron, Hidden Badass: Billy may be an idiot, but he can come up with a surprisingly effective plan once in a while.
  • 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 was able to take on an entire alien fleet by himself, and even Grim and Mandy run from him in fear when he's angry. He's a moron, but he's also a 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 singlehandedly 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 came up with a scheme to pass the President's fitness test by having Junior turn into a shapeshifting pair of pants he can wear. Even Mandy acknowledges that it was a good idea.
  • He also tried to help Hoss Delgado fight a group of zombies with nothing but a stick. Keyword, tried, but he survived unscathed.
  • His scheme to steal Mandy's raw nerve was remarkably clever for him: he got Grim's cooperation by pointing out that a cowardly Mandy would be unable to bully him and got the nerve to allow him to swallow it by bribing it with an egg roll that happened to be a combo of its two favorite flavors.
  • When he gets sent to military school at the end of Guess What's Coming to Dinner?, as some pointed out from the design of his helmet, before he gets executed by firing squad for attempted desertion, he reaches the rank of corporal.
  • In "Keeper of the Reaper," he successfully builds a court case against Mandy when they have a custody battle over who gets to keep Grim and gets half the jurors to side with him. Granted, coming across as more likable than Mandy isn't very hard.
• Cuddle Bug: At times, he will want to give out a hug.
• Depending on the Writer: Whether he's an honest-to-goodness Nice Guy who is simply so stupid that he's often Innocently Insensitive or a bratty Jerk with a Heart of Gold varies from episode to episode.
• The Ditz: His IQ is -5, being outperformed in the test by a shovel and two candy bracelets (they got a positive 17).
• 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.
• Dumb Is Good: Played with. While his idiocy gives him a childish innocence that allows him to befriend even the most horrible monsters and act unambiguously heroic much more frequently than the other two, his complete lack of self-control and extremely destructive tendencies led him to be arguably the most dangerous of the three.
• Dysfunctional Family: He doesn’t have a grand home life. His father is just as much of a moron and will regularly sell him out and leave him for all kinds of trouble while his mother is insane and goes frantic for the littlest of reasons. And if Billy Idiot is anything to go by, Harold himself had a terrible childhood.
• Early Installment Character-Design Difference: In the original short, Billy and Mandy in: Trepanation of the Skull and You, Billy is taller and has a more proportional design, with his cap being bigger and his nose being smaller.
• Everyone Has Standards: Even he thinks Fred Fredburger is annoying, at least in his first appearance. Everything after that features Billy getting amazed by his antics.
• Eviler than Thou: Or, at least, Meaner Than Thou. Whereas Mandy is still pretty nasty and unpleasant to everyone around her, she is still scared of this boy whatsoever.
• 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.
• Flanderization: Went from being a Kindhearted Simpleton from seasons 1 to 4 and now into an Insufferable Imbecile who is a selfish, Ax-Crazy maniac in seasons 5 to 6.
• Fiery Redhead: He has red hair and can get pretty frightening when he's angry.
• Fluffy Tamer: His specialty is befriending supernatural horrors that help the trio out in a pinch.
• Forceful Kiss: Gives Mandy one of these in Ecto Cooler. Noticeably, she doesn’t try to beat him for it, suggesting there may be more about the two than what’s let on.
• Four-Temperament Ensemble: The Sanguine. He's often overly optimistic, good-natured, and will frequently help people that he knows are having problems.
• Freudian Excuse: Underfist reveals that his fear of spiders was due to Bun-Bun repeatedly dangling spiders in his crib.
  • Also, considering how his father is just as much of an idiot as he is and his mother is often mentally unstable, it's safe to declare that Billy most certainly isn't the way he is without reason.
• The Friend Nobody Likes: Both Grim and Mandy are dismissive of him because of his stupidity, and Irwin is an unreliable friend who almost seems to hang out with him just because he likes Mandy. Since Billy usually likes everyone, while Grim and Mandy tend to dislike most people (including their friends), Billy is on the receiving end of this trope the most.
• Friend to All Living Things: Although in the case of spiders, he doesn't love them back.
• Future Badass: In 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... Not a dumb thing apart from his last words.
  Billy: I should have known it was you all along.
• The Gadfly: Oh, yes. Best exemplified in Skarr’s debut episode in the show, where he goads him into returning to the life of crime. It works until Mandy steps in.
• Gag Nose: Has a bulbous pink nose that is often bruised or even knocked off his face. His dad and paternal grandfather also have this. One episode even gave it focus.
• Gasshole: Lampshaded by his mom, his first words were in fact gas attacks.
• Gleeful and Grumpy Pairing: The continuously happy, cheerful, and naïve Gleeful to Mandy's Grumpy.
• 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, leading to Mandy and Grim discussing whether they should hang a lampshade or not. They decide Billy is not worth that trouble.
• Heroic Bastard: In the episode "Billy and Mandy Begins", Billy mentions that he was born shortly before his parents got married. However, at times, he falls into the opposite trope.
• Heterosexual Life-Partners: He is shown to be close friends with Irwin.
• Hidden Depths:
  • He's occasionally surprisingly persuasive for an idiot.
  • Despite his immense stupidity, he's got an excellent vocabulary.
  • In "The Bubble with Billy", he claims that he's complex and multi-layered and somehow managed to have his own autobiography published.
• Hypocrite: In "The Bad News Ghouls", he repeatedly refuses to let Mandy join his baseball team against Mindy, stating that girls can't play baseball, even though Mindy is also a girl.
• Idiot Hero: Far more traditionally heroic than Mandy and Grim, but also much more idiotic and twice as destructive.
• Idiot Houdini: If he causes trouble, he’ll rarely get punished for it.
• I Have No Son!: Ignores Jeff’s existence and generally treats him with full hatred. It turns out the reason behind this came from a dangling spider that Bun-Bun put in his crib when Billy was a baby.
• Improbably Low I.Q.: -5. Again, a shovel and two candy bracelets are smarter than he is.
• 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. On his own, he usually speaks highly of Grim, but also acts like a spoiled and bratty kid.
• Insufferable Imbecile: Starts off as a Kindhearted Simpleton, but becomes more selfish and Ax-Crazy as the series goes on, due to combining insanity with stupidity, and in some of his worst Jerkass Ball moments, he can even rival Mandy.
• Iron Butt-Monkey: Suffers a lot of horrific injuries he somehow recovers from to the point that he could be considered The Chew Toy of the show.
• Jerkass Ball: As with Mandy, Billy has his moments of being insensitive and rude, too.
• Jerkass Has a Point: In "Wrath of the Spider Queen", Billy delivers a massive Kick the Dog soul-crushing rant to Jeff where he tries to convey just how much he hates the spider. It was incredibly excessive compared to what triggered it but Billy did raise the point that somehow Jeff still hadn't figured out the depths of just how much Billy hates spiders.
• Jerk with a Heart of Gold: He's somewhat insensitive and unempathetic but his heart is definitely in the right place.
• Keet: He's always excited.
• Kick the Dog: Played VERY MUCH for laughs regarding his interactions with Skarr in the latter's debut in Skarred for Life, as the latter genuinely wants to try and live a normal life, only for Billy to shame him for doing so to the point where he starts crying and then successfully tempt him into returning to his old ways by convincing him to steal Grim's scythe, and if it isn't clear before, this is all done on purpose by him.
• Kindhearted Simpleton: Downplayed, while he causes a lot of trouble, it's more often out of his stupidity rather than malice. He generally comes off as well-intentioned.
• Lack of Empathy: Especially apparent when interacting with his "son", Jeff, not noticing or caring that Jeff loves him and only wants his love to be reciprocated. Somewhat justified, as Jeff is a giant spider, and Billy is terrified of spiders, but Billy's fear tends to manifest more as physical aggression and loathing than cowering away, making Billy less sympathetic in light of Jeff's unconditional love for his "father".
• Large Ham: Practically a given since he’s voiced by Richard Horvitz. So much, he’d be a staple of the man’s career.
• Lesser of Two Evils: If Grim had a choice, he would rather not be stuck with either of the children, but he seems to slightly prefer Billy, who is nicer to him than Mandy, even if he's a complete idiot who causes mayhem and destruction everywhere he goes.
• Lethal Chef: He's a horrible cook who can make sandwiches thick enough to fracture Grim's skull and teeth and makes chili that can erase your nose and mouth.
• 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. You’d think Mandy and Grim would’ve caught on in later episodes and keep him close to them.
• Like Parent, Like Child: He's both stupid (like his father) and mentally unstable (like his mother).
• 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.
• Meaningful Name: His name means "desire".
• 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 treats him as a scolding mother would treat her son.
  • He's also one to Grim, who seems almost affectionate towards him at times.
  • He's one to Mrs. Claus in the Christmas Episode, after apparently being the only person in centuries to offer her any help with her multiple duties at the North Pole (without messing up). In fact, Billy's the one who stops her from taking over the world by appealing to her humanity, and by turning Santa back to normal and getting him to apologize for dumping all the work on her.
• Motor Mouth: Of the Turbocharged V-12 variety. RSH really shows off his speed-talking skills when Billy really gets going.
• The McCoy: Stupid and impulsive.
• Naked People Are Funny: Billy is a fairly common victim of this trope. The episode "That's My Mummy" is an episode that does this thrice.
• Never My Fault: In "Billy and Mandy's Jacked-Up Halloween", he indirectly causes all the conflict because he borrowed Grim's scythe, but blatantly shirks responsibility after Jack O'Lantern is defeated and Grim gets his scythe back. He is just too stupid to understand that what he says makes him guilty as well.
  Billy: You know, Grim, none of this would have happened if you didn't loan me the scythe in the first place.
• Noodle Incident: What caused his fear of clowns and the mailman? We discover why he’s so afraid of spiders in the Grand Finale, but never the other two.
• Not-So-Harmless Villain: 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 (though it's also possible that the nerve also influenced his overall disposition 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.
• Obfuscating Stupidity: Some episodes hint that Billy’s much smarter than he lets on.
• Obliviously Evil: Sure he "abuses" his "son" Jeff despite the latter's attempts to flatter him, but that's only because Billy has irrational and psychotic arachnophobia. Underfist reveals that this was the result of the true antagonist dangling spiders in front of Billy when he was a baby For the Evulz.
• Odd Friendship: He's a complete moron whose two closest friends are an obscenely dark and nihilistic girl and the humanoid personification of death.
• Offing the Offspring: He repeatedly tries to murder a giant spider named Jeff who considers Billy his father.
  Jeff: (as Billy is jabbing him in the eyes with a stick) Why won't you love me, Dad? I can be anything you want me to be!
  Billy: I want you to be dead!
• 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.
• Only Known by Their Nickname: His actual name is William, but everyone just calls him Billy.
• O.O.C. Is Serious Business: If he ever drops his happy-go-lucky attitude and endearing dimwittedness, there is only one thing you can do: RUN.
• Pink Girl, Blue Boy: The blue boy to Mandy's pink girl. He wears blue jeans and a shirt with a blue stripe on it, while Mandy wears a pink dress.
• Platonic Life-Partners: With Mandy. They have been best friends, if you can call them friends, since they were infants.
• The Pollyanna: The episode "The Crass Unicorn" has Billy chronicle his daily experience. It's surprisingly depressing. Not that he notices. His life is honestly pretty horrible, but he remains a blissfully oblivious idiot regardless. Somewhat deconstructed in that in the same episode it is shown that Billy is fully aware of how horrible his life is and it bothers him greatly to the point of acting out in an insane fashion or trying to force others to be happy just so they cannot ruin his happiness anymore.
• Rapid-Fire "Yes!": He would often respond with "yeahyeahyeahyeah..." when he's excited.
• Red-Headed Hero: He has a shock of red hair underneath his baseball cap.
• Red Oni, Blue Oni: He's the red oni to Mandy's blue oni. He is impulsive and emotional while Mandy's responsible and stoic. Also an inverted case of Savvy Guy, Energetic Girl.
• Scotireland: It’s only hinted in Billy Idiot, but his grandfather spoke with a vaguely Irish/Scottish accent.
• Screams Like a Little Girl: His screams sound girly.
• She's Not My Girlfriend: Says this word by word when Grim assumed such about him and Mandy in the second episode.
• Simple-Minded Wisdom: He makes intelligent observations this more often than he should, making you second guess his stupidity.
• Simpleton Voice: Not only is Billy extremely stupid, but his voice sounds so too.
• Smarter Than You Look: Make no mistake, Billy is genuinely as stupid as he comes across but he's typically more tuned in to things than he appears.
• Smart Jerk and Nice Moron: The Nice Moron to Mandy’s Smart Jerk. He’s a dim-witted but ultimately nice kid who only seems to have hard feelings towards the bully Sperg and his “son” Jeff (who is a spider, which he is terrified of).
• Straw Loser: Both Grim and Mandy often comment about how dumb Billy is, and how he makes them more intelligent in comparison.
• Strong Family Resemblance: He looks a lot like a miniature version of his father and grandfather.
• Support Party Member: In the online game The Fright Before Christmas, Billy's role is to use items that stop or slow down the hordes of evil toys, making them easier for Mandy to slaughter. He can throw popsicles that freeze toys for a few seconds, flaming chestnuts that incinerate ground-bound toys, or magnets that force toys to stick to each other and make them easier to hit.
• Tear Off Your Face: Regularly a victim of this. In fact, he’s the Image Source.
• They Killed Kenny Again: Out of the main trio, he’s usually the one who gets killed and by next episode, he comes back like nothing happened.
• Token Good Teammate: The only truly nice member of the main trio. It’s much more prominent earlier on than later.
• Too Dumb to Live: At his stupidest, he has absolutely no sense of self-preservation. One standout example was when he got turned into chocolate and kept eating himself.
• Took a Level in Dumbass: By the end of the show, Billy's become an Epic-Level dumbass. Must be from all those blows to the head from Mandy.
• Took a Level in Jerkass: In addition to becoming incredibly stupid, he’s become a lot more aggressive in later episodes.
• Too Spicy for Yog-Sothoth: The one and only time Eris attempts to use him as an agent of spreading chaos ends with her having a nervous breakdown. To put it simply: Billy is too Chaotic Stupid for the Goddess of Chaos to handle.
• Uncanny Family Resemblance: His father, paternal aunt, grandfather, and grandmother all have a Gag Nose like him (though in Aunt Sis's case it's not pink). In an episode where he gets stuck in prehistoric times and falls in love with a cavegirl, it's shown in the present that everyone has his nose as a result of being his descendant.
• Unexplained Accent: In the Traditional Chinese dub, he has a Taiwanese accent but most other main characters (including and especially Grim) speak Putonghua without any strong accents.
• Unintentionally Karmic: His unintentional torment of Grim may not be completely deserved, but when it comes to his new next-door neighbor, retired villainous general Skarr, the destruction and meltdowns he brings are indeed karmic.
• 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 always curbstomps his opponent.
• Unwitting Pawn: At times, he helps the Monster of the Week unknowingly despite it being apparent that they’re not good people.
• 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 most often 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. He's also the only one of the three who ever has heroic motivations, though he tends to do more harm than good when acting on them.
• Vocal Evolution: His voice became much more nasal later on.
• Who Even Needs a Brain?: The meteor monster in "Little Rock of Horrors" finds that it can't eat his brain since he doesn't seem to have one.
• Why Did It Have to Be Snakes?:
  • Hates bugs and spiders with a passion, which creates some rift between him and Jeff, a spider who sees Billy as his father due to hatching his egg.
  • Billy & Mandy's Big Boogie Adventures combines his three greatest fears (spiders, clowns, and the mailman) into one horrifying monstrosity.
• With Friends Like These...: Billy's not that great of a friend to Irwin; he once stopped Sperg from giving Irwin a wedgie... So that Billy could do it for him and become a bully which he decided would make him cool.
• Would Hit a Girl: If he’s mad, no one is immune to his rage, as Mandy can attest.

Mandy

"I don't need some pompous polyp to make me dark, foreboding, and charmingly cynical!"

Voiced in English by: Grey DeLisle^{Other Languages}Dorothée Pousséo (French), Lizette Pålsson (Swedish)

Billy's best friend and his polar opposite; 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.

---

• Absurd Phobia: According to Billy and Grim, she's afraid of figure skaters, of all things. Mandy denies this, but is visibly flustered by the topic and mentions that she doesn't trust the way they spin.
• Abusive Offspring: She's just as rude and demanding to her parents as she is to everyone else; they readily bow down to her, do whatever she wants without question, and openly admit in "Keeper of the Reaper" that they're terrified of her. In a twist on this though, she's genuinely shocked at this revelation, strongly implying that she never intended to frighten them like that.
• The Ace: She's hypercompetent at pretty much everything and has almost the entire universe groveling 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.
• Actor Allusion: According to Grey DeLisle, her superhero persona is in fact a parody of Wonder Woman, who's also played by De Lisle, mostly in the present days.
• All Girls Want Bad Boys:
  • She falls in Love at First Sight with a goth artist boy who Billy befriends in "Crushed". Her reaction is surprisingly adorable. The revelation that he's a poser makes her immediately lose interest in him.
  • Her discovery that Irwin was born evil in "Heartburn" causes her to respect him for having started life with a heart as cruel and twisted as hers. This revelation prompts a twisting of her own heart into becoming as loving and caring as he has made himself, to the point that she actually kisses him... which Irwin immediately ruins by burping into her mouth at that very moment. Her disgust at this causes her to revert to her sadistic personality, but he reveals that he did it intentionally, as her evilness is one of the traits he loves about her.
• Ambiguously Human: There are many cases that imply that Mandy is more than just a young girl. For one, when she smiled once, she caused reality to break apart. Other examples are that she seems to have rather inhuman strength and her high intelligence and skill of manipulation for a girl her age. The fact that she lacks a nose (which is acknowledged in-universe multiple times) is just the icing on the cake.
• Amoral Attorney: Her Halloween costume in "Grim or Gregory?" was a lawyer with monster hands for "rending human flesh".
• Anime Hair: Her hair sticks up at the back and curls a little, resembling devil horns.
• Anti-Hero: She is this at her best moments and straight-up Villain Protagonist at her worst. Despite technically being one of the good guys, she's self-centered and often mean, with many of her more noble or magnanimous moments being at least partly motivated by pragmatism.
• Anti-Role Model: Aside from intelligence, Mandy is not someone girls should look up to.
• 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. She also completely dismisses Billy's claims of Irwin's mom being a mummy as him being stupid as usual and mistaking two words for each other, despite him being surprisingly articulate about it.
• Art Evolution: A minor example. For most of the series she had bright yellow hair, but starting in season six it became more of a pale, bleached blonde.
• Asshole Victim: "Big Boogey Adventure" has her go through two Humiliation Conga moments. The first one is where she gets trapped in a nightmare realm, due to Boogey’s mind rape drug and the second one is where she is forced to witness her worst nightmare (becoming a sweet, chubby old woman and being married to Irwin) and then getting beaten senseless by grizzly bears. However considering what she is described by most of the bad/evil tropes on her page here, this is more of a well-deserved punishment on Mandy for being a really horrible person towards everyone around her including her supposed friends.
• Ax-Crazy: Just like Billy, she is quite fiery and pretty cruel.
• Badass Boast: In "The Nerve", when Billy steals her Nerve, she goes inside his head to get it back. When she confronts her Nerve, it tells her that she’s nothing without it. As she’s about to walk away, the Nerve insults her more, making her think back on how far she was able to get without it, and the Death Glare we all know and love(?) appears on her face, and she gives this to the Nerve.
  Mandy: Now you listen up, pal. You’re not what makes me Mandy! I don’t need some pompous polyp to make me dark, foreboding, and charmingly cynical. I am what makes me Mandy! You got that?
• Badass Normal: She's capable of scaring the crap out of others just by looking at them. That's definitely not something an ordinary little girl without any psychical powers can do. However, later episodes frequently put this trope to question.
• Berserk Button: If the permanent scowl didn't give it away, she already isn't a very easygoing person. The one thing above all, though, that has consistently brought out her worst is being subjected to manipulation.
• Beware the Quiet Ones: A stoic and taciturn kid who is very sadistic.
• Big Damn Heroes: Despite her goal of world domination, she saved the world multiple times. Only because she wants to conquer the world on her own terms.
• Big Bad: She's the main antagonist in The Grim Adventures Of The Kids Next Door.
• Big Good: Downplayed, but played seriously in Nursery Crimes.
• Big "NO!": The reaction at being unluckily transformed into a Wonder Woman parody in the moon episode.
• Big Ol' Eyebrows: Has two large eyebrows.
• Big "SHUT UP!": Done in "Grim For A Day", as an attempt to stop Billy and Grim's incessant, almost quite vitriolic bickering.
• Blood Knight: Exaggerated, by overlapping this with Little Miss Badass; she was really born evil, the reason why she is supposed to be the main antagonist of the franchise.
• Body Horror: She is herself fond of this trope since she took over a giant sentient brain-like alien in one episode.
• Brainwashed and Crazy: Taken to a serious extreme in "Chickenball Z", being tricked by Eris^note In the guise of a Chinese man named Quan Ti. into ruining an entire karate tournament, as a plan to reveal the fact she is really evil enough to accompany her in spreading all the chaos in the world, by dominating the world itself.
• Bratty Half-Pint: A short-statured, rude, and bossy kid who is a Jerkass to everyone.
• Break the Cutie: She does this to her own alternate shadow-self when Grim brings hers and Billy's to life. Originally the exact opposite of her stoic and sociopathic personality, Mandy's slow destruction of her favorite toy in front of her causes Shadow Mandy to snap and become as callous and evil as her original.
• Bright Is Not Good: She may be the inverted version of a Perky Goth. She wears brightly-colored clothes and has a Gothic and morose personality.
• Bullying a Dragon: Numerous characters have tried to get a rise out of her and most of them don't get out alive.
• Can't Live with Them, Can't Live Without Them: She gets annoyed by Billy’s stupidity, but she doesn’t want him dead or out of her life permanently.
• Captain Obvious: She is often treated as a genius for pointing out the obvious because more than half of the time she is surrounded by blundering fools. An example is her reminding Grim to use his scythe to get them out of a tight spot and him enthusiastically calling it a great idea.
• Characterization Marches On: In the early series, Mandy was just a bratty, commanding, and yet calculatingly efficient girl, and even had occasional cases of being Not So Stoic. By the second season, her much more malevolent characterization settled in soon enough and became what even her own family considers to be the living incarnation of evil itself. Best highlighted by When She Smiles; she gets a couple cases early in the series which aren't particularly shocking despite it being a rare event, but later on, smiling is somehow such a physical impossibility that all of reality tears itself asunder in the process.
• Classic Villain: Wrath, with a streak of Pride and a little bit of Envy.
• Cold Ham: Mandy usually speaks in a reserved, emotionless voice. Her angry moments are usually usually subdued without losing her cool, and she only raises her voice if you really piss her off.
• The Comically Serious: She's always overly serious, but is so, in a slapstick and humorous manner.
• 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. Even when she isn't evil, she's pretty scary.
• Creepy Monotone: Her main form of speech. Even exemplified in Scythe For Sale:
  It's cruel and unusual.
• Dark Action Girl: Post-Flanderization. When she fights, she will and no one will stand in her way no matter what.
• Deadpan Snarker: She quite often makes snide remarks about everyone else.
• Death Glare: She has a constant glare that intimidates anyone.
• Depending on the Writer: Her relationship with Hoss Delgado changes almost every time he appears; in some episodes, she's on a first-name basis and generally amicable terms with him, while in others he can't even remember her name and she looks down on him as she does everyone else. In Brown Evil, she actually seems to be a fan of his, and even owns a copy of his tie-in video game.
• Depraved Dwarf: Gender-flipped. Mandy is a short, psychopathic Jerkass who intimidates everyone around her.
• Devilish Hair Horns: Her hairdo is shaped like a pair of horns, making her look fittingly demonic given her demonic personality.
• Did You Just Scam Cthulhu?: This is the entire premise of the show. She made the Grim Reaper her personal servant for all eternity by beating him at a limbo contest.
• The Dreaded: Almost everyone get scared of her just by using words, and she has already taken over the world because everyone fears her. This goes even to the point where Grim of all people has nightmares of her.
• Early Installment Character-Design Difference:
  • In the original short, Billy and Mandy in: Trepanation of the Skull and You, Mandy has a completely different design. She wears a black dress with a white collar, and is much taller with Girlish Pigtails and Black Bead Eyes.
  • In the series proper, the yellow shade of her hair becomes much lighter starting in the sixth season, to the point of almost looking white.
• Emotionless Girl: She seems to have only three major emotions: indifference, disgust, and anger. This trope was exaggerated over time thanks to Flanderization. In season 1, she spoke with more emotion in her voice and was far more prone to looking surprised or worried at the strange things she came across. She also smiled at the end of the first episode and the universe didn't fall apart.
• Enfant Terrible: Young enough and psychopathic enough to qualify.
• Even Evil Has Loved Ones:
  • For all her malicious behavior, she does legitimately care about Grim and Billy, such that life without the latter just isn't the same, and once fell in love with a Gothic guy (though she wasn't proud of it).
  • She loves her parents and have a somewhat normal relationship with them (even straining herself to tell her dad she loves him for Father's Day while also gifting him Grim's services for the day). In "Keeper of the Reaper", she's genuinely dumbstruck that her parents are actually scared of her. While she does push them around and can be cold and disrespectful, her legitimate surprise implies she doesn't actually mean to intimidate or scare her parents.
  • Her dog, Saliva is the only thing she actually isn’t afraid to show any love, emotions, and affection to.
  • She has a decent relationship with Billy’s parents. They’re amongst the least prone to her wrath.
• Even Evil Has Standards:
  • She wants to rule the world and turn it into a dystopia, but she is not okay with cheating.
  • Quite a few of the disturbing and grotesque things that happen to Billy leave her as speechless and horrified as anyone would be. Like him developing a sentient growth in "Billy's Growth Spurt", turning into chocolate and eating himself alive in "Chocolate Sailor", and breaking and twisting his own neck in "Order of the Peanuts".
  • She's actually given a bit of pause when Grim recounts what he did to Jack O'Lantern for outsmarting and pranking him. Though part of that might also be her realizing that Grim could very easily have done the same thing to her and Billy if he hadn't phrased his side of the wager the way he did.
  • Although she initially wanted to watch, she's a little shocked by the horrible things Nergal Junior does to Sperg in revenge for the bullying.
  • Mandy is willing to cause pain and suffering to anyone who bothers her, especially those who cross her. But when Billy begs her to kill Jeff the Spider, Jeff proves to be so peaceful that they end up having a pleasant conversation, after which Mandy leaves with a new sweater Jeff knitted for her and refuses to hurt him.
  • As annoying as she thinks Fred is, she admitted to Mandroid that he didn’t deserve to get hurt.
  • Despite her hatred for humanity and essentially all other forms of life, she won't let it end that easily, at least if it's not on her terms. She refuses to let Pandora's box release the plague that will end humanity, as she resents the fact that her new classmate Pandora tricked her into opening the box. After sealing Pandora into her box, Mandy vows that she will one day unleash her own plague against humanity.
• Evil Genius: She's able to manipulate almost every sentient villain and monster for her own gain, and God help you if you dare try to cross her.
• Evil Hero: Played Straight. She's one of the main characters and fights against evil, but she herself is far from being a straight hero.
• Evil Laugh: In the Grim & Evil episode "Dream A Little Dream", as Grim's dream ends.
• Evil Is Petty: Despite her much loftier ambitions, Mandy is prone to some rather petty and childish actions. Best displayed in "The Greatest Love Story Ever Told Ever"; when Irwin and Nergal Jr. fight over her and end up ruining the Valentine's Day dance, Mandy reveals she knew this would happen and wanted it to, stating that if she can't enjoy Valentine's Day, then nobody should.
• Evil Sounds Deep: A rare female example happens in "Pandora's Lunch Box", as she began to threaten Grim.
• Evil Versus Evil: While she's far from heroic herself, she'll willingly take on malevolent threats.
• Face of an Angel, Mind of a Demon: Do not underestimate her with her cute appearance. She will snap you into pieces if you do it.
• Faux Affably Evil: She’s either this or Affably Evil depending on the episode. This one usually comes into play, especially later on.
• Flanderization:
  • From simply an apathetic, snarky kid with a Hair-Trigger Temper and a bossy streak to an emotionless, evil, and totally sadistic psychopathic Hate Sink trying to take over the world.
  • Her competence was wildly amplified; she went from a smart little girl who could think quick in a pinch to an Evil Genius who not only can pretty much fix or undo anything by just appearing on the scene, but has a very real chance at taking over the world.
• 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 has blonde hair shaped like devil horns and wears pink outfits with flowers on them. She's also the scariest being in the universe.
• Four-Temperament Ensemble: The Choleric. She's task-focused, harsh, and ill-tempered.
• Gagging on Your Words: As revealed in "Sickly Sweet," Mandy is such a jerkass that even something as simple as saying "please" is nearly impossible for her. However, in the Father's Day episode, she is able to strain herself to tell her dad that she loves him.
• Gasshole: In the season 1 story "Tastes Like Chicken", she is repeatedly shown belching with such force that people and objects shiver and tremble as if caught in an earthquake, and displays no shame about burping.
• Genius Bruiser: She is a strong Little Miss Badass who is able to battle monsters with ease, and also has notably superior intelligence to most humans, being able to understand complex theories fairly easily and using her wits and manipulation skills to get her way.
• Gleeful and Grumpy Pairing: The sullen, devious and perpetually frowning Grumpy to Billy's Gleeful, and ironically wears rather a cutesy wardrobe.
• Goth: General consensus is that she's pretty much an example of the "lone psycho" stereotype of goths, albeit one that dresses in an ironic fashion.
• 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 skill at magic, but sporadically gains temporary supernatural and magical powers in episodes.
• Greater-Scope Villain: 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.
• Guile Heroine: She can take down foes both mortal and immortal in seconds.
• Hair-Trigger Temper: Gets pissed very easily. Though in some episodes, she's chillingly stoic instead.
• Hated by All: She is disliked by nearly everybody in the show for her cruel, mean, and bossy attitude; even Grim and Billy, her best friends, don't really like her either. In "Keeper of the Reaper," Billy calls up numerous side characters in the show to voice their negative thoughts about her, and it turns out that even Mandy's own parents don't particularly care for her. This is a given since she herself Hates Everyone Equally.
• Hates Being Touched: Do not touch her unless you wish to be bitten or punched.
• Hates Everyone Equally: It goes without saying. While she doesn't hold any prejudices, she's still dismissive and condescending at best to anyone who isn't her. She even lampshades it in “Pandora’s Lunch Box”. The feeling is mutually returned from everybody.
• Hate Sink: She becomes this in the episodes that require her to be the main antagonist and to not have any Pet the Dog moments, especially in the last season. Some of the worst examples include "Scary Poppins", "The Greatest Love Story Ever Told", "The Incredible Shrinking Mandy" and "The Grim Adventures of the Kids Next Door."
• Heroic Willpower: Though in her case it's more like Villainous Willpower, Mandy was able to overwrite the mind of the brain-eating alien when it ate hers, and she was immune to Eris' mind-controlling teddy bears since they "don't work on people who think". However, it seems even her resistance has limits, as Irwin was able to use Grim's scythe to make her fall in love with him.
• Hidden Depths:
  • The prospect of living a life of quiet desperation is the only thing that can shake Mandy to her core. This may explain why she is so determined to Take Over the World and take down anyone in her way,
  • She seems to actually care for Grim and Billy, as seen in "Big Boogey Adventure" when she was upset when it seemed that Billy may actually have been killed by the Kraken and her worst nightmare reveals how meaningful the two really are to her.
  • The Very Special Episode "My Fair Mandy" reveals that she cares about what people think of her and is insecure about how she looks when Mindy keeps calling her ugly. The whole reason she entered the pageant in the first place was to prove to everyone that she’s beautiful.
• Hijacking Cthulhu:
  • In "Little Rock of Horror", 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 it painfully dies off and its aura immediately changes to resemble Mandy. Her only explanation is that her brain and mind were 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 in the above example, her will takes over the countless others that made up the Delightful Reaper and it takes on her appearance.
• Horrifying the Horror: Despite seemingly being an ordinary human child, she manages to scare quite a few supernatural menaces. On the other hand, she's sometimes on the receiving end of this trope; if something actually manages to scare her, you know things have just gone pear-shaped.
• I'm a Humanitarian: Invoked in the first season episode "Tastes Like Chicken", where a combination of Billy's friends and family being mysteriously absent, Mandy repeatedly burping loudly, and Mandy telling Billy she's having him for dinner makes Billy assume that Mandy is a cannibal who has eaten everybody else he knows. Then it turns out that Billy was just being his usual dimwit self and everybody was just preparing for a surprise birthday party for Billy at Mandy's house. But right before the episode ends, Billy wonders where Irwin is... cue a massive belch from Mandy, who then spits out Irwin's glasses and, looking right at Billy, wonders how those got in her mouth...
• Humiliation Conga: The episode "Zip Your Fly!" is a big instant of suffering a series of undignified predicaments for Mandy. After she uses Grim's magical zipper to take her head off, a fly gets in the way when she zips it back. She switches heads with it, having to move with a comically small body. She then gets stuck in fly paper and Harold attempts to flush her down the toilet. She lost half the zipper in garbage and ended up eating an entire junkyard to find it.
• Hypocritical Heartwarming: She gets angry whenever somebody abuses Billy... somebody other than her, that is.
• I Can Rule Alone: In "Happy Huggy Stuffy Bears," Eris tries to convince Mandy to join forces with her when she takes over the world. Mandy briefly considers it, but ultimately declines when she finds out she'd only be the second most powerful person on Earth.
  Mandy: Sorry, Eris. But I don't share.
• Improbable Weapon User: In the Cartoon Network game "The Fight Before Christmas", she uses a toy hammer, a toy plane, a doll^note which she hurls like a throwing star, 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 angry tree stump. While she is a bit odd-looking due to her hairstyle and lack of a nose, few would call her ugly.
• Ink-Suit Actor: Hilariously Inverted; she, in fact, looks a lot like a younger version of her voice actress, except the fact her hair is dyed blonde, as her nose doesn't REALLY exist.
• Insufferable Genius: Exaggerated; she's full of herself to the point of believing she deserves to rule the world. Also, she is quite diabolical.
• Ironic Name: Her name means "adorable" or "lovable", despite her bitter and cynical attitude.
• 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. Her cold, no-nonsense personality and determination to get her way no matter what definitely peg her as this kind of leader.
• Jedi Mind Trick: It appears that even if her natural terrifying aura isn't enough to control a person through fear alone (such as when Grim magically increased her parents' courage against her), she can directly influence people into doing what she wants. Whether this power is supernatural or she's just so finely honed her ability to scare others that she can force them into blind obedience if she focuses on them is up to speculation.
• Jerk with a Heart of Gold: Sometimes, she'll be shown to genuinely care about the people around her or do nice things that don't benefit her in any way. Granted, she's still a snarky jerk even when she's written like this.
• Jerk with a Heart of Jerk: Probably her most frequent characterization. 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 and beyond, Mandy will usually have a selfish motive in mind such as not wanting the world she intends to rule be destroyed.
• 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.
• Karmic Transformation: In "Sickly Sweet", she's tricked into wearing a mask that will progressively turn her into an ugly beast the more she acts like a jerkass. It even makes her sound like a literal ass (the animal).
• Kick the Dog: She can be incredibly cruel, especially to Grim, Billy, and Irwin.
  • As if taking Gregory's Halloween candy in "Grim or Gregory?" wasn't enough, she also admits to not caring that she made the kid cry when Billy admonishes her for it.
  • Another rather cruel moment from Mandy occurs in "The Greatest Love Story Ever Told Ever", where she reveals to Irwin and Nergal Jr. that she knew they would fight over her and ruin the Valentine's Day school dance and that this was exactly what she wanted to happen, rationalizing that if she can't enjoy Valentine's Day, no one else should.
  • Stealing the Golden Nose of Chipotle for her own ends and leaving Grim, Billy, and Harold behind in Mexico in "El Dia de Los Muertos Estupidos".
• Knight of Cerebus: Exactly What It Says on the Tin; she is irredeemably dark and cruel, even moreso than Nergal Jr..
• Lack of Empathy: Whatever empathy she has is locked away in the cold dark recesses of her soul.
• Laughably Evil: Downplayed; while she's not an overly comedic character, she still has her moments of rather cartoonish maturity, and mostly provides comic relief through snide commentary.
• 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: This line pretty much exemplifies it:
  "Power tools in the dark? Darwin should be paying you two goons royalties."
• Madden Into Misanthropy: It's implied that two things helped complete Mandy's metamorphosis into the cynical tyrant we all know and tolerate: Mindy's inane, meaningless prattle, and having to deal with the perpetually moronic Billy every single day of her life.
• Manipulative Bitch: She's manipulated the Grim Reaper, Eris, Hoss, and sometimes even Irwin to do her bidding.
• The Napoleon: She's the same height as Billy, enormously ambitious, and so sociopathic that even Grim is afraid of her.
• 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.
• No Celebrities Were Harmed: According to the Word of God, her appearance is basically just a caricature of Kari Wahlgren ^note Who also happens to be a friend of Mandy's voice actress.
• Nominal Hero: Anytime she does something good, it's usually for her own benefit.
• The Noseless: She has no nose, but she does have nostrils.
• Not So Stoic: Some things can get under her skin, if rarely. Even she wasn't immune to being called ugly or unattractive, and the beginning of the series even had her spooked out by Grim (briefly) or the occasional weirdness much more readily compared to later.
• Obviously Evil: She is so evil, that her most intended role is to be the series' overarching antagonist. Cause you know, she is the king/queen of the demons.
• Odd Friendship: She willingly hangs out with Billy, despite the two of them being polar opposites.
• One-Winged Angel: Her future self from the episode "Mandy the Merciless", where she has become a giant worm.
• Only in It for the Money: Offering cash is a, somewhat, reliable way to convince her to act.
• Only Known by Their Nickname: Her actual name is Amanda, but everyone calls her Mandy.
• The Only One Allowed to Defeat You: She saves Billy from numerous threats simply because she wants to be the only one to torment and abuse him.
• Only Sane by Comparison: She is a cruel and manipulative Tiny Tyrannical Girl, but she's also the most intelligent and mature character on the show, as well as the most competent. It helps that she has a very serious personality and most of the time she's Surrounded by Idiots, especially her stupid best friend Billy, her ridiculous Abhorrent Admirer Irwin, and her silly and obnoxious rival Mindy. Even Grim has his dumb moments and comes off as a loser compared to Mandy.
• O.O.C. Is Serious Business: If she's ever genuinely shocked, scared, or even sad about something, you know things have gone off the rails.
• Out of Focus: As the show shifts into a Denser and Wackier direction starting in season 3, Mandy receives far less screen time—she has fewer episodes highlighting her evil schemes and she more often becomes a tagalong for Billy's adventures.
• Perky Goth: Completely Inverted; she dresses like a standard little girl, but embodies the Lone Psycho Goth stereotype.
• Perpetual Frowner: It's mentioned on more than one occasion that she never smiles; in fact, it's revealed in "My Fair Mandy" that if she does smile, it will cause a Reality-Breaking Paradox.
• 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).
  • In an early comic, she thanked Billy's parents for driving her, Billy, and Grim to the bowling alley.
  • Her treatment of Jeff, of all people is this, as she's surprisingly tolerant and patient with him, was unable to bring herself to squish him in his debut episode and even helps him stand up for himself in Spider's Little Daddy, admittedly with less than stellar results, but not because she wasn't trying.
• Pink Girl, Blue Boy: The pink girl to Billy's blue boy. She wears a pink dress, while Billy wears blue jeans and a shirt with a blue stripe.
• Pink Means Feminine: Averted. Mandy usually wears a pink dress, but she isn't that feminine.
• Pint-Sized Powerhouse: She is about the same size as Billy, and she's a competent fighter, sometimes to the extent of being apparently superhuman.
• Platonic Life-Partners: With Billy. They have been best friends, if you can call them friends, since they were infants.
• 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.
• Psycho Pink: Mandy usually wears a pink dress, but she's a sociopathic misanthrope.
• Psychotic Smirk: By way of Early-Installment Weirdness, but before it became a major defining trait of hers that she never smiles, she had a couple evil grins in response to Grim's suffering in "Meet the Reaper" and "Look Alive!".
• Raised by Wolves: Played for laughs. Her parents claim that wolves came to raise her as her own when she was born.
• Red Oni, Blue Oni: She's the blue oni to Billy's red oni. She is stoic and responsible while Billy is impulsive and emotional. Also an inverted case of Savvy Guy, Energetic Girl.
• Satanic Archetype: There's actually a popular fan theory claiming that she's actually a spawn of Satan and/or even a reincarnation of Satan's only child, The Antichrist, given the fact that her hairstyle looks like a pair of horns, befitting her demonic personality, drawn by being more cruel and sociopathic than Grim himself.
• Shorter Means Smarter: Played Straight. She is a pint-sized kid, but she is also indeed smarter than everyone from this show who isn't smart enough.
• Sliding Scale of Idealism Versus Cynicism: In this scale, she is far at the cynical end.
• Smart Jerk and Nice Moron: The Smart Jerk to Billy’s Nice Moron. She’s a straight-A (or rather, "A+++++++") student, who hates just about everyone else, and finds the idea of having a crush on someone to be repulsive.
• Smug Snake: In early episodes, she had some smarmy tendencies, though she was usually able to back up her ego even back then. While she was still prideful later on, she came off as less smug and more ambitious.
• Sociopathic Hero: She enjoys people's pain and is one of the main protagonists.
• The Spock: Intelligent and deadpan.
• Spoiled Brat: To an extent. Her mother showers her with money, clothes, gifts, and jewelry in order to avoid her wrath.
• The Stoic: She never smiles fully at all. Because if she did, reality itself would be torn asunder.
• Sugar-and-Ice Personality: She is actually shown to be somewhat caring and even passionate in some episodes despite usually coming off as cold and uncaring.
• Surrounded by Idiots: As seen in Captain Obvious above, she seems the only person with a brain most of the time.
• Suspiciously Specific Denial: She does not have a fear of professional figure skaters. She just doesn't trust the way they spin, is all.
• Take Over the World: Her long-term goal is to be supreme ruler of the Earth.
• Talking the Monster to Death:
  • Gives one to the titular animal of the episode "Duck!":
    Mandy: You think you've won? That you've broken me? Humiliated me? Driven me crazy? When every day of my life I've had to deal with... (cut to a montage of Billy doing random stupidities). Compared to that, you're just an insignificant pimple on the butt of the world's smallest amoeba! You have no power over me.
    The duck's Villainous BSoD is so great that it erases itself from existence. With an actual fart no less.
  • Another epic one occurred in "Detention X", after being unwillingly punished by Grim by being sent to the Detention Dimension:
    Mandy: You set me up. You took this stupid job just so you could finally get rid of me and Billy.
    Grim: I know! Pretty smart eh?
    Mandy: No! (She grabs Grim, and gives him a Death Glare) That's the dumbest mistake you'll ever make. Because now, I hate you in a way I never knew was seemingly possible. Take a good long look at me, Grim, you won't see me again until the day I take your world away from you. (Mandy gets sent to the Detention Dimension, leaving Grim, clotheless, but his underpants. and Grim screams.)
• Tiny Tyrannical Girl: She's a little girl who doesn't take guff from anyone. 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. She's also occasionally shown wearing face masks or forcing Grim to give her manicures, suggesting that she has some amount of interest in beauty treatment.
• Tomboy and Girly Girl: Tomboy to Mindy's Girly Girl. Mandy is a Little Miss Badass with a dark and unfeminine personality, Mindy is an Alpha Bitch who mostly cares about appearance and popularity.
• Took a Level in Badass: At the beginning of the series, Mandy's methods of overcoming obstacles usually came from either outsmarting a foe or just simply Cutting the Knot (like kicking Nergal in the shin), but she was as exposed to threats as Billy and Grim were and didn't seem like anything more than an unusually intelligent child in that regard. Then she became so terrifying that she could intimidate supernatural creatures and interdimensional beings into doing her bidding and genuinely took a few notches in badass even if she usually doesn't try to pick a fight herself.
• Took a Level in Jerkass: She develops more and more into a disrespectful, heartless and unsympathetic jerk season after season. By "Sickly Sweet", she's become such an unpleasant person that even trying to do something nice is nearly impossible for her, to the point where she has physical difficulty just attempting to say "please".
• To the Pain: A rather horrifying example happened in "Pandora’s Lunch Box”:
  Mandy: Grim, you're gonna tell me how to stop her, and you're gonna do it now.
  Grim: And why should I do that?
  Mandy: (angrily grabbing Grim by the neck of his cloak) You're gonna tell it! Or so help me, (amplified with rage) I will pull your stupid cloak through your eyes and use it as reins to ride your bony butt back to the darkest pits of the Underworld from whence you came!
  Grim: Okay, okay! (quietly) You little psychopath.
• Uncanny Valley Girl: Rather it was intentional or not, Mandy in the original short film. She's a Genki Girl that comes across as creepy to most viewers. She also seems to be a bit too happy trying to convince Billy to drill a hole in his skull.
• Ungrateful Bitch: "Thanks" isn’t a word in Mandy's vocabulary.
• Unsympathetic Comedy Protagonist: She generally has no positive qualities beyond being intelligent and competent, both of which she uses to make the world a bad place. Speaking of this, she's so sociopathic, that Grim of all people is so afraid of her, enough to make him look like a nice guy (or at least a friendly Punch-Clock Villain) in comparison.
• Vile Villain, Saccharine Show: The show, despite being about everything dark and cynical, is still fairly bittersweet; but Mandy is pretty terrifying, especially in contrast to other antagonists.
• Villains Out Shopping: Whenever she isn't scheming, she's just spending time with Grim and Billy at their house.
• Villain Protagonist: She's one of the main characters and is so evil that she makes the personification of death look like a nice guy in comparison.
• Villainous Breakdown: Whenever her Berserk Button is pushed. Best displayed in "Detention X", where she starts yelling at Grim for manipulating her into being sent to the Detention Dimension.
• Vocal Evolution: Mandy becomes much more deadpan in tone in later episodes.
• 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, most likely because none of those instances force her to do so.
• Why Did It Have to Be Snakes?:
  • In "Attack of the Clowns", both Billy and Grim claim that she's afraid of professional figure skaters, though she suspiciously denies this, only saying she merely distrusts how they skate.
  • Her true worst fear is living a quiet, unremarkable life and being married to Irwin.
• 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 on his baseball team despite her athleticism because she was 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.

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