Characters / Mystery Skulls Animated

Characters found in Mystery Skulls Animated.

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General

• Color-Coded Characters:
  • Vivi is represented by the color of blue for femininity and calm. It also is the main color of her father and her paternal grandmother.
  • Arthur is represented by the colors yellow and orange, conveying both a sense of warmth and cowardice.
  • Mystery's color motif is black and red symbolizing both power and mystery.
  • Lewis is represented by shades of magenta for the supernatural and romantic connotations.
  • Shiromori's color motif is white a color associated with that of death and the supernatural in Japanese mythology.
• Elemental Motifs: It's subtle, but certain characters can be assigned elemental motifs.
  • Lewis is obviously fire. He has fire powers, a firey temperament and his last name is Pepper, which is well-known for burning in the mouth.
  • Vivi is ice. She has a blue color palette, her last name "Yukino" means "ice" and the bat she used to fend off Shiromori briefly turned into a snowflake patterned sword.
  • Arthur might be electricity. He has Spiky Hair like someone who was shocked, is the most energized to run away and is shown working as a mechanic. He also has yellow hair.
  • Shiromori is a plant demon. Her name means "White Forest", she can regrow any body part and grow flowers from her hand.
• Expies: The Mystery Skulls to a certain group of meddling kids that solve mysteries.
  • Lewis had traits of Fred in life, being the tallest member of the squad (complete with ascot), and was in a relationship with one of the members, Vivi.
  • Vivi is a mix of Daphne and Velma, being a nerdy girl with a sense of style, a close companion to the group's pet and coward, and carries the Blake family trait of getting tied up in the villains' shenanigans.
  • Arthur serves as the group's Shaggy, with his closeness to Mystery (although Vivi is Mystery's owner) and cowardly tendencies.
  • Mystery to Scooby as the Team Pet with human-like intelligence, with a supernatural secret similar to Scooby's own paranormal origins in Scooby-Doo! Mystery Incorporated.
• Fire, Ice, Lightning: In the case of Vivi and Lewis' romantic relationship, they would be a Fire/Ice Duo (and in turn, doubles as Opposites Attract). Arthur is lightning, as potentially symbolized by his yellow colour scheme, affinity with technology, and sparks-shooting mechanical arm.
• Flower Motifs: Shiromori's flower representing Vivi is a blue orchid, Arthur's is a yellow and orange sunflower, Mystery's is a red lotus whose petals look like nine tails, and Lewis' is a purple rose (which, among other things, can symbolize enchantment and mystery).
• Personality Blood Types: Vivi's blood type is type B, Arthur is type A, and Lewis was O.

The Mystery Skulls

Arthur Kingsmen

♫ Cause the world might do me in... ♫

Voiced by: Austin Lee Matthews

The group's reluctant, cowardly mechanic and driver.

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• Ambiguously Gay: While it was initially ambiguous as to what he exactly resented about Lewis' and Vivi's relationship, it can be seen in the Hellbent flashbacks that he seems to be craving specifically for Lewis' attention.
• Ambiguously Human: He has a yellow tongue, unlike the rest of the human characters. Although this might be just a very minor case of Amazing Technicolor Population. This characteristic is shared by his uncle Lance, so if they’re inhuman, it’s something genetic.
• Anti-Magic: Arthur's prosthetic arm has been shown to interact oddly with the various supernatural occurrences in Mystery Skulls, either proving immune to them or disrupting them upon contact. It doesn't appear in the mirror in Ghost, upon pounding the dashboard in frustration it disrupts Lewis' ghostly abilities and restarts the van (though this also disables the arm for most of the video), and touching a ghostly Lewis with it reveals his true face. It starts freaking out when ??? possesses Mystery.
• Artificial Limbs: Arthur's left arm is robotic because Mystery tore off the original when it was possessed by whatever was in the cave.
• Big Ol' Eyebrows: They're nearly as big as his eyes.
• Black Eyes of Crazy: When he's possessed, his eye's sclera on the corrupted side of his body turns black.
• Character Tics: Tends to grab his left arm by the elbow a lot — especially when Mystery is around.
• Cosmic Plaything: Let's face it— Arthur's luck is abysmal. He has a malevolent spirit possess him and kill his best friend, gets his arm torn off to stop the possession, incurs the wrath of said friend's equally as malevolent spirit, gets his car totaled, and above all nearly dies when the second spirit finally catches up to him (which, by the way, he was only spared from because of a sudden Heel Realization and really good timing from his uncle).
• Demonic Possession: He was possessed by the green spirit, which cost him his arm and killed Lewis.
• Early Installment Character-Design Difference: Downplayed, Arthur's new character puppet vs his old one. Besides the Art Evolution, there's not much of a change besides the new pin-back buttons.
• Exhausted Eye Bags: In Freaking Out and Hellbent, probably due to the fear and trauma of what happened in Ghost. The "Every Note" interlude and a Freeze-Frame Bonus in Freaking Out suggest Arthur's been taking primary duty of tracking down Lewis, which is another likely reason for his exhaustion.
  • Losing My Mind shows that he's had trouble sleeping for a long time, not only as a result of looking for Lewis but general PTSD about how he lost his arm (although he doesn't quite remember how it happened).
• Family Theme Naming: His family and relatives are all named after Arthurian Legend, with him named after the Once and Future King himself.
• Fire-Breathing Diner: In a blink and you'll miss it moment, one of Lewis' sisters pours hot sauce in Arthur's milkshake.
• Forgets to Eat: Ironically enough for a Shaggy-expy. In the prequel comic, it's mentioned that he hasn't slept in three days, and has been running solely on energy drinks. Vivi's reaction implies this is a regular occurrence.
• Gadgeteer Genius: He is the one who built his own robotic arm, as well as the prosthesis for Galaham.
• Lovable Coward: Arthur is the first to freak out and run in the slightest hint of danger — a trait he shares with Shaggy, his inspiration. His cowardice is exploited by Lewis in Hellbent when he deliberately puts scary things in Arthur's path to lead him into a death trap on the "clear" routes.
• Must Have Caffeine: The prequel comic shows that he has stopped sleeping and eating properly, sustaining himself entirely on energy drinks.
• My God, What Have I Done?: The part of him that wasn't possessed during the incident was absolutely distraught at causing his best friend's death. While one half is smiling maniacally, the other is crying in visible guilt and terror.
• Nervous Wreck: Deconstructed somewhat. While part of it comes from being a Shaggy counterpart, having killed his friend, possibly suffering Laser-Guided Amnesia and not remembering, losing his arm, being sleep deprived, seemingly seeing a beloved pet turn into a giant monster and being so shaken he's afraid to touch said pet can't be helping matters.
• Nice Job Breaking It, Hero: Arthur takes advantage of Lewis' hesitation to grab Vivi and get the hell out of the mansion. This nearly gets the gang killed due to Lewis unleashing his rage in an explosion of fire, leaves Lewis heartbroken, and his soul likely still restless — an instance where the Lovable Coward tendencies he inherited from Shaggy have adverse consequences. Also Justified since from Arthur's point of view, the pink wraith wants him dead. Arthur has no idea that doesn't also extend to Vivi at this point in their adventure.
• Poor Communication Kills: It's clear that he was upset with Vivi's and Lewis' relationship, though if this was because of jealousy and/or being the Third Wheel is debatable. Regardless it definitely wasn't bad enough for Arthur to want Lewis dead, but his feelings may have made him susceptible to possession, which could possibly have been prevented if he just came forth with his feelings rather than just internalize them.
• Sanity Slippage: In Freaking Out he hallucinates Mystery in his larger kitsune form from lack of sleep (or possibly the trauma/guilt he feels after what happened to Lewis).
• Screams Like a Little Girl: As the series's resident scaredy-cat, this is kind of expected of him. We actually get to hear his screaming (for very understandable reasons) at the end of "The Future."
• Strong Family Resemblance: He and his uncle Lance are strikingly similar in terms of color scheme, hair, and costume. Hell, even his pet hamster gets in on it!
• Spiky Hair: Very much so. It's so clearly gel and such a part of his character that at least one fanfic author apologized for him having a different hairstyle that didn't have the spikes even though their reason was because the setting didn't have anything that could logically stand in for hair gel.
• Suddenly Speaking: He gets his first complete dialogue in the prequel comics. Prior to that, it was either mimed, implied, or left to brief soundbytes.
• Suddenly Voiced:
  • He calls out to Lewis at the beginning of The Future like at the end of Hellbent, only this time you can hear his voice. He also lets out a high-pitched scream when Mystery gets possessed by ???
  • He also sighs at the beginning of "Hellbent" after he finishes repairing the van.
• The Team Normal: Between Mystery being a Kitsune, Vivi gaining her ancestor's ice powers, and Lewis being a ghost, Arthur is the only member who isn't supernatural at all. In fact, his cybernetic arm, his most abnormal trait, often reacts poorly when directly exposed to the supernatural.
• Transformation of the Possessed: He starts turning green when he's possessed by the spirit of the cave.
• Trauma-Induced Amnesia: "Freaking Out" implies that he doesn't remember what happened to Lewis, as they are apparently searching for him. Compared to Vivi it doesn't seem to be induced either, but a genuine stress reaction. Which would also make sense given his nature as a Nervous Wreck.
• Unusual Eyebrows: He has massive heart shaped eyebrows.

Vivi Yukino

♫ It's all right cause I'm with friends. ♫

Voiced by: Amanda Kay

The leader of the Mystery Skulls paranormal investigation group.

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• A Girl and Her X: A girl and her dog. Mystery's her pet.
• Asian and Nerdy: Japanese horror and mystery enthusiast that works in a store that deals exclusively in horror themed novels and comic books.
• Badass Adorable: She goes toe to toe with Shiromori in Hellbent with nothing more than a metal bat.
• Batter Up!: When she chooses to fight, she does so with the baseball bat she keeps by her side.
• Bequeathed Power: Implied to have been given some kind of psychic ability by witnessing Lewis' death. Would make sense, since they were both apparently very close and Lewis apparently gained incredible supernatural powers at the moment of death. Possibly averted in Hellbent. When she blocks Shiromori's scissors with a baseball bat, it starts to glow pale blue for a short time — like her ancestor's katana. Right after that she connects with her ancestors spirit and gain the ability to freeze whatever she hits with the bat.
• Bespectacled Cutie: She's an endearingly geeky and nerdy Badass Adorable girl, and she wears Nerd Glasses to emphasize it.
• Big Eater: Only surpassed by Mystery's appetite.
• But Not Too Foreign: Vivi's mother is American, and her father is Japanese.
• Composite Character: She takes Daphne's role and Velma's appearance, along with Shaggy's appetite and relationship with the Scooby-counterpart.
• Curtains Match the Window: Vivi's hair and eyes are both blue.
• Generation Xerox: Just like Mushi in the distant past, Vivi ends up having to battle Shiromori at Mystery's side. Down to using a metallic weapon to channel and direct her ice powers. And sadly, The Stinger at the end of the The Future-video implies that also just like Mushi, she will have to fight a blood-thirsty Mystery in his Kitsune-form.
• Go Through Me: Vivi tries this to save Arthur from Lewis; it works because unknown to her, the ghost is her now-undead boyfriend.
• Huge Guy, Tiny Girl: Vivi is about five foot and four inches tall compared to the seven foot and three inches Lewis.
• An Ice Person: In The Future, Vivi seems to reconnect with the warrior of the past. By doing so, her baseball bat now channels ice magic, freezing whatever she hits.
• Identical Granddaughter: Hellbent shows that a Ninja girl who shares a striking resemblance to Vivi once had serious beef with Shiromori and Mystery in the distant past.
• Laser-Guided Amnesia: Its implied that this has been done to her regarding Lewis' death.
• The Leader: Of the Mystery Skulls, and has the confidence and love of the supernatural to back it up.
• Meaningful Name: Her last name, Yukino, has the word for "snow" in it. The association with cold is fitting given her primarily blue color scheme. Becomes even moreso when she connects with the spirit of her ancestor and gains ice powers.
• Mind-Control Eyes: In Freaking Out, there's a quick shot of Vivi with pink eyes and a blank expression before she snaps back to her normal excitable self. Later in the video, her eyes glow pink while she's sleeping, which seems to cause the picture of Lewis on Arthur's desktop to disappear.
• Morality Pet: Unknowingly for Lewis.
• Nerd Glasses: She's takes at least half of her character inspiration from Velma The Smart Girl while also exhibiting geeky hobbies, and she wears half-moon, bright magenta lenses.
• Nightmare Fetishist: Vivi's initially excited and intrigued when paranormal things started happening around her, even while Arthur and Mystery start to get freaked out. When she sees Shiromori in Hellbent she seems fascinated by her, rather than scared — at least at first. Her profile states horror is her favorite genre.
• Ninja: Shiromori briefly sees her as one in Hellbent.
• Paper Talisman: Has two of these stuck onto her baseball bat.
• Precision F-Strike: In The Stinger for The Future, Vivi asks "What the fuck?" once Mystery's been possessed (or at least tries to before being interrupted by Arthur's terrified screaming).
• Pink Girl, Blue Boy: Inverted. Vivi's associated colors are blue, while Lewis' associated colors are magenta.
• True Blue Femininity: She's blue all over.
• Spell Blade: When she blocks Shiromori's shears in Hellbent, her baseball bat becomes wreathed in a blue aura that is likely frost magic.
• Squee: Given her love of horror, it's a given she reacts this way to paranormal happenings. At least, when they're not trying to kill her.
• Strong Family Resemblance: Hellbent indicates she's descended from a blue-haired Demon Slaying Ninja who fought and subdued Mystery; and resembles her ancestor enough for Shiromori to mistake them.
• Suddenly Voiced: Nearly drops an F-bomb at the end of The Future before Arthur starts screaming.

Mystery

♫ Maybe there's no guarantee it doesn't matter. ♫

Vivi's "dog", also a member of the group. Something's up with him.

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• Abusive Parents: In a sense, to his creation Shiromori — her flashbacks in Hellbent indicate he had her do his bidding in the fight with Mushi, and then allowed her to get cut down as collateral damage without a second thought. It's implied in The Future that he's grown to regret this.
• Accessory-Wearing Cartoon Animal: Those snazzy teashade sunglasses that he keeps on the bridge of his nose.
• Amazing Technicolor Wildlife: He is a "dog" with red and black Spiky Hair.
• An Arm and a Leg: A flashback in Hellbent implies that he lost at least two of his tails at one point, given that he had nine then but six or seven now.
• Author Avatar: At least partly, he's based off of MysteryBen's own persona from his pre-Ghost work.
• Ambiguously Evil: It's made very clear there's something dark and ominous about him, but so far he's helped the other protagonists. Hellbent implies that he was originally malevolent prior to his battle with Vivi's ancestor, but has mellowed out over the years.
• Asian Fox Spirit: He's a kitsune disguised as a dog, with "Hellbent" indicating that he was captured by one of Vivi's ancestors.
• Being Good Sucks: He convinces Vivi to spare Shiromori after defeating her and just walk away with him. Shiromori thanks him by attacking them from behind in a jealous rage. Mystery ends up losing his life and coming back as Murder Mystery in the ensuing scuffle.
• Big Eater: Apparently thousand-year-old yokai have very big appetites. He and Vivi were about to help themselves to massive sandwiches, with Mystery's being far larger than hers.
• Blood Magic: In the flashback scenes in Hellbent, it's shown he created Shiromori by dripping his blood onto a flower, causing it to grow into a tree.
• Blue-and-Orange Morality: Implied heavily that, like most yokai, he has a completely alien moral system. However, his current mortal incarnation seems far more laid back — at least, until you threaten Vivi. Then the disguise comes off...
• Came Back Wrong: In The Future, he sacrifices himself to help Vivi kill Shiromori, but comes back with what appears to be an Evil Makeover courtesy of Demonic Possession.
• Canine Companion: Of Vivi. Or at least, that's what he's moonlighting as right now...
• Cheshire Cat Grin: Mystery as a yokai sports a really disturbing one with More Teeth than the Osmond Family, as he confronts Vivi's ancestor. Exactly why he is grinning is entirely up to the viewer, but theories abound (as can be read elsewhere in this very entry!)
• Dark and Troubled Past: He has a mysterious history before joining the team; "You can't run forever, mutt". The Freeze-Frame Bonus — stills in Hellbent add to this, showing that he was the one who created Shiromori.
• Death Glare: At the end of Hellbent, as Shiromori is about to impale Vivi, he has a furious expression with glowing red eyes.
• Defeat Means Friendship: Heavily implied to have been the outcome of his fight with Vivi's ancestor, Mushi.
• Emotional Powers: His repressed tails seem to activate in moments of extreme distress. In The Future, he gets two of them back when he sees Vivi hurt, and he regains his very last one when he watches Shiromori revert to wood.
• Evil Makeover: After being possessed by the spirit from the cave the end of The Future, he gains a green hue, his dog tag turns from a "?" into a "!?", and his glasses turn into a pair of Gurren Lagann-esque Sinister Shades.
• Goggles Do Nothing: Wears a tiny pair of yellow glasses, though they can't possibly be useful to him.
• Healing Factor: Possibly. At one point in the mansion, the group is attacked by a sword-wielding Animated Armor, the others dodge but Mystery seems to lose his head. Arthur and Vivi are shocked for a moment before Mystery's head pops back up. This may be just due to Rule of Funny, but being a mythical entity, he might really be able to regrow his head.
• Heel–Face Turn: The flashback images in Hellbent indicate that he was malevolent in the past, regarding Vivi's ninja ancestor with a Slasher Smile and trying to kill her. In the present, he's anything but. In The Future however, after seemingly pulling a Heroic Sacrifice, he comes back to life with what appears to be an Evil Makeover, courtesy of some Demonic Possesion.
• Intellectual Animal: Being a Scooby Expy, he is a dog that clearly behaves like a human, would likely talk if only the series had any dialogue — and yes, he is more competent than the human protagonists even though they're not aware of it. This is a Justified Trope, since in fact he is Kitsune not really a dog at all.
• Irony: In mythology, Kitsune have a crippling fear of dogs. So it's rather curious that he'd take the form of one himself.
• Meaningful Name: Not only is he the mascot of the Mystery Skulls, but on top of that he is a very mysterious character himself and is not at all what he seems.
  • While possessed by ???, he is known as "Murder Mystery".
• Multiple-Tailed Beast: Mystery's true form is a multi-tailed kitsune — though he had nine tails in the past, he only had six during the flashback in Ghost, indicating three were sealed. The Future confirms this, as he gets them all back in quick succession during the fight with Shiromori.
• My Greatest Failure: The Future heavily implies he sees his previous mistreatment of Shiromori as this, notably getting Vivi to spare her when she's at their mercy.
• Mysterious Past: We know nothing about why Shiromori is chasing him until Hellbent reveals brief glimpses of his past.
• Non-Standard Character Design: While still somewhat stylized, his true form (as revealed in Freaking Out) is drawn with less cartoonish proportions than both his normal form and everyone else.
• Oh, Crap!: Mystery is shown to be very worried when he realizes Shiromori just picked up his trail.
• Really 700 Years Old: Implied. His profile page states his age as "...'7'", clearly concealing something. He is likely far older than any dog could be, and being a magical entity he may even be hundreds of years old.
• Red Eyes, Take Warning: Mystery has red eyes. It simply appears to be because of his Color Motif being red at first, but later on he's revealed to be a Kitsune, and far more in the know than you'd expect. When this is revealed, his eyes glow red.
• Spell My Name With An S: There was initially some debate over whether his name was Mystery or Ben, though Word of God has since specified that it's Mystery.
• Stealth Pun: Mystery the "dog" is actually a nine-tailed fox spirit, commonly referred to as a kitsune in the West. However, another name for it in the east is kyuubi — nine-tails. Hence, he is Kyuubi-Doo.
• Trademark Favorite Food: His is listed as "...'chicken'", which has interesting implications. Given that he is a Yōkai that seemingly used to be malicious, said implications could get pretty dark. On a lighter note, it might also be a Stealth Pun, since Mystery severed Arthur's arm. Arthur is a bit of a coward, i.e. a "chicken".
• Truly Single Parent: His blood making Shiromori could qualify him as her "father".
• Walking Spoiler: Of the three main characters, Mystery is probably the most spoilerrific. It is difficult to discuss him at all without giving away the First-Episode Twist that he is a kitsune taking the shape of a dog. Beyond that, he has several other bombshell reveals attached to him: he is the creator of Shiromori, seemingly used to be evil, and most crucially, at the climax of "The Future", he gets possessed by ??? to confront the group as the fearsome "Murder Mystery".

Antagonists

Lewis Pepper

♫ And I'm feeling like a ghost. ♫

A ghost with fire-based powers who antagonizes Vivi, Arthur, and Mystery. He's revealed midway through "Ghost" to have been a former member of the Mystery Skulls and been dating Vivi, but he was killed by a possessed Arthur and now seeks Revenge.

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• Ambiguously Brown: Before his death. When asked about this, Ben stated that he hasn't decided on his ethnicity yet.
• Anti-Villain: He's genuinely antagonistic towards Arthur, but it's only because he's the one that killed him (sort of) and he'd rather not hurt Vivi.
• Angst Nuke: Near the end of "Ghost", Arthur pulling Vivi away causes him to literally explode with rage.
• Attack Its Weak Point: Downplayed, as it's not enough to genuinely damage him, but Lewis' heart-shaped locket (and his left side in general) seems to be a weak spot. When Lance shoots it during "The Future" Lewis' copy of the cave he died in is instantly dispelled. Afterwards, the only other time Lewis reacts to being shot is when he's hit on his left side, where the heart locket usually is.
• Badass in a Nice Suit: Looks pretty good in his new suit.
• Berserk Button: In the sequel animation "Freaking Out", Shiromori learns the hard way that you really shouldn't try to damage Lewis' heart locket.
• Big Bad Ensemble: His desire for Revenge on Arthur is one of the main plot points, making him one of the main antagonists, the other being Shiromori.
• Black Eyes of Crazy: When Shiromori gets his attention by scattering the purple flower and when he drops Arthur into a spike-pit, he's shown in his human form with black sclera and glowing purple irises.
• Came Back Strong: A more villainous example. While we weren't given a measure of how strong Lewis was when he was a human, it's probably nothing compared to how strong he is as a ghost. However...
• Came Back Wrong: He is also obsessed with revenge against Arthur for killing him, though this is implied to be because he doesn't realize Arthur was not acting entirely on his own will.
• Crazy Jealous Guy: Played painfully justified with Lewis, who was murdered by Arthur and is justifiably angry that he accidentally prevented him from reconciling with Vivi. Unfortunately, he is likely not aware that Arthur was Not Himself when he murdered him.
• Curtains Match the Window: Both when he was alive and now as a ghost, he had purple hair and eyes.
• The Dandy: He is a snazzy dresser in a badass suit. In life, he even favored Awesome Anachronistic Apparel.
• Delinquent Hair: He has a big pink flaming pompadour.
• Dem Bones: Lewis has a floating Skull for a Head and his suit is decorated with rib bones.
• Demonic Possession: Possesses and transforms Rooster's truck in "Freaking Out".
• Doorstop Baby: Though Lewis was older than is normal for this, he still was found by the Peppers on their doorstop, tired and scuffed up.
• Early Installment Character-Design Difference: Downplayed, Lewis' human form has a hook nose and his skin is darker in "Freaking Out" and later music videos.
• Empathic Weapon: It's more a reflection of Lewis' mood, but his heart locket matches whatever mood he feels. When he's determined or feeling love for Vivi, it's a heart of gold. When he is distraught or feeling lost, it's blue and cracked. When Lewis throws Arthur into the pit, it becomes a deep blue-grey and has more cracks on it than it had at any other point in the series. The look on his, err, skull is one of heavy regret. When Arthur holds it, the picture within reverts to one of the entire Mystery Skulls, revealing that Lewis shut the rest of them out after his death and when Lewis sees it he breaks down crying.
• Enhanced Punch: His ghostfire-imbued punch could give Captain Falcon a run for his money.
• Et Tu, Brute?: Justified and Deconstructed. Lewis was killed by his possessed friend, Arthur, and now seeks revenge.
• Expressive Skull: He's usually shown with an angry look on his skull (to the point of sprouting Cross-Popping Veins if sufficiently ticked off), but is capable of expressing other emotions like confusion or surprise through bending his eye sockets. Justified by the fact that he's a spirit, and so doesn't have to conform to physical body limitations.
• Eyes Are Mental: Regardless of whether he's depicted as human or skeletal, always has the same pink-and-black eyes after his death.
• Face–Heel Turn: Before his death, Lewis was a member of the Mystery Skulls, but after he was killed by a possessed Arthur, he now seeks Revenge. At least until The Future where he seems to have finally gotten the full picture of his death and seemingly forgives Arthur.
• Flaming Hair: His hair is made of magenta flames, which becomes more apparent when he goes berserk at the end of Ghost.
• Flaming Skulls: His head is a jaw-less skull with magenta flames for hair.
• Floating Limbs: His ghostly skull, minus lower jaw, is floating over his shoulders with no neck.
• Freudian Excuse: See Face–Heel Turn above.
• Genius Loci: The mansion from "Ghost" was a manifestation of his power — extending into the supernatural cave where he died, as patches of its wallpaper and floor tiling can be seen when Shiromori pays it a visit in "Freaking Out".
• Gentle Giant: At least he used to be when he was alive. Nowadays, he fits more under Evil Is Bigger.
• Ghostly Goals: His seem to be split between wanting revenge on Arthur and wanting to be loved again by Vivi. In "Hellbent", he prioritizes the former... and seems to realize at the very end that he made the wrong call.
• Glamour Failure: As a ghost, can appear as he did in life... but there's always something wrong with his eyes when he does. They appear as either Hidden Eyes, or as black pits with brightly glowing irises.
• Glowing Eyelights of Undeath: He has glowing magenta irises floating in the sockets of his skull.
• Happily Adopted: He was found by the Peppers when on their doorstep as a child, and they raised him as one of the family.
• Heel–Face Turn: In The Future, Lewis follows up on the regret he showed at the end of Hellbent. Not only does he begin destroying his illusory cave to stop Arthur from dying (before Lance's gunshot makes the efforts moot), but during Shiromori's attack, he fights the villainous plant yokai along with the rest of the Mystery Skulls Team. Whether this is a momentary change of heart or a full-fledged return to the team remains to be seen.
• Heel Realization: Hinted at in Hellbent, and then shown in The Future, where Lewis briefly sees Arthur as himself, which stops him from going through with killing him. He also begins to cry when, after Arthur touches the locket, it reveals that it's a photo of the entire group, together.
• He's Back!: After seemingly giving up at the end of Ghost due to being unable to reunite with Vivi, Shiromori messing with his Locket in Freaking Out awakens him, to which he immediately sets his sights on getting revenge on Arthur once again.
• Hidden Eyes: In the flashback showing when he was alive and at the end of "Ghost". However, the picture in his locket switches back and forth in showing his eyes depending on the episode. "Future" seems to imply that this is a result of his campaign of vengeance against Arthur, with the locket switching back and forth quickly after Lewis takes the locket back from Arthur and has given up killing him.
• Huge Guy, Tiny Girl: Lewis is about seven foot and three inches tall compared to the five foot and four inches Vivi.
• If You Kill Him, You Will Be Just Like Him!: As Arthur is falling to his death in the replica cavern, Lewis sees an image of himself in the same situation, and begins to stay his hand before Lance breaks the illusion.
• Impaled with Extreme Prejudice: Lewis died by being pushed off of a cliff onto stalagmites.
• Irony:
  • In life, Lewis' favorite video game was Grim Fandango, a game whose protagonist is a skeletal ghost. Now Lewis is a skeletal ghost as well.
  • On a lesser note, his favorite food involved chocolate covered Bhut Jolokia peppers. Bhut Jolokia peppers are also called Ghost peppers.
  • Less blatant and more based on fan-interpretation but given the way Arthur hides behind Lewis prior to the latter's death, it would appear that Lewis was very protective of the mechanic. Now that he's a ghost, Lewis is trying to murder Arthur for something that wasn't his fault.
• Jacob Marley Apparel: Averted. Between Mysteryben's promo art for the album "One of Us" and a Freeze-Frame Bonus in "Hellbent", it's apparent that the suit is a relatively new look.
• Karmic Death: Not him, but in Hellbent, he attempts to give Arthur one of these by creating a replica of the cavern he died in and dropping Arthur to his death.
• Love Makes You Crazy: Played straight and painfully justified with Lewis, who was murdered by a possessed Arthur and takes the chance to kill him, and is even more enraged when he prevents him and Vivi from reconciling.
• Magic Fire: Lewis, a ghost with fire powers, summons and uses bright pink supernatural fire, which also happens to fit neatly into his Color Motif.
• Magitek: Has demonstrated the ability to tamper with the Mystery Skulls' van, forcing it to a stop, took over a truck after being hit by it, changed the van's radio, and even shorted Arthur's prosthetic arm in the "Hellbent" teaser.
• Memento MacGuffin: The gold locket floating in front of his chest, which contains a photo of him and Vivi. It turns blue and cracks at the end of "Ghost", but repairs and turns gold again when he regains his determination in "Freaking Out". It cracks again, more severely, and turns grey at the end of "Hellbent".
• The Minion Master: He can apparently summon and command the Dead Beats from his locket and control them.
• Misplaced Retribution: He fully intends to hunt down Arthur and kill him, seemingly unaware that his death wasn't Arthur's call.
• Murder Into Malevolence: Is repeatedly stated to have been kind and gentle in life; the introduction to the Peppers went so far as to call him "quite the blessing". Decidedly less so after death.
• My God, What Have I Done?: He seems to have this reaction at the end of "Hellbent", where his heart locket cracks again after he drops Arthur off of the cliff. "Future" follows up on this by showing him visualizing the falling Arthur as himself in the same situation from back when he died, causing him to be unable to go through with it. Later in the video he fully goes through this when he opens his heart locket and sees the real picture inside of it is of the entire Mystery Skulls team together, causing him to fall to his knees crying as he realizes that his tunnel-vision caused him to forget what the entire team minus his girlfriend meant to him.
• Mysterious Past: Lewis ended up on the Pepper's doorstop as a young boy, and no matter how much the Peppers tried, his origins remained a mystery.
• Oh, Crap!: Lewis has a brief moment of shock just before he's run over by Rooster's truck.
• Our Ghosts Are Different: Lewis is a vengeful wraith who is out to kill Arthur for murdering him.
• Personality Powers: He has fire powers and is a vengeful and enraged ghost.
• Pink Girl, Blue Boy: Inverted. Lewis' associated colors are magenta, while Vivi's associated colors are blue.
• Playing with Fire: His main power as a ghost is conjuring magenta flames, which he can use to create explosions.
• Real Men Wear Pink: Lewis' favorite genre of entertainment was Romance and his favorite show was Sailor Moon, with his color motif being neon magenta.
• Reality Warper: Downplayed, Lewis can create and alter objects with his powers to a degree but is only at full power inside one of his constructs. The mansion in Ghost seems to have been his creation, and was able to manipulate reality as well as physics to his whim inside of it. Meanwhile in Freaking Out he gives a makeover to the semi-truck he uses to chase after the others. He even creates a replica of the cavern he died in inside the truck, which is now Bigger on the Inside.
• Resurrected Romance: Lewis holds a candle for Vivi because they were lovers before his death.
• Revenge Myopia: Lewis wants to kill Arthur for killing him, even though Arthur was possessed by a green spirit, which forced him to kill Lewis (although it's unknown if Lewis is aware that Arthur was possessed or not).
• Rose-Haired Sweetie: Lewis was described as a nice person in life. But with his thirst for vengeance and his determination to get to the Mystery Skulls, not so much anymore.
• Shirtless Scene: His human form in "Freaking Out" is completely naked when we first see it.
• Skull for a Head: As a ghost, he has a floating skull for a head with no lower jaw.
• Soul Jar: "Freaking Out" has him come out of his locket, implying that this is where his soul is usually contained.
• The Speechless: Safe to assume as of "The Future", wherein he is the only character in the trio of humans who isn't voiced in some way; the closest thing he gets being a confused grunt after he sees Arthur's expression when he drops him off the cliff. It would also explain why Arthur and Vivi were never able to figure out who he was and what he wanted earlier, and make a lot sense given that he doesn't have a lower jaw.
• Super-Strength: He's insanely strong, given that he decapitates Shiromori — who in turn is strong enough to crack solid stone with a single punch.
• Technicolor Fire: The mystical fire that Lewis uses is magenta in color, fittingly enough.
• Top-Heavy Guy: Lewis, both as a human and a ghost, has a rather muscular torso but skinny legs. His legs were made slightly longer in "Freaking Out", but not by much.
• Tuckerization: He's named after Luis Dubuc, the founder of the real life Mystery Skulls.
• Vengeance Feels Empty: His reaction at the end of "Hellbent" and the beginning of "Future", where his heart locket cracks again and turns dark grey after he drops Arthur off of the cliff. Having realized that what he just did made him no better than Arthur.
• Villain Protagonist: "Ghost" and "Freaking Out" feature him as a major focus; the former song is from his perspective, and the second part of the latter video is devoted mostly to him resolving to find Vivi and get Revenge on Arthur.
• Wanting Is Better Than Having: His heart locket shatters again once he finally gets his revenge against Arthur, suggesting he realized Vengeance Feels Empty.
• We Used to Be Friends: With the rest of the Mystery Skulls, especially Arthur.
• Whole Costume Reference: Lewis wears the black suit and gloves of Johnny in Night of the Living Dead (1968). He also wears a tie (albeit a different-looking one) as well as have a somewhat similar haircut.
• You Can't Kill What's Already Dead: He's seemingly invincible to just about anything; Lance shooting him multiple times with a shotgun — even in the locket — doesn't seem to do anything beyond piss him off. The closest thing to put him down is crossing the Despair Event Horizon after Vivi flees from him at the end of Ghost — and even that doesn't stick, as Shiromori's messing with his locket in Freaking Out is enough to bring him out of it.

???

??? is the green spirit that possessed Arthur's left arm.

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• Amputation Stops Spread: Mystery rips the arm containing it off to stop it. That doesn't prevent it from remaining active, however...
• Badass in a Nice Suit: Based on its updated profile, it certainly looks dressed to kill.
• Big Bad: While previously seeming to be the Greater-Scope Villain, it takes an active role in events at the end of "The Future", where it seemingly succeeds at possessing Mystery.
• Black Eyes of Crazy: When it possesses Arthur, it turns his eye's sclera on the corrupted side of his body black. Inhabiting his severed arm, it's grown a black-scleraed eye on the palm of his hand.
• The Cameo: It shows up briefly in Freaking Out possessing Arthur's severed arm, crawling out of the cave to parts unknown... It comes back at the end of The Future when it grabs hold of Mystery's heart and possesses him.
• The Corruption: It's heavily implied negative emotions make people susceptible to its possession — Arthur's envy of Vivi and Lewis's close relationship allows the spirit to control him, and it's implied the emotional turmoil Mystery undergoes in The Future made it easier or possible for the spirit to possess him.
• Demonic Possession: Did this to Arthur's left arm and to Mystery.
• Evil Laugh: Has one right at when it takes control of Mystery.
• Grand Theft Me: It possessed Arthur and caused him to push Lewis to his death. It returns in the most horrifying way possible: it possesses Mystery after his possible death.
• Greater-Scope Villain The one responsible for possessing Arthur and killing Lewis. However, it has no actual role in the present of the story. Probably. It does, and with Lewis having let go of his hatred, Shiromori being seemingly dead, and Mystery having been left vulnerable, it reveals itself to be the true Big Bad.
• Green-Eyed Monster: Literally — It's green, and it's heavily implied it manages to partially possess Arthur by tapping into his envy of Vivi and Lewis.
• No Name Given: Its profile is only a bunch of question marks. Based on the latest information, it may be "Reverb".
  • Its updated profile on the Character Profiles page, which now has a proper silhouette (with glitchy single-frame flashes of the "hand" form to show it's the same character), just has "HAHAHAHAHAHAHAHA" where its name should be.
• Oh, Crap!: In its cameo at the beginning of "Freaking Out", it flinches and scuttles away in alarm when it spots Shiromori.
• Walking Spoiler: Knowing too much about ??? gives away the big twist that it manages to get its grubby hands on Mystery by the end of "The Future".

Shiromori

♫ Got to get back to the life that I know! ♫

A supernatural being who stops by the cave where the Mystery Skulls had their fateful investigation. She's not interested in that, though— she's after Mystery.

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• Alas, Poor Villain: Her (seeming) death at the end of The Future is portrayed rather sympathetically, particularly in light of Mystery's attempt to spare her — she dies with a look of confusion, sadness and terror on her face, reaching out for Mystery as her body wilts away, and Mystery is clearly left distraught at his failure to help her.
• Amazing Technicolor Population: She has blue skin. It's a Justified Trope given she seems to be a Yokai of sorts.
• Attack Its Weak Point: In The Future, she gets injured enough to expose a vulnerable heart-like organ inside her body. One direct hit from Vivi's bat to knock it out of her body appears to kill her.
• Ax-Crazy: When she catches up to Arthur and Mystery she slams her shears into the windshield of their van very enthusiastically and she reacts with something close to ecstasy when she sees she's drawn Mystery's blood.
• Big Bad Ensemble: She's one of the main supernatural antagonists tailing the Mystery Skulls (Mystery in particular), the other being Lewis. They're definitely not working together, however, and will fight each other if they interfere in each other's plans.
• Black Eyes of Crazy: When she gets particularly worked up, her eyes go black with red pupils.
• Blood Lust:
  • In Hellbent, she manages to slightly nick Mystery with her scissors, and immediately works herself into a frenzy upon seeing the bleeding cut. The same video shows that she is a bonsai turned youkai by being exposed to Mystery's blood. It is not unreasonable to surmise that she is after Mystery because more of his blood would make her even more powerful.
  • In The Future, Mystery bites his own leg to make himself bleed so that Shiromori gets distracted and stops attacking Vivi. It gives Vivi enough time to grab the bat on the ground and strike at Shiromori while she's focused on Mystery's wound.
• Character Death: Vivi succeeds in knocking Shiromori's heart out of her chest, leaving her as a lifeless wooden puppet.
• The Dog Bites Back: She was once an ordinary plant until Mystery turned her into a yokai on a whim, growing into a blue bonsai tree with white leaves. Shiromori lived pleasantly enough afterwards until she was cut down as collateral damage when a monster slayer went after Mystery. It's unknown why she wants to kill Mystery, with her being angry at his apathy getting her chopped down being a possibility, and bloodlust for his blood another.
• The Dreaded: Mystery seems afraid when he realizes she's following him and even the green spirit dwelling in Arthur's severed arm hightails it when she shows up.
• Elemental Rock-Paper-Scissors: Judging by the damage a single punch by Lewis inflicted on her, his fire powers may be particularly effective against her plant-like nature, although she can still regenerate even after being burned to a crisp. She is also revealed to be vulnerable to ice as Vivi's new powers in The Future compromise her Healing Factor by freezing over her wounds so her body cannot grow back over them - it makes sense since most plants die when exposed to extreme cold.
• Fangs Are Evil: In addition to her serrated lips, her teeth are shark-like.
• Fast Tunnelling: Her main form of transportation is burrowing through the ground. She's fast enough to keep up with Lewis' truck in Hellbent.
• Foil: To Lewis, which comes to a head in The Future. Both were motivated by revenge, but their stories end up taking different turns. Lewis ultimately can't bring himself to kill Arthur, but when Shiromori is spared by Mystery and Vivi, she responds by attacking them when their backs are turned, resulting in her landing a fatal blow on Mystery (which she might not have meant to do) and getting her heart knocked out of her body by Vivi.
• Green Thumb: She can summon color-themed flowers tied to specific people. The flowers can then be used to track their counterparts by blowing off their petals. Lewis was also able to use the petals of Vivi's flower to repair his locket, implying that they have some other magical properties.
• Handwraps of Awesome: Probably to keep her hands in good condition when she punches stone hard enough to crack it. She notably loses the handwraps on one arm when it regenerates after it's disintegrated.
• Healing Factor: Regenerated her head and arm after an enraged Lewis punched the former off and burned them to ash. In The Future, however, Vivi's new ice powers appear to disrupt them by freezing her wounds over.
• Hidden Agenda Villain: Hellbent gives some backstory for why she's hunting Mystery, but her exact reasoning is still unclear.
• If I Can't Have You…: She goes ballistic over seeing Mystery working with Vivi, who looks mighty similar to someone she dealt with in the past.
• Irony: She's a living tree, but her weapon is a set of jagged gardening shears.
• I Hate You, Vampire Dad: Mystery created her with his magic blood, but she's now trying to kill him and really, really wants his blood, quickly abandoning her fight with Vivi for a chance to taste it.
• Iron Butt Monkey: She takes quite a bit of abuse, typically from Lewis. In Freaking Out, Lewis punches her head off along with one of her arms. In "Hellbent", in an attempt to stop the Mystery Van, Lewis hurls a fireball at the Mystery Van's tires in an attempt to stop it, which dislodges Shiromori from her position on the van and causes her to comically smack into the road, and then it's heavily implied Lewis' truck runs her over. Later in the same episode, she also takes a baseball bat to the head courtesy of Vivi, hard enough to send her head spinning like a top. If not for that Healing Factor of hers, she'd be dead many times over.
• Know When to Fold 'Em: In Freaking Out, she's willing to challenge Lewis to a fight... until he shows his powers in comparison to her scissors. It is unclear if she fled due to feeling outmatched, or whether she felt the flower that would lead to Mystery would be damaged, losing his trail. The way she looks at the flower just before escaping seems to imply the latter, though.
• Light Is Not Good: Shiromori is associated with white and pink, and does not seem to be a nice lady.
• Living Weapon: Her shears seem to be alive in some capacity, with an eye at their pivot that glares at Mystery when Shiromori grazes his cheek. They even get a Sweat Drop when Shiromori gets thrown into a truck and explodes in Hellbent.
• Meaningful Name: Her name means "white forest" in Japanese, which is appropriate since she is a white-haired tree demon. Additionally, the flashbacks in Hellbent indicate she may have been a literal white forest at some point.
• Mysterious Past: We know little about who she is and why she's chasing Mystery. Hellbent implies that she was a yokai created by Mystery in medieval Japan at some point before the latter was attacked by a female samurai/ninja, but it's still unclear why she hates Mystery and is trying to kill or maim him. The Future seems to imply she craves his blood and wants more of it.
• Mystical White Hair: Hellbent reveals she's a yokai, so certainly not human.
• Plant Person: She has a bonsai tree growing out of her head and her feet are always submerged in the ground like roots. Parts of her body even revert into dirt when damaged badly enough. She also has the power to form flowers out of people's memories of other people or from objects and places psychometrically associated with them. "Hellbent" reveals that she was a plant that Mystery turned into a yokai with his blood.
• Shear Menace: Her weapon of choice is a set of gardening shears with a glaring eye. When she gets serious, she can transform it into an enormous set of jagged hedge shears.
• Slasher Smile: Shiromori is a master of this trope. She's got a rather breathtaking assortment of them and they get successively more deranged the closer she gets to Mystery.
• Super-Strength: She's far stronger and tougher than a human could ever be, being capable of cracking stone with her fist.
• Sympathetic Magic: Her flowers seem connected to who they represent, and in addition to being used for tracking, they have other effects, like Lewis fixing the locket with petals from Vivi's and Arthur reacting when Lewis stomps on his.
• This Is Gonna Suck: She sports an Oh, Crap! expression in Freaking Out when an enraged Lewis bursts out of the cracked locket, setting one of her arms on fire; and in "Hellbent" when she's knocked off the Mystery Skulls' van and into the path of Lewis' semi — which promptly runs her over.
• Tragic Villain: Implied in Hellbent and just about outright confirmed in The Future — beneath the Blood Lust and Ax Craziness, she's just a bitter yokai deeply hurt by her creator's mistreatment of her, still longing for his attention even as she seeks out revenge.
• Uncertain Doom: Vivi knocks her heart out of her body, sending it flying away and killing her, but the heart itself is notably never visibly destroyed, making it possible that she could still come back.
• Ungrateful Bitch: Mystery intervenes on her behalf when Vivi has her on her back and convinces the latter to just leave. What does Shiromori do in response? Why, throw a jealous tantrum and kill him, of course.
• Wanting Is Better Than Having: She spends the entirety of Hellbent seeking to harm Mystery, but when she finally does in The Future she's distraught over his condition, crying and reaching out to him after Vivi knocks out her heart.
• White Hair, Black Heart: Has pure white hair and, unlike Lewis, we haven't seen any redeeming reason for what she does. We have some knowledge of her past with Mystery, but it's still unclear why she wants to kill him. Her reaction after grievously wounding Mystery implies her heart may not be as black as we thought.

Other Characters

Uncle Lance

♫ Don't know what else to do. ♫

Arthur's uncle, and owner and head mechanic at "Kingsmen Mechanics". Makes his animated debut in "Hellbent".

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• Big Ol' Eyebrows: They're even bigger than his eyes.
• The Engineer: He's a mechanic who fixes cars and at least puts up with his nephew's Gadgeteer Genius ways and allows him workspace for his inventions even if he doesn't really understand.
• Family Theme Naming: Due to the rest of his family's Arthurian Legend theming, he's named after Sir Lancelot, one of King Arthur's greatest companions.
• Hereditary Hairstyle: Arthur's not the first member of the family with hair that looks like his.
• Old Shame: invokedDon't bring up the fact that he used to be a professional wrestler.
• Oh, Crap!: He's obviously panicked when repeatedly shooting Lewis has no effect on him.
• Papa Wolf: Once he sees his nephew's van crashed out the front of his auto shop and an obviously supernatural truck apparently being the cause, he immediately grabs his shotgun and runs out to do some ghostbusting. As implied in Hellbent's stinger and shown in The Future, he puts it use by shooting away Lewis' locket, dispelling his magic and saving Arthur.
• Strong Family Resemblance: He may be considerably shorter and rounder than his nephew but their hair is near identical excepting Lance's superior facial hair, he and his nephew also seem have the same fashion sense.
• Top-Heavy Guy: He has proportions that are almost Dwarven, between his extremely short, skinny legs but incredibly robust torso and arms, to the point he bears a passing resemblance to Salvador.

Galaham

Arthur's pet hamster.

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• Family Theme Naming: Named after Sir Galahad of Arthurian Legend, matching his namesake's status as Sir Lancelot's child with his role as the mascot of Lance's shop.
• Only Known by Their Nickname: While Galahad is his "legal" name, he is usually called "Galaham".
• Shout-Out: His design and nickname seem to be a direct homage to Hamtaro, but his name is based on Sir Galahad of Arthurian Legend.
• Team Pet: Of Kingsmen Mechanics.

Mr. & Mrs. Pepper

♫ Afraid of losing you. ♫

Owners and chefs of the "Pepper Paradiso" restaurant, and Lewis' adoptive parents.

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Tropes applying to both

• Big Ol' Eyebrows: They both have very prominent eyebrows, Mrs. Pepper's being black and tapered while Mr. Pepper's are blonde and curled in the middle.
• Brooding Boy, Gentle Girl: Gender-Reversed. Mrs. Pepper seems to be the Brooding Girl to Mr. Pepper's Gentle Boy.
• The Cameo: They and their children (including Lewis) can be seen in the picture Arthur has set as his computer background in "Freaking Out".
• Curtains Match the Windows: Mr. Pepper's eyes are pink like the sides of his hair, and Mrs. Pepper's eyes are dark pink like her hair.
• Prophetic Names: Their surname is Pepper. Their restaurant specializes in spicy food. Yeah.
• Tiny Guy, Huge Girl: Mrs. Pepper is noticeably taller than her husband.
• Unnamed Parent: Only referred to as "Mr. and Mrs. Pepper" by Mystery Ben.

Tropes applying to Mrs. Pepper

• Astonishingly Appropriate Appearance: The head chef of a restaurant that specializes in extremely spicy food, and her hair is shaped like a chili pepper, complete with a darker lock sticking up for a stem.
• Statuesque Stunner: Mrs. Pepper appears to be taller than Arthur on this character lineup.

Tropes applying to Mr. Pepper

• Dude Looks Like a Lady: Between his pink/white hair and slender frame, it's unlikely you'd notice he's Lewis' adoptive father at first glance.
• Older Than They Look: If you didn't know he was their father, Mr. Pepper wouldn't look out of place as an older brother.
• Rose-Haired Sweetie: If Mr. Pepper's reaction to Arthur's burning mouth is any indication, he and Paprika are the biggest sweethearts in the Pepper family.

Paprika, Cayenne & Belle Pepper

Lewis' little sisters, the biological children of Mr. and Mrs. Pepper.

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Tropes applying to all three

• The Cameo: They can be seen alongside their brother and parents in the picture Arthur has set as his computer background in "Freaking Out". Paprika is sitting on Lewis' shoulder, Belle is giving the camera a cheerful V sign in the foreground and Cayenne is snickering under the table.
• Curtains Match the Windows: Belle and Paprika each have eyes that match their pink hair, Cayenne's eyes have yet to be seen by likely fit the pattern.
• Family Theme Naming: Their names all fit within a food theme. Specifically all of them are named after types of peppers.

Tropes applying to Belle

• Boyish Short Hair: Her hair is cut very similarly to her father's and she seems to be an cheerful active tomboyish kid.
• Pointless Band-Aid: Belle has a band-aid on the bridge of her nose, her other band-aids seem to imply she's a pretty active kid that ends up getting scrapes often but the one on her nose just seems to be shorthand for a hyperactive personality.

Tropes applying to Cayenne

• Eyes Out of Sight: Her eyes are entirely hidden by her bangs even when she's wearing a headband.
• The Prankster: She put hot sauce in Arthur's milkshake and then hid under the table to laugh at his misfortune.

The Yukinos

Vivi's family, consisting of her parents and her paternal grandmother.

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Tropes applying to all of them

• Color-Coded Characters: The Yukino family has a blue theme, though Vivi's mother, who married in, has a prominently yellow theme with just a few blue accents.

Tropes applying to Grandma Yukino

• Miniature Senior Citizens: Vivi's grandmother doesn't even come up to her son's hips and just barely reaches her daughter-in-law's waist.

Tropes applying to Mr. Yukino

• Savvy Guy, Energetic Girl: He appears to have a no-nonsense attitude with little patience for frivolity and silliness, a stark contrast to his wife's very sunny disposition.

Tropes applying to Mrs. Yukino

• Savvy Guy, Energetic Girl: She appears to be very energetic and have a sunny disposition, a stark contrast to her husband's no-nonsense attitude.

Duet

They can see me, and where I'm goin'.

Vivi's boss at the bookstore "Tomb Tomes"; not even she knows much about the mysterious Duet outside of the fact that they are the owner of the bookstore and are a surprisingly enthusiastic conversationalist despite their deadpan delivery.

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• Ambiguous Gender: No pronouns are used in Duet's character sheet, and they've got a somewhat androgynous appearance. It was later revealed that they were nonbinary.
• Duality Motif: Their two-tone hair, asymmetrical clothes, the fact that they are described as delivering all of their dialog deadpan while being an enthusiastic conversationalist and their very name all lend a duality to Duet.
• Exhausted Eye Bags: Visible under their right eye.
• Eye-Obscuring Hat: Just the left eye though.
• Fashionable Asymmetry: Their hat drapes over only the left side of their face and their caplet is longer on the left side than it is on the right.
• Nightmare Fetishist: It's not outright stated but they own a bookstore called "Tomb Tomes" and both of their employees are also nightmare fetishists, one of whom is a paranormal investigator in her time off.
• Too Many Belts: Downplayed. They wear two unnecessary belts.
• Unusual Eyebrows: Their single visible eyebrow is hot pink and bright yellow and appears to split off into a lazy v shape from it's origin at the top of their nose.

Chloe

Vivi's co-worker at "Tomb Tomes", and completely obsessed with obscure manga.

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• Ambiguously Human: Self-explanatory. Just look at her.
• Face Framed in Shadow: Her hood keeps her entire face outside of her glasses shadowed.
• Geek: Usually shows up for work in full cosplay gear.
• Mercury's Wings: On the hood of her green outfit.
• Nerd Glasses: They shine even when the rest of her face is in shadows.
• Nightmare Fetishist: Wants to join Vivi's paranormal investigations to get an undead boyfriend.
• Shadowed Face, Glowing Eyes: Invoked and exaggerated; Chloe goes to work in full cosplay, which involves a hood that obscures her face, leaving her glasses, mouth, and even her freckles glowing from the darkness.
• The Team Wannabe: Wants to join the Mystery Skulls, but Vivi refuses to let her out of concern that she's not old enough.

The Dead-Beats

Ghostly minions that follow Lewis around.

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• Jagged Mouth: When they drop their cutesy guise, most of them sport jagged mouths.
• Perpetual Frowner: There is always one smaller Dead-Beat that looks sadder and more unsure than the rest of them. It's implied this one represents Lewis' buried feelings of uncertainty about taking revenge on Arthur.
• Slasher Smile: Most of them sport malevolent grins.
• Supernatural Gold Eyes: All of them have this feature, which fits them as they're ghost-shaped minions of one greater ghost.

Mushi

All I need is you.

A mysterious swordswoman who appears to be an ancestor of Vivi's.

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• Action Girl: She is a skilled swordswoman who has fought and defeated both Mystery and Shiromori during her lifetime.
• Ambiguous Situation: How exactly she connects to Mystery and Shiromori is still a bit unclear. The flashbacks in Hellbent show her being captured by and then battling Mystery in his Kitsune form. But when Shiromori briefly mistakes Vivi for her, the Mushi she sees seems to be protecting Mystery, with it being unclear if this is an actual memory or simply Shiromori mistaking Vivi for Mushi.
• An Ice Person: Her katana is shown to have a freezing chill to it, and when she lends her power to Vivi, it's shown that said chill is very effective at harming supernatural beings like Shiromori.
• Arch-Enemy: To Shiromori and Mystery when the latter was still a malevolent Kitsune. Seeing as Mystery is currently accompanying her descendant, it doesn't look like he's holding a grudge. Shiromori on the other hand...
• Cool Scars: She has a small one on the side of her right cheek and one on her right lower arm.
• Cool Sword: Her katana has snowflakes on its blade, as well as a snowflake-shaped Tsuba, and is enchanted to be "cold enough to slice through even the most hot-headed demon."
• Death Glare: It's practically her only expression in the few flashbacks we see her in.
• Identical Grandson: Apart from the longer hair she looks almost exactly like Vivi. The resemblance is close enough for Shiromori to think that Vivi is Mushi when she sees the former for the first time.
• Scarf of Asskicking: She wears a long, blue scarf and is a badass Action Girl who's not afraid to duke it out with a powerful Kitsune.
• Spirit Advisor: She appears to Vivi in a vision in The Future, seemingly helping her unlock her ice powers. Her image also overlaps with Vivi's several times during the fight against Shiromori, implying she is actually possessing Vivi or at least lending her a bit of her powers as well.