The characters from ''Manga/UndertakerRiddle'' include:
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!! Hayato Sakura
->Voiced by: Creator/TakahiroSakurai (Drama CD)

A high school student, haunted by ghosts. He met Riddle and, at first, declined the offer to be an undertaker, but in the end, he had to agree in order to save his life from an evil spirit who already made him lose half of his soul. To get a chance to get it back, Hayato must become an excellent undertaker to have an audience with Riddle's superiors and ask for his soul back.

* AllLovingHero: A genuinely good kid who cares very much about others' lives. [[spoiler:It even becomes plot-relevant in the final volume, since this aspect of his personality is what made Riddle grow fond of him in the first place]].
* CurtainsMatchTheWindows
* [[spoiler:EtTuBrute]]: [[spoiler:Is incredibly shocked when Riddle lethally impaled him to take Sigurd's soul out of him]]. However, he recovers pretty quickly and [[spoiler:catches on to the fact that Riddle has a different plan]].
* [[spoiler:HealingHands]]: [[spoiler:Thanks to the regenerative powers of the Twilight Key, he can quickly close injuries.]]
* [[spoiler:HellishPupils]]: [[spoiler:When his SuperpoweredEvilSide gets activated.]]
* IJustWantToBeNormal
* ISeeDeadPeople
* LikeAnOldMarriedCouple: With Riddle.
* MacGuffinSuperPerson: [[spoiler:He holds the Twilight Key, an immense power that can create and destroy worlds.]]
* PowerTattoo: Received one of these after the king partially activated his powers. Its function is mostly to show how many [[RuleOfThree of the three times]] are left to Hayato to use his powers.
* [[spoiler:SuperpoweredEvilSide]]
** [[spoiler:EnemyWithin]]: [[spoiler:Who turned out to be Sigurd.]]
* SoBeautifulItsACurse: Ghost girls are the ones who mostly attack him because they're in love with his beauty. Even Riddle lampshaded that Hayato's beauty should be considered a sin.
* [[spoiler:UnexpectedSuccessor]]: [[spoiler: As holder of the Twilight Key, he qualifies to be Faust's successor to protect The Catacomb of Souls.]]

!! Undertaker Riddle
->Voiced by: Creator/KojiYusa (Drama CD)

In charge of making ghosts go to the afterlife and holding proper funerals to exorcise evil spirits, Riddle bonds Hayato to him, giving him half of his soul. Loves to appear out of nowhere, mess with Hayato's head and act kinda childlike but he's very good at his job. Most about him and his past is unknown.

* BishieSparkle
* {{Catchphrase}}: "My condolences".
* TheChampion: First to Sigurd and eventually to Hayato. Because of the nature of Undertaker duos this series is full of Champions, but Riddle is probably the straightest example, since [[spoiler:his devotion is limited to these two and he openly admits to not caring about anyone else]].
* FirstNameBasis: With Hayato, since the very beginning.
* GentlemanSnarker
* GrimReaper: One half of every Undertaker duo is technically this, but he seems to play it up more than any of the others.
* KnightInSourArmor: He considers caring for others to be a weakness and that seeing things coldly and professionally is better than to have your heart exposed to betrayal.
** [[spoiler:HeroicSafeMode]]: [[spoiler:Since he was forced to kill Sigurd, he put himself in one of these to cope with the pain.]]
* LikeAnOldMarriedCouple: With Hayato.
%%* LongHairedPrettyBoy
* [[spoiler:TheManBehindTheMan]]: [[spoiler:To Roen]].
* MeaningfulName: Remains a mystery to both Hayato and the audience almost until the very end. The final volume adds a different layer of meaning to his name.
* MyMasterRightOrWrong: [[spoiler:He never stopped having UndyingLoyalty towards Sigurd and was protecting Hayato as Sigurd was within him.]]
* NoSenseOfPersonalSpace: Especially around Hayato.
* NightmareFetishist: He's a cheerful person who loves to mess with people (especially Hayato), but as the GrimReaper that he is, he can see beauty in things normal people would find horrible.
** PerkyGoth
* TricksterArchetype

!! Catacomb of Souls
!!! Secretary Brad
One of Riddle's superiors. First seen testing Hayato to see if he's suitable to be a proper undertaker. Has a dislike for humans and human stuff.

* BadassBureaucrat: He's secretary to the King of the Catacombs, after all.
* BadassInANiceSuit
* ControlFreak: So much that it's scary.
* HeadbuttingHeroes: With Riddle.
* IdiotHair: He's not at all stupid himself, though, and the hair doesn't seem to represent anything else, either.
* ImprobableWeaponUser: He uses fountain pens, fricking fountain pens.
* {{Jerkass}}: Towards Hayato. At first.
* PunyEarthling: Dislikes humans and everything that remotely smells like them.
* TheStoic
* StoicSpectacles
** FourEyesZeroSoul: Hayato's first impression of him, whereupon he gets the nickname "Demon Four-Eyes." It's subverted later on, but Hayato continues to call him this in an AffectionateNickname sort of way.
** ScaryShinyGlasses
* UndyingLoyalty: He's very loyal to Faust.
* {{Workaholic}}

!!! Faust
The king of the afterlife, who judges if the souls should go to heaven or hell. Interested in Hayato since Riddle did a contract with him, being just a human. She also holds a Twilight Key.

* BuxomBeautyStandard: Has a big chest and Hayato finds her to be beautiful.
* TheChainsOfCommanding: Sometimes she must have made not-so-good decisions.
* CoolBigSis: Acts this way towards Hayato.
* TheDreaded: With just a smile, she can intimidate a room full of badasses.
* GorgeousPeriodDress
* HairOfGoldHeartOfGold: She's TheHighQueen of the afterlife, fair, kind and beautiful.
* ImpossiblyLowNeckline: Her fancy dresses are designed to show so much cleavage that one wonders how she doesn't have a WardrobeMalfunction.
* GenderBlenderName: Is actually a woman, despite being named "Faust."
* OjouRinglets
* RoyalsWhoActuallyDoSomething: She forced open the locked gate of hell!
* SheIsTheKing
* StatuesqueStunner: Faust is 1.86m (6.1 feet).

!!! Julian and Chelle
An undertaker sibling team who are looking for Hayato's missing soul.

* ActionGirl: Julian, and how.
* BerserkButton: Don't confuse Julian with a man! She's a woman and proud of it!
* TheChampion: Julian to Chelle, being the physically stronger one.
* TheFakeCutie: Chelle. She, at first, looks like a sweet, adorable girl...later she talks about cutting up Hayato to see where he's hiding the Twilight Key, in a very creepy way.
* GenderBlenderName: Julian is actually a woman.
* HotBlooded: Julian.
* ImportantHaircut: Julian, to escape from an evil spirit, had to let her hair get cut.
* KillItWithWater: Instead of normal burials, they perform water burials.
* [[KnightTemplarBigBrother Knight Templar Big Sister]]: Julian threatens to behead Dante whenever he approaches Chelle too blatantly.
* LadyLooksLikeADude: Julian.
* OlderThanTheyLook: Chelle isn't actually underage, despite looking like a 12-year-old.
* SamusIsAGirl: Julian is actually Chelle's older ''sister''.
* SiblingTeam

!!! Ansem and Luka
Another team of undertakers, also looking for Hayato's soul.

* AdorablyPrecociousChild: Luka.
* BadassAndChildDuo
* BigBrotherMentor: Hayato's first impression of Ansem. Also he plays the role for Luka.
* BrattyHalfPint: Luka.
* TheChampion: Ansem to Luka.
* [[spoiler:DrivenToSuicide]]: [[spoiler:Luka was a child violinist in Vienna, but his parents were killed by a thief for his collection of violins. Thinking it was his fault, he hung himself.]]
* ElegantClassicalMusician: Luka used to be a famous child violinist when he was alive and still is as an undertaker.
* GentleGiant: Ansem is 1.89m (6.2 feet) and is the only NiceGuy within the undertakers.
* ImplausibleFencingPowers: Ansem.
* LetsGetDangerous: Ansem, in chapter 37.
* LivingEmotionalCrutch: Ansem to Luka.
* MagicMusic: Luka uses his violin music to perform musical burials.
* NiceGuy: Ansem seems to be the only nice undertaker.
* {{Sleepyhead}}: Luka is often seen yawning.
* TallDarkAndHandsome: Ansem.

!!! Dante and Hiren
Another team of undertakers.

* BloodKnight: Dante.
* ChainedByFashion: Dante.
* TheChampion: Hiren to Dante, so much. The other undertakers are also very devoted to their partners, but Hiren takes it to a whole new level.
* CurtainsMatchTheWindow: For both of them.
* DarkAndTroubledPast
** Dante: [[spoiler:He was betrayed by his mafia family, mostly his own brother.]]
** Hiren: [[spoiler:He became a member of the Chinese mafia at a very young age. Took TrainingFromHell, killed people and more, all to protect his adoptive father who, in the end, betrayed him and told him he was not his son.]]
* DevotedToYou: Hiren to Dante.
* {{Ephebophile}}: Dante prefers cute girls over busty, mature women like Faust; if they are tomboys, all the better, and was disappointed Hayato turned out to be a guy.
* ExtremeDoormat: Hiren
* FieryRedhead: Dante
* HappinessInSlavery: Unlike most of the other undertaker duos, their relationship is very unequal, with Dante calling Hiren "my dog" and Hiren always using respectful honorifics when addressing Dante. Still, they're both satisfied with the way things are, with Hiren happily referring to ''himself'' as Dante's slave/servant/dog.
* HotBlooded: Dante.
* HyperspaceArsenal
* JerkWithAHeartOfGold: Dante.
* KillItWithFire: Instead of a normal funeral, Dante performs cremations.
* LetsGetDangerous: Hiren, especially when Dante's in danger. Hard to believe this is the same guy who always cringes, stammers, and follows Dante around like a lost puppy.
* MessyHair: Hiren.
* MoralityPet: Hiren to Dante.
* NervousWreck: Sometimes painfully so.
* NothingUpMySleeve: Hiren has hidden knives in his sleeves.
* ProneToTears: Hiren. Hayato feels that dealing with him is like dealing with a very emotional child.
* RedEyesTakeWarning: He can be very aggressive and violent, though he's really a JerkWithAHeartOfGold.
* RedOniBlueOni: Dante is the red, Hiren is the blue.
* ShrinkingViolet
* SmokingIsCool: Dante.
* TallDarkAndHandsome: Hiren, though it's only noticeable when he's in Badass mode.

!! The Arcana
!!! Noir
An Evil spirit who's looking for Hayato [[spoiler:as he's the Twilight Key]] who's wanted by his master.

* BadassInANiceSuit
* ChainedByFashion
* GunsAkimbo
* LightIsNotGood: Like most of the villains in this series, he wears white.
* StarterVillain: He's the first evil spirit Riddle is not possible to exorcise entirely and the one that gives Hayato the motivation to be a better undertaker.
* UndyingLoyalty: Refused to say who his master was, even though caught in Riddle's coffin.
* [[spoiler:YouHaveOutlivedYourUsefulness[=/=]YouHaveFailedMe]]: [[spoiler:Was killed for Eve since he failed in getting Hayato.]]

!!! Eve
An evil spirit [[spoiler:that used to be an undertaker]] who's a member of The Arcana under the position of the 7th arcana.

* BreakTheHaughty: Her battle against Ansem. [[spoiler:He gives her a TheReasonYouSuckSpeech about how her rebellion against Faust was what drove her former contractor to suicide, instead of accepting that Faust's punishment on him was fair and said goodbye for his sake.]]
* CuteAndPsycho
* DistinguishingMark: A roman 7 (VII) on her left arm.
* ElegantGothicLolita
* [[spoiler:FaceHeelTurn]]: [[spoiler:She used to be an undertaker but defied the king and was turned into an evil spirit as punishment.]]
* GirlishPigtails
* IOweYouMyLife: Towards Messiah.
* KnightOfCerebus: The St. Paulo's murders were plotted by her and she revealed the BigBad's name and motives to the heroes.
* LightIsNotGood
* LittleMissBadass
* MoreThanMindControl: [[spoiler:Lied to Nemuro about being an "fallen angel" that will turn him into a demon; not to mention Nemuro loved her with MadLove.]]
* NeverMyFault: [[spoiler:Still doesn't accept she was the one that drove her former contractor to suicide and still blames Faust for it.]]
* TheResenter: [[spoiler:She resents Faust for taking her out of the Catacomb.]]
** [[spoiler:To be specific, Eve blames Faust for punishing her former contractor for freeing his mother's evil spirit and him later committing suicide.]]

!!! Roen (Messiah)
The first Arcana.

* BadassInANiceSuit
** BadassLongcoat
* BigDamnHeroes: Villain version. He showed up to save an almost-defeated Eve.
* DarkMessiah: He wants to bring BackFromTheDead to all the dead souls, at the cost of the living's lifes.
* [[spoiler:TheDragon]]: [[spoiler:To Riddle]].
* LightIsNotGood
* [[MeaningfulName Meaningful Nickname]]: "Messiah" means "Saviour" and he's considered this to all of the Arcana's spirits.
* TallDarkAndHandsome

!!! [[spoiler:Dio]]
[[spoiler:Dante's little brother, who betrayed and killed him, as a member of the mafia family]] and the fourth evil spirit of The Arcana.

* BadassInANiceSuit
* [[spoiler:CainAndAbel]]: [[spoiler:The Cain to Dante's Abel]].
* ChainedByFashion
* CurtainsMatchTheWindow
* [[spoiler:DiedHappilyEverAfter]]: [[spoiler:His brother apologized to him for being a bad brother and was able to make peace between each other before Dante performed the funeral.]]
* DistinguishingMark: A roman 4 (IV) on his chest.
* [[spoiler:{{Patricide}}]]: [[spoiler:He killed his father for dishonouring the family.]]
* PlayingWithFire
* PrettyInMink: His jacket has mink on the collar.
* RedOniBlueOni: [[spoiler:The Blue to his brother's Red]].
* [[spoiler:SonOfAWhore]]: [[spoiler:He's the son of his father's Neapolitan lover and was really in despair since his family only accepted pure-blooded Sicilians in their mafia.]]
* [[spoiler:StrongFamilyResemblance]]: [[spoiler:With his brother Dante]].
* TechnicolorFire: Uses blue flames.

!! Humans
!!! Naoya Sakura
Hayato's little brother.

* [[AloofBigBrother Aloof Little Brohter]]: Hayato and him clash sometimes, [[AwLookTheyReallyDoLoveEachOther but they care for the other in their own ways.]]
* BigLittleBrother: He's 8cm taller than Hayato, studies harder than Hayato, is more organized than Hayato...you get the idea.
%%* {{Bookworm}}
* DistressedDude: He was taken hostage by an evil spirit with his soul at risk.
* ForgetsToEat: and sleep. He almost exhausted himself studying.

!!! Nemuro
A student from St. Paulo academy, where Riddle and Hayato go to investigate a series of murders. Since the killer is targeting blond students, he's a potential victim.

* TheAce: Recognized for his top grades and leadership skills.
** [[spoiler:BrokenAce]]
* [[spoiler:BeneathTheMask]]: [[spoiler:Under his good, top student facade, he's a satan worshipper.]]
* DudeLooksLikeALady
* [[spoiler:EvilAllAlong]]: [[spoiler:He's the real murderer of St. Paulo's academy in order to bring Eve.]]
* HairOfGold: A very nice and polite boy... [[spoiler:Or so it seems]].
* [[spoiler:KarmicDeath]]: [[spoiler:His beloved Eve kills him as the last sacrifice.]]
* LongHairedPrettyBoy
* [[spoiler:MadLove]]: [[spoiler:He killed students for his beloved "fallen angel" Eve.]]
* StudentCouncilPresident

!!! Professor Kurotou
A professor of St. Paulo and Riddle and Hayato's suspect.

* TheAtoner: [[spoiler:He will stop punishing his students and stop living in his traditionalism to atone pushing Nemuro deeper in his satanic worship]].
%%* FourEyesZeroSoul: Nemuro's view of him.
* RedHerring: [[spoiler:He wasn't the murderer after all but the last victim. Nemuro actually planted the doubts in Hayato's mind about Kurotou to divert any suspicion from himself and draw him to his trap.]]
%%* SharpDressedMan
%%* SternTeacher
%%* SadisticTeacher: Nemuro's view of him.
%%* StoicSpectacles
* TallDarkAndHandsome: Very tall. Hayato calculated more or less 1.90m.
* WhipOfDominance: He's a creepy SadisticTeacher who uses a whip to punish students, and often targets the weakest ones. Since it's a Catholic boarding school, it's justifiable.
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