Trilby, aka the GuideThe main character of the franchise, a Gentleman Thief turned paranormal investigator.
- Action Survivor: Gets so good at this it basically becomes his job.
- Badass Normal: Capable of taking on magic supernatural entities with just his wits and enough strength to yank the occasional rug and kick the occasional face.
- Cloning Blues: None of his various clones fare nearly so well as the original.
- Gentleman Snarker: Much of his dialogue is dry English wit.
- Gentleman Thief: Trilby prefers to label himself as such, and always fends off accusations that he is a simple burglar by pointing out that he only steals from the rich.
- Known Only By Their Nick Name: He prefers not to let people know his real name - although Word of God is that he shares a birth name with Malcolm Somerset.
- Manipulative Bastard: Makes a habit of it. Explicitly stated in Trilby and the Ghost, where he's outright called a devious bastard after his well-meaning but unkind way of dealing with a ghost. He admits that's why they keep him around.
- Master of Unlocking: In 6 Days.
- Occult Detective: Becomes one as a part of a rehabilitation program.
- Person with the Clothing: He named himself after his hat.
- Retired Outlaw: As of Notes.
- Sharp-Dressed Man: Including Nice Hat and Waistcoat of Style. Becomes Awesome Anachronistic Apparel in the future-set 6 Days.
- Stiff Upper Lip: He tries very hard to appear unflappable in public, even though we see that privately he is very affected by his experiences.
- Unfazed Everyman: He's astonishingly quick to accept the existence of ghosts, paranormal investigation agencies and parallel universes, although the trauma of being possessed and nearly killed by the Defoe Wraith does appear to give him a mild form of PTSD. His clones are, if anything, even more unfazed by their own existence as clones, and one of them remains able to hold an eloquent conversation while inside Chzo.
Dr. John Somerset, aka Malcolm Somerset, aka the CaretakerA psychologist on the Mephistopheles, later revealed to be a fraud who stole the identity of his own father, who tangles with the DeFoe wraith and later kills himself in prison to become the Caretaker of destiny.
- Action Survivor: Like the other two protagonists, he survives an encounter with John DeFoe without any real combat skills.
- Ascend to a Higher Plane of Existence: Becomes the immortal Caretaker in death.
- Self-Made Orphan: Killed his father to steal his identity.
- Trickster Mentor: To Theo and the final Trilby clone.
- You Can't Fight Fate: Comes to believe this after becoming the Caretaker. This is caused by his gaining the ability to see all of time at once following his suicide.
Theo DaCabe aka the New PrinceA council building inspector and all-around average joe, the plot of 6 Days a Sacrifice kicks off when Theo is sent to inspect the Optimology building for signs of illegal expansion. Pushed down an elevator shaft and into a secret underground facility by a member of the cult for which Optimology is a front (the masochistic and Chzo-worshipping Order of Blessed Agonies), Theo, badly injured but alive, struggles to survive the horrors contained within. At the end of the game, Theo, now having endured all of the Blessed Agonies, is dragged through a portal to the World of Magick, and, transformed into the New Prince by Chzo, kills Cabadath and takes his place by Chzo's side.
- Action Survivor: Especially so in his case, as he has no experience with any kind of violence or dangerous situations whatsoever.
- Fourth Date Marriage: after knowing Janine for all of four days - most of which he spent out doing fetch-quests while she hid in her room - he finds himself sleeping with her for comfort and ends up emotionally relying on her so much that losing her puts him through the Blessed Agony of the Soul.
- Heroic B.S.O.D.: Has one of these after the death of Janine. It also counts as the Blessed Agony of the Soul.
- Meaningful Name: Theo's name, when rearranged, is very similar phonetically to Cabadath, hinting at his eventual fate.
- The Everyman: Is the most normal out of the 3 protagonists in the series, having no special skills to speak of and having a relatively uninteresting life. That is, until he becomes the New Prince.
- The Woobie: He did nothing to deserve the horrors heaped on him, yet easily goes through the most traumatic experiences of any of the three protagonists. This is what makes him a more desirable servant to Chzo than Cabadath, as he has been through the Blessed Agonies and thus is "of [Chzo's] flesh."
Chzo, aka the KingThe titular entity of the Mythos, originally an ordinary Pain Elemental in the Ethereal Realm, who consumed all of his brethren and became a fully-fledged Eldritch Abomination.
- Almighty Idiot: Theorised to be a "fattened pig" acting on basic instinct but backed up by the power and magic of a god.
- Big Bad
- The Chessmaster: Albeit possibly by instinct rather than intent.
- Eldritch Abomination
- I'm a Humanitarian: how he ends up being Last of His Kind
- Last of His Kind
- Physical God
- Pure Magic Being: As a pain elemental.
Originally a druid in the year 55 BCE, Cabadath was dragged into the World of Magick by Chzo after a failed attempt to summon and bind it in order to defeat an invading Roman army. Turned into an immortal Lich by Chzo, and deformed after years of horrific torture, Cabadath eventually broke down and swore himself into Chzo's service, and now carries out his master's will in the World of Technology. That is, until Chzo attempts to replace him...
- Absurdly Sharp Blade: The staff he wields. Said staff is similar to a four-bladed scythe, however the sharp part of the blades is on the outside rather than the inside. As a result, the staff is much less efficient at killing, causing incredible amounts of pain in the process...which is a perfect fit for the right hand of a god who feeds on pain.
- The Blank: Didn't start out as one, but was deformed as such by Chzo's torture.
- Break the Haughty: What Chzo intended when it turned Cabadath into the Tall Man, as punishment for attempting to bind Chzo to his will. Whether it succeeded or not is debatable, as while he became a Dragon with an Agenda and actively opposed Chzo's goals, he claims that it was out of loyalty and a desire to continue serving it. It's unclear whether he's telling the truth, or if he's just lying to try to save himself and is really just afraid of a Fate Worse Than Death.
- The Dragon: To Chzo.
- Dragon with an Agenda: Becomes desperate to remain with Chzo, even if that means sabotaging Chzo's actions.
- Dressed to Kill: Wears a nice suit with a Badass Longcoat and Scarf of Asskicking while painfully murdering people.
- The Heavy: Takes over from John DeFoe for the duration of Trilby's Notes and makes an effort to share the role in 6 Days.
- Humanoid Abomination: Post-transformation.
- Mercy Kill: When Chzo reached into the Realm of Technology and took Cabadath, Cabadath begged his friend Galdn to kill him. Galdn was terrified and ran, and Cabadath ended up in immortal slavery to Chzo.
- Neck Snap: Uses these to kill the Trilby clones near the end of 6 Days A Sacrifice.
- Our Liches Are Different: He isn't any sort of necromancer, but was made a Lich involuntarily by Chzo.
- Soul Jar: His tree.
- Super Strength: Frequently tears people open with his bare hands.
- Undying Loyalty: Towards Chzo. Either this, or the fear of a Fate Worse Than Death, is what motivates him to try and prevent Chzo from replacing him.
The DeFoe Wraith, aka John DeFoe, aka the Welder, aka the BridgeAn abused feral child, turned into a serial-killing wraith by the Tall Man.
- Abusive Parents: His father kept him locked in a basement until he went insane.
- The Brute: The least intelligent and most violent of the villains.
- Cool Mask: A (somewhat anachronistic) welder's mask forms part of his costume.
- Demonic Possession: He possesses people in order to kill, his old body being rotted away to bones by now.
- Expy: Of Jason Voorhees. Mask. Machete. Menacing stroll. Lack of dialogue. Child abuse backstory. Associated with significant date. Keeps killing people even after his death.
- Genius Loci: His mind is trapped in the ruins of his house.
- The Heavy: The most commonly-recurring villain in the series and the most direct threat in three out of four games.
- Iconic Outfit: A welder's mask, leather apron and machete are considered to be the artifacts of John DeFoe, and are an instant identifier of anything related to him.
- Meaningful Name: Possibly unintentional, but "John DeFoe" is very similar to "John Doe", the name used as a placeholder for unidentified individuals or corpses. Given his status as both a wraith and The Nameless, this is rather appropriate.
- Menacing Stroll: How he moves at all times.
- The Nameless: Was never given a name in life, due to being disowned and locked in a basement on the day he was born. As such, the different characters come up with various means of identifying him, the most frequently used being Trilby's "John DeFoe".
- Offscreen Teleportation
- The Quiet One: Rarely says anything (unless you count the recurring phrase "father why").
- Soul Jar: The wooden idol.
- Super Strength: Enough to hack people apart and break necks with extreme ease.
- Tragic Monster: He only kills because he's severely mentally ill and urged to violence by supernatural forces beyond his control.
- Weapon of Choice: A machete.
The New Prince, aka the Man of Purity, aka Theo DaCabeAnother servant of Chzo, who came into being following the events of 6 Days a Sacrifice. Is actually Theo DaCabe, transformed into Chzo's new Dragon and having pulled a Klingon Promotion on a powerless Cabadath on Chzo's orders.
- And Then John Was a Zombie: Poor, poor Theo...
- Cool Mask: Similar to that worn by John DeFoe, though the eye slit is vertical rather than horizontal, and the mask encloses his entire head. It would be impossible for it to be used effectively by anyone human - conveniently, the New Prince may not count. Not anymore, at least.
- Humanoid Abomination
- Iconic Outfit: A steel mask and leather apron, very similar to that worn by John DeFoe, as well as his entire body being covered from head to toe in bandages. The bandages are a holdover from Theo's dressings after he was injured, and the mask and apron are, indeed, artifacts of John DeFoe that Theo was wearing at the time. It is also significant in that John DeFoe, as the Bridge, was instrumental in Theo's transformation, and is thusly reflected in his design.
- Power Floats: Levitates off the ground at all times. This could be an indicator that he is a more fitting servant for Chzo, a being of magic, than Cabadath, who is always seen walking. Given Theo's broken body after the blast, it's also possible that his feet just don't work anymore.
- Tragic Monster: Was made Chzo's servant by force, just from being in the wrong place at the wrong time.
- The Dragon: Shares this role with Cabadath, to Chzo. For a few seconds, anyway.
- Walking Spoiler: It's hard to say anything about him without spoiling the fact that he is a transformed Theo DaCabe, having murdered Cabadath and taken his place after he outlived his usefulness.