A child with two personalities sharing the same body. The two personalities are playing a game of Sburb, in a supposed two player session between both of them. Though initially hinted to be trolls, the child belongs to a new race entirely, Cherubs.
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Both of Them
After the End: Their world is so old that their sun is now a RED SUPERGIANT that's ready to collapse any day now, and its original native inhabitants are all dead. It's also covered in pixelated Statues of Liberty/Shout Outs to Planet of the Apes, and the pair live in decaying buildings on the Troll's meteor, which has since hit Post-Scratch Earth, which was relocated from the dying B Universe to another sun.
Alternate Universe: Thanks to WEIRD TIME SHIT, this lets them treat the events of the A1, A2, B1, B2 chain of universes as ancient history/legend and as events taking place at the same time, though evidence shows that they actually are not as separate as Calliope believes. They in fact live on the Troll Meteor which has hit a version of planet Earth, which was removed from orbit around our sun and placed in orbit around theirs, according to Hussie's Author Avatar.
Cherubs seemingly don't even have gender in the same way humans do, but both personalities have opposite identified genders. In fact, there's no way other than eye, cheek swirl, and blood color to tell them apart before maturation.
Mature cherubs avert this trope appearance-wise, but their body appears to be sexless or Hermaphroditic, as males can become pregnant if they lose to females in their mating ritual duel.
Ascended Fanon: A thirteenth "Ophiuchus" troll with the tag UU has been speculated since Act 3 when the Trolls were revealed. Could potentially be an I Knew It, as Act 6 has been planned out in advance since Act 4 at least.
Take That, Audience!: There are two characters with the tag UU and Ophiuchus-related symbolism, which was done to deliberately avoid validating any fan theory. And later, they're shown to not even be trolls at all!
Subverted. Their shared modus is JUJU. Putting something in it sends it to the other's Sylladex. In any other player's hands, this would be Awesome And Practical. In theirs it's as impractical as you can get, but nevertheless resembles the key mechanic in Bughouse Chess, reinforcing the story's Chess Motif.
Averted once Caliborn gained complete control of his body, it loses the Bag of Sharing and... Allows him to just retrieve items without any bullshit.
Balance Between Good and Evil: Adult cherubs serve as a powerful cosmic force for this trope, helping to promote the growth of civilizations within a universe and thus allowing a universe to reproduce via Sburb.
Cherubs have coloured blood like trolls but are distinctly different from trolls, sharing two persona (one "good" and one "evil") in the same body until maturation at which point one becomes "predominant" over the other. Until that time, one is active while the other sleeps, and their blood & eye colors and facial markings switch when they personalities do. It's unclear whether blood color is tied to gender or morality. Upon predomination, a cherub develops wings and claims a huge swath of interstellar territory, fueled by the death of the star that incubated their egg for millennia.
Their reproduction is entirely by kismesissitude, driven by their attraction to / loathing of cherubs of the opposite gender and Character Alignment. Mates find a black hole with a dying star and duel in the form of titanic, nigh-immortal serpents until one dominates. The loser is fertilized and loses its territory. If the male is fertilized, the alignment & gender pairing of the parents is copied in the two personalities of the child; if the female is, it flips. Other than that, biological gender is cosmetic. Children grow up wholly alone except for their hated other personality, leading good cherubs to become benevolent loners and evil cherubs to become cruel tyrants. Eventually, the loneliness of losing their other self drives them to seek out a cherub like their other half and repeat the cycle again.
British English: Both of them are a bit British in their mannerisms, or rather a little English.
Cthulhumanoid: The Cherubs that briefly appear in the Act 6 Act 5 Act 2 introduction have this sort of appearance.
Expy: Calliope functions as a mixture of Jade and Karkat, in that she's an alien, but still a kindly Oracular Urchin. This is seemingly intentional; her computer's symbol contains both green and grey. Caliborn seems to more directly emulate Karkat, some of Terezi's early chatlogs, and Gamzee.
Darker and Edgier/Lighter and Softer: Calliope is a lighter version of Karkat, Caliborn is a darker version, both literally and figuratively since their chat colors are lighter and darker shades of grey than Karkat's respectively.
And of course, they look exactly like Lord English, while their cheek spirals are taken directly from Billy the puppet.
Fan Nickname: Their shared body doesn't actually have a name as of yet, so some fans have taken to simply referring to it as "Cherub". "Uu" has been used a few times too.
"Cali" is popular as well given both their names start with it.
Faux Symbolism: In universe, they've been associated with the symbols associated with Karkat, as well showcasing exaggerated aspects his personality. Together, Calliope and Caliborn's text colors (#929292 and #323232) average together to be Karkat's (#626262). Their symbols contain candy red for Caliborn and lime green for Calliope, which are Karkat's blood color and where his blood color would be in the order the trolls are listed in, if he had a normal blood color (ie, between Sollux's mustard and Nepeta's forest green), in addition to lighter and darker shades of grey. These colors are their blood colors as well.
Good Counterpart: Although they weren't exactly evil, Calliope is a kind counterpart to the trolls. Even her communication program indicates this: she's not trolling, she's cheering!
Evil Counterpart: Caliborn though is just mean, and his communication program indicates this: he's not trolling, he's jeering, and he's looking forward to the chance to kill Calliope when the game starts.
Jekyll & Hyde: With Calliope as the "Jekyll" and Caliborn as the "Hyde."
Last of His Kind: While Cherub reproduction is very unknown, they seem to be the last surviving Cherub on a barren planet.
Averted, as it is only natural for a Cherub to be the only one of their species on any given planet.
Like Father, Like Son: When a male cherub gives birth, the child is born with the same alignment as the parent with the same sex. Opposite from the females, where the alignments are flipped. This is why Caliborn is like his father and Calliope her mother.
Messianic Archetype and Satanic Archetype: Aranea states that cherub siblings and parents tend to be like this, one being pure good and the other being pure evil. As per tradition with these tropes, it's implied that this extends to their affects on others; Calliope's positive personality, for example, is hinted to have brought out the best in Gamzee, whereas Caliborn's influence only serves to corrupt him further.
Meta Guy: Calliope is a reference to MSPA's fandom, while Caliborn is a reference to its anti-fandom. They lampshade a lot of things, including Calliope's own exposition and the colors of the pesterlogs.
Off the Rails: What little that has been seen of their session is incredibly bizarre and doesn't correspond to any other session: Dersites wear white while Prospitians wear black, and Skaia has clouded over and become stormy. According to Aranea, cherubs were never meant to play SBURB themselves.
From Bad to Worse. So much worse. At the very least, an entire planet and a player were prototyped - or worse - when the sprites of both players were released at once, collapsing into a black hole.
Harder Than Hard: The session isn't a null or void session, but a dead session, which is what happens when you try to do a one player session: The Kernel becomes a blackhole, sucking the planet in, and the game will never produce an universe even with outside help. It can only be won in a different sense. Just to truly enter his land and actually start the game for real could take years.
Our Angels Are Different: Cherubs are incredibly solitary creatures, their only form of romance is Foe Yay, and they look like Lord English (with white or black wings if they mature normally).
Their species' desire for their lost "other halves" being the motivating force behind their sexuality is reminiscent of Aristophanes' speech in Plato's Symposium (possibly more familiar as "The Origin of Love" from Hedwig and the Angry Inch.)
Calliope is kind and "cheers;" her brother threatens and "jeers." One is a huge fangirl of the game and the human players; the other professes to hate it all. Their typing quirks are a mirror of each other - all lower case bUt U's or ALL uPPER CASE BuT u's, and their SBURB classes are the most extreme opposites in terms of the active/passive split. Calliope is a fantastic artist while Caliborn can barely draw a straight line.
This even extends to their (alleged) blood colors and the Fantastic Racism attached to it: she's lime green, while he's cherry red. Also Calliope's tongue is white, while Caliborn's is black, probably the most blatant Yin-Yang reference.
To both confuse and reinforce the trope, Calliope considers Caliborn a brother, but Caliborn thinks that human concept is insulting and refuses to consider Calliope his sister, though he does state (via narration):
You love having a dead sister. Having a dead sister is an experience you would highly recommend to everybody.
And according to Aranea, this applies for all Cherubs when they are first born.
Split Personality Merge: It's hinted at that this is the natural course of maturation for cherubs, and by killing Calliope Caliborn will be unable to grow up psychologically.
Split Personality Takeover: Caliborn takes complete control once their Sburb session begins, symbolized by the spirals on his cheeks becoming solid red circles. Aranea believes that restoring Calliope is the key to defeating Lord English.
Stealth Pun: There are two UUs, or two double u's, i.e.: WW.
Calliope is the fandom avatar, Caliborn is the anti-fandom avatar. In other words, they're u!
Caliborn's terrible drawings are seemingly actually done in MS Paint, making them the first since the first panel of Jailbreak.
Superpower Lottery: Both cherubs are stated to have the two most powerful classes in Sburb. Calliope is the most passive class, the Muse of Space and Caliborn is the most active class, the Lord of Time. They also both naturally have abnormal abilities, according to Calliope.
Theme Naming: All of the other handles have initials that correspond to the base patterns of DNA (except John when he changed his handle). Their shared initials come from uracil, a base pattern in RNA (which replaces thymine). Both of them have the word "Umbra" in their names, which is used to refer to the deepest and closest shadows cast by celestial bodies, which may also tie into the fact that they consider the human sessions to be mythological, as historically, celestial bodies were considered gods.
Tertiary Sexual Characteristics: Subverted; Calliope is introduced with visible eyelashes. However, because of the fact that they share a body, her brother also has the eyelashes.
This Is My Side: Calliope is chained so she can't reach her brother's side of the room. Before she goes to sleep, she makes sure to fasten the chain that prevents him from reaching her side of the room. The area both chains reach just contains the exit and sarswapagus.
Unwinnable by Insanity: Because Caliborn killed Calliope's dream self, the session is considered one-player, and is therefore a "dead session." In Sburb, this is basically the worst thing ever.
Verbal Tic: They both have a tendency to repeat things 11 times similar to Vriska's 8 based tic.
Walking Spoiler: Several bits of information crucial to understanding these characters are tied to huge spoilers: the fact that neither of them are Trolls (in spite of what the story suggests up until that point), the fact that they share the same body, the fact that Gamzee raised them for a time, and the fact that they look like young versions of Lord English (and one of them outright is Lord English). The last one is so surprising that Andrew Hussie released fake pictures of Calliope's appearance shortly before The Reveal.
They inspired a lot of it. A lot of it, so much so that a hefty portion of the Jossed section are disproven theories on Calliope's identity. And once their true identities were revealed, even more speculation came around.
A kindhearted Cherub who cheers Jane and her friends on in their quest. She is beginning her own session with her brother, and is fascinated with the four human and troll sessions.Her Strife Specifus is set to WANDKIND, which has an object duality to PISTOLKIND. Her Juju is/was a green Lollipop.She is the Muse of Space of her session. Her chumhandle is uranianUmbra.
she commUnicates Using lower case except for the letter U
Uses stUpid-looking emoticons ^u^ <and emotes!>
and Uses faUx british phrases sometimes too love
A Form You Are Comfortable With: She takes on the form of her Trollsona when she meets Roxy in the dream bubbles, presumably because she believes herself to look hideous. However, Roxy claims that she's absolutely fine seeing what Calliope really looks like, making this an Inverted Trope.
Ascended Fangirl/One of Us: Just as how all the trolls represent common internet archetypes, Calliope represents the MSPA fanbase. She's read about all the kids, made fanart of Dirk (and Cal) as the Prince(s) of Heart, and written fanfiction that she's embarrassed to share.
She also enjoys speculating about them, though admits the fanfiction is something she enjoys more, reflecting that theorizing is less popular than the absolute deluge of fanworks.
She also represents the fans that try to get other people to read Homestuck, even if they have no interest in it.
Big Good: What her alternate, doomed-timeline self hopefully is, being theoretically as powerful as Lord English.
British English: Most noticeable in her terms of affection and use of words like coloUr.
Aliens of London: Lampshaded by Dirk and Calliope herself. Her quirk is learned behavior, which is why she wasn't quite sure about how she used the phrase "Bob's your uncle," not actually knowing what an uncle is.
Her debut conversation starts out very much like Karkat's debut conversation, except she's actually nice to Jane.
At one point Jade tells Karkat that if he was nicer to her she would have believed what he was saying. Jane specifically says that Calliope's niceness is what makes her somewhat more believable.
Her refusal to spoil things before the Kids reach them smacks heavily of Jade's own philosophy up through Act 5.
Her fanart is titled "dirkisthisyoU" and "roxyisthisyoU" - a reference to Terezi's drawings.
Chekhov's Gunman: Jake mentions here that someone had to twist his arm to get him working on the bunny. When Calliope talks to Jake, she mentions giving him "more arm twisting", revealing that Jake was referring to her.
Cosplay Otaku Girl: She enjoys cosplaying her own fan character and spent some time dressed as her during Act 6.
Critical Research Failure: If her drawings are any indication her troll fan character always tries to avoid conflict and has a nice and lovely personality (like herself). Most actual trolls are not defined by these traits, to say the least.
Dungeon Bypass: Much of Act 6 since her "death" has focused on finding her in dream bubbles, to defeat Lord English. This whole process is rendered irrelevant by Calliope herself telling Roxy her name, and that calling it out to Caliborn will cause her to take over their shared body.
Ironically she genuinely becomes an Invoked example of a Mary Sue, as she's a MacGuffin Girl that most of the dead dreamselves are searching for to defeat Lord English.
I Am Not Pretty: She dresses like a troll because she thinks she will never be truly beautiful, though she's still pretty cute as far as green skull monsters go.
Killed Off for Real: Her dreamself. Her actual self is still technically alive, but asleep, since Caliborn is in control of their shared body. The way that Caliborn is monopolizing the body shows that she's not coming back anytime soon.
Man Behind the Man: Calliope is responsible for quite a bit of the events that occurred in the two human sessions.
Meaningful Name: The "uranian" in her name refers to the unique sideways rotation of the planet Uranus, which she admires for its resemblance to a pool ball's topspin, or "english". Umbra usually refers to the deepest part of a shadow cast by a celestial body; taken literally her name means "The shadow cast by Uranus" or more symbolically "the shadow cast by [the planet with the] English".
Calliope is the name of a famous Greek Muse. Specifically the muse of epic poetry (that is, heroic stories). She is also commonly depicted as holding a tablet - think fanart. And of course, it starts with "Cal" which turns out to be her brother's nickname for her.
Also, Urania is the name of another Greek Muse: the muse of astronomy. Urania was said to be able to tell the future by looking at the stars - similarly, as a Prospit dreamer, Calliope can see visions of the future while dreaming by looking up to the clouds of Skaia.
Both Calliope and Calliope/Cal from Middlesex have bodies of ambiguous sex.
When she was first introduced, many fans pointed out that "uranian" is an archaic term for "gender variant". This is one of many things that lead to a I Knew It moment when it was heavily implied and then outright revealed that Calliope and Caliborn shared a body.
Ms. Exposition: Explains about Sburb titles, and seemingly has spent time researching them.
Mystical White Hair: In her cosplay outfit. She's cosplaying a limeblood, who were known for their powers.
Nice Girl: She's one of the most helpful and polite characters in Homestuck. She even tried to get along with her Jerkass brother, who unfortunately does not want to return her favors. Her kindness is even demonstrated when she contacts people: she's cheering them!
Oracular Urchin: Another Prospit dreamer who awakened before the game. Calliope also has the ability to communicate across the timeline like the trolls can but is doing so before entering the Medium. Calliope knows that the B2!Kids will meet the B1!Kids and promises that together they will escape the influence of the Green Sun and build a safe future for their descendants.
She also has Rose and Kanaya's detailed walkthrough, so she's able to convey a lot of information about Sburb's mechanics.
In universe it's complicated as well. It contains both Grey and Green, matching her Expy nature to Jade and Karkat. The lime portion of her symbol matches the color used for First Guardian powers and Uranium both. Limebloods are also the Troll caste in between Sollux and Nepeta, aka where Karkat would be if he had normal troll blood, though this fact turned out to be Fauxshadowing.
The use of the Caduceus is also symbolic in universe, as Greco-Roman mythology influences the Denizens, amongst other things.
Ship Tease: She acts British, so a lot of her lines come off as rather flirty.
The Smart Girl: Fits pretty well, and gets easily flummoxed by Roxy. She's apparently spent some time researching the B2 Session and the legendary figures (i.e. the players) of it, and knows quite a bit about Sburb titles.
Space Master: Has the potential to be this due to being the Muse of Space.
Stealth Pun: Her symbol's (and blood) color is lime. "Limey" is old slang for Brits, particularly sailors.
Calliope was hinted to be a Troll and is a fan of the Sburb players. In other words, a fan troll (all of which were jokingly canonized by Word of God).
Stepford Smiler: She's one of the sweetest characters in the comic. She also pretends to be a troll because she finds everything about them to be better than her - prettier, more fun, more interesting social dynamics. She also feels that nobody would ever love her, or bother to kiss her back to life.
A mean spirited Cherub who jeers Dirk from time to time. He detests everything, most especially his "sister", Calliope, and the four human and troll sessions. He will grow up to become Lord English. His Juju is/was a red Lollipop.He is the Lord of Time of his session. His chumhandle is undyingUmbrage.
COMMuNICATES uSING ALL CAPS EXCEPT FOR THE LETTER u.
DROPS IN A LOT OF PERIODS. WHERE YOu MIGHT EXPECT COMMAS INSTEAD.
AND ALSO. SOMETIMES ENDS STATEMENTS WITH A QuESTION MARK?
uSES RuDE EMOTICONS LIKE tumut
#HAS TAKEN TO SPEAKING IN ALL-CAPS AND WITH HIS SISTER'S BLOOD COLOR. AS A TOKEN OF HIS RUTHLESS TRIUMPH.
All Women Are Lustful: A firm believer of this. When he briefly sees Roxy and Jane on the same screen, he expects them to start cuddling immediately.
Ambition Is Evil: Invoked. Ambition is the only human quality he admires, which serves to make him look more like a jerk.
Ascended Fanboy/One of Us: Inverted. He represents anti-fans of Homestuck, particularly people who complain about being constantly told by fans to read the comic but don't find it enjoyable. For example, his vehement dislike of the colored pesterlogs refers to a common criticism about the comic. Due to the rest of his personality, he may serve as a Take That, Critics!.
He also represents much of the negativity of the Homestuck fandom, serving as a Take That, Audience!. His complaints about the kids wasting time refers to the fans who want the plot to move faster instead of having romance drama or humorous interludes.
uu: OH MY GOD. WHO CARES? uu: IT'S JuST SOME MORE POINTLESS TRASH FOR YOu TO OBSESS OVER, AND DISTRACT YOu FROM GETTING ANY ACTuAL RELEVANT SHIT DONE. uu: THE AMOuNT TIME YOu PEOPLE WASTE. IT IS FuCKING uNBELIEVABLE TO ME. uu: I READ ABOuT SOME OF THE THINGS YOu AND YOuR PREDECESSORS HAVE DONE. FAR MORE THAN I CARED TO. TRuST ME. uu: AND EVERY TIME. I'M ALWAYS JuST... uu: *GET THE FuCK ON WITH IT ALREADY.*
He has been shown to be overjoyed at the sight of worldbuilding, which is something that Hussie hates.
Armoured Closet Gay: To date, he is the only character in the whole webcomic to express quasi-homophobic attitudes (particularly towards Jake/Dirk) because hey, why not have another reason to hate him? So, naturally, when he speaks with either Jake or Dirk, the Ho Yay goes off the roof. All of this despite the fact that he lives in what may be an hermaphroditic body, but cherub sexuality has been shown to be rather complicated. He clearly identifies as male, so the point remains.
His gushing over how big and strong Quarters and Cans are makes one wonder...
Ax-Crazy: He's playing the game to kill, he plans on killing Calliope, and he's also threatening people with death. It turns out that he has already killed his sister's dreamself by proxy. His reaction to first seeing Gamzee, and being asked by him if he wanted him to be his guide? More Dakka.
Bad Boss: To any version of Jack Noir. Who he proudly proclaims he'll dispose of once they outlive their usefulness.
Blood Knight: He specifically wants the his session with Calliope to be about competition between the players, mainly because he enjoys the idea of bloodshed. When told by Dirk that the game may have assigned him a role that would pressure him into restraining his bloodlust, he blows off the idea.
Book Dumb: He admits that he has trouble learning new things, when he isn't doing things the hard way from some perceived notion of it being in easy mode.
Call Back: Caliborn's first conversation with Dirk, in which Dirk responds that he though Caliborn was angling for him to draw more weird porn after Caliborn acted like Jigsaw, is a reference to Hussie's insane "Cheerfulbear" Saw/Muppet Babies parody, previously referenced by Bro messing with Dave. It's also a call back to when Vriska interrupted John to tell him to get going because he'll be wasting time; turns out he was wasting time because he was talking to Vriska.
Later on he calls back a line from Karkat and a letter from Bro, both of which were previously called back by other characters. The strangest thing is that Dirk finds them both familiar.
He currently wants to make Jake into a Worthy Opponent and become the cause of everything like Vriska.
uu: SO I FEEL THAT. THE MORE I GROW IN POWER. uu: THE MORE STUFF IT SHOULD TURN OUT I AM RESPONSIBLE FOR. uu: UP TO AND INCLUDING. EVERYTHING THAT EVER HAPPENS. uu: EVEN IF IT HAS TO BE. uu: RETROACTIVELY.
TT[Dirk]: What if your real quest is to put aside your differences and work together, if you want to both survive, and grow as a person?
uu: NO. uu: NO. NO. NO. uu: FuCK THAT SHIT. uu: HuMAN FuCK THAT SHIT. NOT EVEN ALIEN FuCK THAT SHIT. SO YOu CAN uNDERSTAND BETTER. THE KIND OF FuCKING OF THE SHIT THAT'S GOING ON. uu: HuMAN FuCK IT SO MuCH. SO HARD, AND SO ANGRILY.
Comically Missing the Point: Happens a lot, since he refuses to even aknowledge how the game is supposed to be played, but reaches a zenith when he is utterly incapable of picking up Hussie's increasingly obvious hints that he should give Leprechaun #7 (the future Crowbar) his crowbar.
Complexity Addiction: Beyond any reasonable extremes. Caliborn tends to do any and all tasks, from the pedestrian to the epic, in the most needlessly convoluted way possible. Calliope, Aranea, and The Narration/Hussie himself all state that Caliborn revels in performing tasks that would make most others Rage Quit right away, and goes out of his way to do such things.
Evil Cannot Comprehend Good: While Calliope at least attempts to understand romance in all four quadrants, he dismisses it as being stupid and asinine. This is probably why his requests for "pornography" are simply mundane depictions of red romance.
He also fails to understand why anyone would bother giving anyone a funeral.
Evil Laugh: After he reveals he killed his sister.
Later he directly echoes Cal's "haa haa hee hee hoo hoo" laugh.
Does a seemingly endless laugh after destroying discs 1 and 2 while saying there's no disc 3.
From Nobody to Nightmare: He goes from being a largely harmless brat chained to a wall far from any other living creature, capable only of verbally tormenting people, to an Eldritch Abomination who tears universes asunder to destroy everything that exists.
Gambit Roulette: The beginnings of his tendency towards such plans are visible in his "art", where he draws a circle using nothing but an enormous number of scribbled right angles by squashing them together in a circular shape. That he expends all that effort rather than just plain drawing a freaking circle shows how, in future, he'll construct convoluted plots and schemes where simple ones would suffice out of the conviction that using a simple way would be dumb and for girls.
Half Truth: Like Doc Scratch, Caliborn enjoys using these on occasion, managing to convince Jane that Dad was being tortured despite the fact that he told her earlier that Bad Is Good And Good Is Bad for him, when Dad was given the 5 star hotel treatment.
Hussie also implies that this is part of the reason that the Cherub session is so messed up. He says that if Caliborn kept attacking the narrative, he would create many problems - including many for himself.
Jerkass: Caliborn is probably the least pleasant character to interact with in Homestuck, and he's more than willing to toss insults at people whenever he feels like it. This extends to people who are trying to help him, and in one case, his loyal acolyte/adoptive father.
UU: his passion for games transcends any hUman Understanding of love. UU: for yoU to Understand it woUld be to fUlly comprehend the meaning of... UU: how to pUt it. GG (Jane): Um. GG: Beauty? UU: horror.
Meaningful Name: undyingUmbrage. Umbrage also means annoyance, or offense. Taken literally, his name could be interpreted as "Eternally annoyed" which describes him pretty well. Umbrage also has an archaic meaning of "shadow", connecting him to uranianUmbra.
"Caliborn" is likely a corruption of "Caliban", though perhaps he bears a closer resemblance to Marvel's Caliban.
It also could be a variation on Calibur, derived from Excalibur, which is derived from Caledfwlch - Dave's "legendary piece of shit".
Excalibur, of course, being the sword of King Arthur. You know, the most famous mythological king of England. The Lord of the English.
Medium Awareness: In a way never done before (in Homestuck at least)! After having entered the Medium, Caliborn is somehow capable of understanding the narration of his thoughts, and goes to express that he has MAJOR PSYCHOLOGICAL PROBLEMS. The only thing close to this is Hussie's dialogue with the reader/narrator. And then he finds an Exile terminal and starts to talking back to the narration....
Mood Whiplash: A funny scene where he wants Dirk to drawn "porn", but without any human sexuality, and just the relationship stuff, whiplashes when he decides that the scene of Roxy and Jake married with a baby isn't cutting it, and he wants a picture of Jake eating the baby. A few pages later, just as we're getting used to Caliborn being unstable but harmless he reveals that he killed Calliope's dreamself.
Act 6 Intermission 4 is almost entirely made of these moments.
Not-So-Harmless Villain: At first he seems mostly bluster, given that we'd already seen trolls who talked big but tended not to follow through, only for him to kill Calliope's dreamself and divide by zero his own session. Not to mention that he's the younger version of the comic's Big Bad.
Odd Name Out: The first person to have a non-uppercase chat handle.
Pet the Dog: Completely Averted. Every time he attempts to reach out to someone, he intentionally uses it as a vehicle to toss cruel insults at his target.
He did, however, refuse to hurt his loyal minion Sawbuck when prompted to by Hussie.
Psychopathic Manchild: Caliborn acts like an obnoxious brat while gleefully thinking about how he killed his sister.
Caliborn's sigil is a red tilde overlaying a capital U, which is a somewhat obscure symbol for Ophiuchus. U is used in ~ATH code as shorthand for Universe, and the shade of red matches Karkat's blood and the color used for the kids' universe. Taken together, the red tilde over a U can be said to resemble a universe bathed in blood, which reflects his Blood Knight attitude.
On the cruxtruder he was using, it showed a red tilde with a lime U, instead of a red tilde overlapping a black U. The Ophiuchus symbol of the tilde and the U together was meant to be a man's arms holding a snake. Here, the arms were Calliope's as the U was lime green and the red snake was Caliborn meaning that Caliborn has escaped from Calliope's grip and is now in complete control of his body and wherever he wanted after escaping Calliope's Juju-enchanted lock.
The timer's display of ~U is similar to ~ATH, or tildeath, coding. While the actual in-universe coding we've seen in ~ATH has been different, some would suggest ~U parses as "At the Death of the Universe," which would certainly be a feasible entry time for anyone entering a black hole, as relativistic time could cause them to experience the rest of the universe in a short amount of time near the event horizon.
The king and queen are wearing each other's hats, but they're still the same pieces. No rules against decorating chess pieces, and even if there were, Calliope did it first. This, understandably, upsets her.
Later, he starts beating Gamzee with a crowbar after being told that he wasn't allowed to shoot him.
The Shitty Twist: He's Lord English. After a major flash sequence that implied it, it was outright revealed in a pretty dismissive way. Though given Hussie's usual narration style, it's still possible for this to be a fake-out, with something more complicated at work.
Later, he decides that, once he gets what he wants out of any given Jack Noir, he'll arrange for his death. "It's bad form to leave stray Noirs wandering around" indeed.
He seems to have grown fond of Hussie, in his own twisted way, and throws a tantrum when Hussie falls silent and "sheer force of petulance" proves no longer able to get him to talk back. He also likes a few of his leprechaun minions, in particular Crowbar.
Since Cal is basically another tool he can use to manipulate people anywhere and anytime(granted there's another Cal on the reciveing end) and Doc Scratch eas made using Cal and a magic cue ball, it's safe to say that this isn't a red herring.
Stealth Pun: Dirk is the only person Caliborn can stand to talk to. In the process of transcription of DNA to mRNA, Thymine is replaced by Uracil. In other words, TT becomes uu.
Take That, Audience!: His complaints about slow pacing were mocked by Dirk for Caliborn actually causing the story to slow down while providing insight into Caliborn's character, much like how the fandom complains about both the slow pace and detailed characterization of some characters being neglected for pacing issues.
Teens Are Monsters: And according to the narration, he will remain that way forever, at least mentally, because his predomination occurred much earlier than for most cherubs.
Terrible Artist: Dear god, he is even worse than Karkat. His "drawings" are indecipherable scribbles, not even coherent enough to be stick figures. Put into perspective, starting here we see Dave and Karkat fighting over a marker, causing them to create an absurd, scribbly mess all over the page (with some crudely-drawn penises courtesy of Dave trolling). When Calliope finds it, she immediately recognizes the drawing style... as her brother's.
He's gotten better: He can draw circles now! Kind of.
uu: I WAS ONLY ABLE TO SURVIVE THE BRUTALITY. DUE TO MY EXCEPTIONAL CONSTITUTION. AND EVEN TO SOME EXTENT. MY ABILITY TO ENJOY ANGUISH.
Of course, he stated he was a special prisoner, which if Mr. Crocker's treatment is anything to go by means the exact opposite of torture. Even if he was serious about how for him Bad Is Good And Good Is Bad, a five star hotel treatment where no harm is allowed to befall him isn't really something to brag about surviving.
Troll: The kind that says you suck and issues death threats, but not the literal kind.