WARNING: Untagged spoilers ahead. Read at your own risk.
- Thomas' ethics. In the behind-the-scenes video Thomas and Joan said that Logan and Patton are named after Logos and Pathos, two of Aristotle's ingredients for persuasion. They left out Ethos, though, the appeal to ethics. Possibly named Ethan, as it fits with the pattern.
- Thomas' sexuality. As in, not that he's gay, but the part of himself that longs for physical attraction (as opposed to Roman, who is all about the romantic side of relationships). This is the side that makes Thomas talk about his butt a lot on tumblr. Possibly named Eric (derived from Eros, the Greek god of physical love).
- Confirmed in a way — Remus represents Thomas' darker, unfiltered thoughts and impulses, including those of depravity, perversion and lust. Case in point, Remus' introductory video has him licking the face of a Mark Ruffalo stand-in and making frequent innuendo.
- Thomas' anger. A side that we usually don't see because Thomas tries not to get angry in public or online, but this is the aspect that holds all of Thomas' rage over injustices in the world and anger at cruel people.
- Maybe part of Anger's arc would be Thomas learning he has to let him do his thing more in order to keep him in check.
- Also, either Virgil will view Anger as a kindred spirit, being a fellow "negative" side that's often misunderstood or ignored, or even he'll be freaked out by him.
- Dealing With Intrusive Thoughts seems to lean in this direction - when Logan loses his cool with Remus and shouts (an unusual display of emotion from him, no less), his eyes flash orange, the color assumed to be given to the remaining Side, and the episode ends with a pair of orange colored eyes set against a black background.
- A side representing Thomas's depression, the exact opposite of Virgil who is just as dangerous to Thomas, if not more.
- Envy. A side who constantly compares everything Thomas does to other, more successful Youtubers or entertainers who make similar content. He'd probably wear a mask of some kind that covers his face.
- Roman - Vanity, Arrogance, Procrastination
- I'd also like to propose Envy. Roman already is vain and gaudy, but Envy leads one to ignoring what they have in favor of comparing themselves to others. As an intense form of desire, Envy's a natural counterpart to Ego; where Roman represents Thomas' hopes, dreams, and fantasies, Envy could embody the bitterness and rivalry towards others who have achieved the same dreams. Roman also strives towards originality as the personification of Thomas' creativity, whereas Envy could lead one to steal ideas, and spite or rip others off for personal benefit. Plus, green would provide symbolic color contrast to Roman's red.
- Procrastination would be almost identical to Sleep (or ‘Remy’ as some fans have dubbed him) from a couple of Thomas’ vines, always moving on to something else more exciting in order to not be doing what he’s supposed to be doing (i.e. Letting Thomas sleep). On the other hand, Procrastination could randomly and abruptly swing to being extremely lazy and not wanting to do anything. He would seem initially very trustworthy and promising to help doing stuff later while suggesting extremely fun things to do or trying to get Thomas and the other sides to take an unnecessary amount of “me time” and rest, but get very snappy and nervous when pestered. This could progress to a reaction almost similar to something Anxiety would induce, but instead leading to panic about ignoring responsibilities.
- All Jossed: It's the more disturbing side of Thomas' imagination, which can be considered a mix of Impulsiveness and Mania below. Roman is Thomas' creativity through a moral filter, while the Duke, "Remus", is the unadulterated and intrusive remainder.
- Logan - Rage, Confusion, Ignorance, Impulsiveness
- Impulsiveness is the following of impulses, which often turn out to be illogical but can sometimes turn out to be instincts warning one of things. Impulsiveness would be constantly trying to convince Thomas to do self-destructive things via call of the void, like throwing his phone out of a high-story window or just sort of jumping out of a moving car for no reason. Impulsiveness would be extremely persuasive to the other sides especially, his influence making everyone more complacent to his "ideas".
- Sorta Confirmed: He's Roman's counterpart, but Remus is the embodiment of Thomas's often impulsive intrusive thoughts, complete with him specifically using "jump out of a moving car" as an example.
- Impulsiveness is the following of impulses, which often turn out to be illogical but can sometimes turn out to be instincts warning one of things. Impulsiveness would be constantly trying to convince Thomas to do self-destructive things via call of the void, like throwing his phone out of a high-story window or just sort of jumping out of a moving car for no reason. Impulsiveness would be extremely persuasive to the other sides especially, his influence making everyone more complacent to his "ideas".
- Virgil - Apathy, Complacency, Mania
- As mentioned in the above WMG, Depression also works. Depression and Anxiety tend to go hand in hand; as one goes up, the other often goes down. Apathy is also one symptom of Depression, as is hopelessness. The fatigue and lethargy governed by Depression would also oppose the sleeplessness and stress Anxiety exhibits. While Anxiety was initially seen as an antagonist holding Thomas back, his criticism and worrying over Thomas' safety are often taken constructively; Depression is often mistaken by the masses as "sadness" which itself is seen as natural, but Depression can be actively destructive, and can push people to self-harm or worse when paired with Anxiety. And of course, in contrast to the bright colors worn by all of the Sides, Depression leads one to seeing life as bleak and colorless, even gray.
- Mania is defined as excessive enthusiasm and is characterized by euphoria, over-activity, and excitement which can lead to reckless actions as people caught in it can’t or won’t see the consequences of their actions. Where Anxiety is constantly keeping the other sides and even Thomas in check by fear of possibilities, Mania would be constantly pushing everyone to do all sorts of (possibly dangerous) things by inducing an almost hysterical over-happiness.
- Alternately, Virgil doesn't have a counterpart, because he previously was a Dark Side.
- Something that could foreshadow this theory is one of the latest "Sanders Sides" official merch posters. It features cartoon portraits of Roman, Patton, Thomas, Logan and Virgil. While Thomas' portrait is framed with a full rainbow, the others are with different individual colors of the rainbow each, Roman in red, Patton in blue, Logan in indigo and Virgil in purple. These color codes had already been established, but what is new is that in the "Sanders Sides" logo in the poster each letter of the word "Sanders" has been colored with one of the colors of the rainbow, S in red, A in orange, N in yellow, D in green, E in blue, R in indigo and S in purple. If the seven colors are present in the official logo, that means that the Sides would sport the seven colors of the rainbow when they're all revealed. If Deceit is yellow as already established, only orange and green would be left to be assigned for the remaining Dark Sides.
- The merch poster in question is here.
- Confirmed for green.
- The merch poster in question is here.
- Another possible foreshadowing comes from a new piece of merch released in November 2019, the first ever piece of merch dedicated to character Thomas, a t-shirt with a portrait of flowers, which features seven flowers of each of the colors of the rainbow, which would represent each of the Sides, including an orange flower representing a possible future orange Side. Theories like this one have been discussed about the meaning of each particular flower related to each Side, as people has seen parallelisms between each flower and the Side it represents. These theories try to guess the possible identity of the future orange Side, based on the meaning of the orange flower featured on the shirt, with various results, like anger or wrath, stubborness, and more.
- Alternately, Deceit IS meant as a foil to Logan, with Virgil having no counterpart, since he used to be one. The Orange Side will only mirror Patton.
- Alternatively alternatively, Virgil is Patton's foil. Patton is Morality. Virgil is that morality taken to paranoid levels.
- Building on this, two out of the other three Dark Sides minus Deceit would each wear orange and green, respectively. The strongest one, would wear black and gray, and during the finale Thomas will wear white. They would have all the rainbow colors, and Thomas did say that he has the color of the rainbow... And when white light meets a prism, guess what color it turns into. Also, the reason that the strongest one would wear black and gray is because not only would he contrast with Thomas and the rest, it is said by Patton before that "you always see rainbows best after a bit of rain".
- Confirmed so far with red and green (Roman and Remus).
- This theory is supported by the 2017 Christmas Special end credits scene; the Sides hold a Secret Santa for each other, and Virgil's gift to Patton is a card with a Misleading Compliment on it. ("You make me want to die...With laughter!")
- He was the closest thing to an antagonist in the series for a good while, to the point where prolonged exposure to his room corrupts the other Sides.
- He's the only side other than Deceit to wear noticeable makeup, and on both characters it's designed to amplify their respective aspects. Virgil wears eyeshadow to resemble dark eyebags, like he never sleeps due to being anxious. Deceit looks reptilian like a snake, an animal commonly associated with deception and lying.
- His name doesn't match the other three, ending with the letter L instead of N. This could hint at the Dark Sides having names that end in L.
- When Deceit finally reveals himself, he's staring right at Virgil, who returns the stare. The whole exchange has a very "hello, old friend" vibe.
- Deceit almost gives Thomas a panic attack by claiming to have been his morality the entire time. Panic attacks are something that feed into anxiety (read: Virgil), which implies Deceit is capable of heightening Virgil's anxiety. This implies that Virgil may have a severely antagonistic relationship with Deceit, to the point of some kind of We Used to Be Friends situation between them...
- A strike against this: Joan told that Deceit was originally the second one to be revealed, but that it made more sense to have him as the first.
- And if Virgil is revealed to be a (former) dark side afterwards, Deceit is still the first one revealed.
- Both he and Deceit appear suddenly instead of doing a Lead In.
- His room corrupts the other three main sides, but Patton’s room only affects him. This implies only Dark Sides are affected by non-Dark Side rooms, and vise-versa.
- Confirmed in "Dealing with Intrusive Thoughts".
- Lionel
- Guile
- Robert, Louis, Steven or Stevenson
- Jekyll
- Harvey
- Russo or Russel (as in Ruse) or Webster/Web as in (Web of Lies)
- Derek (similar sounding to direct and could be both a Meaningful Name and Ironic Name for him)
- Lyle
- Something that sounds like 'Patton'
- Something tied to mythology, possibly derived from 'Apate' (which also sounds like Patton)
- Possibly, also linked with mythology, Dolan (derived from the Greek God Dolos)
- Lou (as in Illusion/Delusion or Lucifer)
- Or derivates like Lucian, Lucius, Louis
- Lars
- Iago
- Dennis. It sounds like "denies" or "denial", which plays into how he's mainly hiding things from Thomas himself, plus it would allow one of the sides to refer to him as a "menace"
- Possibly Ethan, as derived from Ethos just as Logan and Patton's names are taken from Logos and Pathos. While Logos is an appeal to Logic and Pathos is an appeal to emotion, Ethos is an appeal to the credibility of the arguer, which fits his initial masquerade like a glove.
- Plus, one could see it as him trying to disguise his name, to sound like one of the Light Sides, ending in an or oh, just as he does with his appearance.
- Ovid, for a Historical In-Joke tie-in with Virgil and for its similarity to "ophidian" (snake-like)
- Lucifer, straight up Lucifer. Probs too on the nose since the namesake is considered the "Father of Lies". Also not likely since the series has avoided any direct mention to anything related to Christianity. But there is still a chance there.
- Preston, since Deceit is said to be the side of self-preservation, his actual name might be more closely related to his overall function than the aspect of what he is.
- Janus. The two-faced Roman god of beginnings, endings, and doorways. If Virgil and Remus are any indication, the Dark Sides seem to have something of a Rome motif going on, and he is, quite literally, two-faced. Plus, Janus was an ally of Romulus, and Roman is, seemingly, the Side most valuable to Deciet's manipulations, through false compliments.
- Confirmed in Selfishness v Selflessness Redux.
- Something boring and normal, with no actual meaning, like Steve or Carl.
- Lee
- From this theory, which utilises the reference in Patton's outfit to To Kill a Mockingbird in Selfishness v Selflessness, Horace also seems to be a likely candidate.
- Alternately, ALL of them. Less obliquely, Deceit will "reveal" his name several times, only for it to turn out he was, ya know, lying, as he names a different one in his next appearance. We may never learn which, if any, is his "real" name.
- Follow-up: His real name will be revealed, completely unceremoniously, when Virgil, exploiting his talking in reverse thing, asks him "what's NOT your name?", thus forcing him to say his real name in response.
- Confirmed to be “Janus” in “Putting Others First”.
- Deceit did seem to be very good at keeping Roman wrapped around his finger in both episodes he featured heavily in.
- Confirmed, in a way. After Selfishness vs. Selflessness, Roman became more defensive against Deceit than he was before. when he'd be mistrustful, but easily led with kind words, and goals that aligned with Deceit's own. When Janus admits to making mistakes, and equivalates himself with Roman in Putting Others First, the damage has already been done, and, when Roman looks to Janus for reassurance on a statement from Thomas that he believed was a lie, Janus's silent nod of a response was interpreted in the worst way possible, because Roman was already expecting the worst.
- Related to the above WMG, we may visit Roman's room as part of the Deceit vs. Creativity arc.
- It might also be in a two-part video, as was the case with Virgil and Patton's rooms.
- Jossed in "Dealing With Intrusive Thoughts".
- This could be the reason why Deceit told Remus to go out and wreak havoc on the sides by introducing himself to Thomas
- He will be The Faceless ,constantly wearing a mask
- He will be great at impersonating the other sides, maybe at the same level or better than Deceit
- He is jealous of the other sides and wants to be like them
- Rather than having his own body/voice, he simply appears as one of the other sides or imitates their voice as he is desperate to be like them
- A point either for or against this: In "Selfishness v. Selflessness", when Patton asks if Deceit is his real name, Deceit replies "yes". This could also be evidence against because, ya know, DECEIT.
- Jossed: Virgil tells the other Sides "you literally know him as Deceit". He says "you", not "we", which means Virgil knows his real name and it's different from Deceit.
- Or the other personality is the one focused on Thomas's self-care. Deceit is self-preservation and if you don't care for yourself and your own needs, you're failing at preserving yourself.
- Alternately, one is the side we've seen that gives bald-faced lies and is incapable of speaking a true thought, and the other represents half-truths and lies of omission, the mixing of truths to give the lies credibility.
- "Dealing with INTRUSIVE THOUGHTS" implies that Virgil may once have represented Paranoia, which could mean his opposite previously was related to Thomas' sense of security and faith in others. A few betrayals and breakups later, that security is lost, and that paranoia becomes validated and turns into Anxiety.
- Follow-up idea: Roman invented "Daydream Mode" specifically so that Thomas could enhance and focus in on his creativity, the function Roman's Room serves, without Remus's involvement. Furthermore, a later episode will involve Remus getting jealous, and showing off his version: NIGHTMARE MODE.
- Potentially we have already seen NIGHTMARE MODE. During the song from Dealing with Intrusive Thoughts.
Or
If there are four of each, that one current dark side used to be light. My vote? Puritanical side.
- Jossed. In a VidCon Q&A Joan confirmed there were two more Dark Sides in the works after Deceit, and before the end of Selfishness V. Selflessness, Virgil tells Thomas not to let Deceit or any of his friends stick around as long ever agin. Friends plural.
- Alternately, pre-split Cretivity's name was Regulus, a Roman name meaning 'prince' or 'king'. Roman and Remus share the naming theme of Roman mythology, and they could have each 'taken' part of Regulus' name when they split; Remus taking the name itself, as the two names sound very similar, and Roman taking the meaning of the name, and crafting himself a prince-themed identity.
Basically, Patton deciding that the certain other sides are bad for Thomas is what made him cut them off from the rest of his mind in the first place. That's why both Deceit and Remus seem to take extra joy in freaking him out - it's petty revenge.
- In the same episode, Patton is revealed to be the main cause of Thomas's problems with Remus, as a result of Catholic beliefs that became harmful. Morality, as an extreme, could become a severely puritan Side that fully focuses on Black-and-White Morality, which will ultimately be harmful because nobody is perfectly moral, and it's an impossible standard to live up to. Looking at it this way, Morality could also be a "Dark Side".
- Essentially, none of the sides are essentially good or evil, or light or dark. They are simply more or less intense than the others.
- Comment: However, light/dark and good/bad are not necessarily synonymous. Dark can be used as a synonym of "hidden", in the sense of hidden to Thomas, and in that sense, there are certainly Light and Dark Sides. It is never said that the Dark Sides are inherently bad, except by Patton, and he's only expressing his opinion about good and bad, which may or may not be accurately reflecting their true nature.
- He's mentioned as being a real person and different from a side multiple times in-universe, so no.
- This is highly unlikely, even in theory. Sleep isn't "evil" in any way; he's just a finicky sassmaster. He also isn't part of the Sanders Sides universe, and Word of God confirms that he won't be joining them, so the Sides's names would have no bearing on his own.
- Janus is capable of telling the truth, despite his reputation as a liar. He merely denies certain points of view that others regard as "true."
- Janus prescribes self-care and selfishness, a form of denying outside interaction for the sake of one's sanity.
- In Putting Others First, when faced with the Trolley Dilemma, Thomas cycles through different options, each one named for a Side (Morality, Anxiety, etc.). Janus's symbol in the choice list is labelled as Denial.
- Janus and Remus have also mentioned Virgil's reluctance to share his name, with Janus' lines in Selfishness v Selflessness being particularly suspicious:Janus: Oh, so you've never been reluctant to share anything with the group, then?Virgil: Don't.Janus: What? I just meant your name!Virgil, clearly angry/upset: DON'T.Janus: Maybe that's why it's so easy for you to recognise me for what I am. Like I said... it takes a liar to know a liar.
- An alternate theory surging from this theory is that Virgil would actually be the black Side, based on how his season 1 outfit was all black, but he usurped the purple color to join the Light Sides. This would mean that the next Side would be the original purple Side and that a clash between these two Sides may happen when he shows up.
- Jossed now that Joan has moved making it much harder for them to appear as a reoccurring character
- Supported further by Logan's eyes flashing orange (the presumed color of the remaining Dark Side) in "Dealing With Intrusive Thoughts." Particularly based on Remus's reaction - he seems particularly pleased at the appearance of Logan's anger, as if, perhaps, he was trying SPECIFICALLY to invoke this particular side.
Janus can make the others shut up, by letting them cover their mouths. He was also the reason why the Dark Sides' existence was able to remain unknown, because the ones who wanted to reveal it had to remain silent.
Remus appears while sprouting a lot of things that the others do not want to hear. A way to deal with him is stop listening to what he says, and not doing anything with it.
And now, Logan's eyes have glowed orange, and Thomas has posted a photo of orange eyes on his Twitter as well. There is also the concept of 'blinded by rage'.
There was a fourth monkey, 'Do no Evil', which was included at the earliest interpretations of this trope, but is not usually featured in modern works representing it.
- Virgil, being a former Dark Side, could represent 'do no evil' since feeling anxious usually makes one want to not do anything.