Jack can be classified as an insane, goofy, homicidal, and eccentric maniac who delights in causing mischief and chaos all across the Godverse. He always takes great pride in spreading this mischief and chaos to wherever he dwells. Other than that, Jack is an inherently insecure being who constantly seeks to be his own person and separate himself from the influences of others. He always desires to be this 'independent' and 'unique' figure to keep his relevance within divine society. This desire led him to finally give up his obsession over Error404 and over Alpha!Tale which allowed him to advance as a person rather than a doppelganger. The Virus-God can also be classified as having a multiple personality disorder. This multi-personality aspect of Jack is rarely ever seen, with the rare few who have seen these various personalities in a direct manifestation or by via telepathy tending to be driven insane by the encounter. This insanity makes it difficult to get a coherent description for the base nature of the personalities. Jack himself has often addressed this by describing it to scholars, one on one, that the various different voices in his head or his stray thoughts and inhibitions that find their own independent free will inside his mind. They may find a physical voice of their own through manifesting in basic concepts that Jack has infected with his mentality. These concepts could be the voices of the wind, the trees, the movements of subatomic particles, or even actual replicas of Jack dressed in different attire and radically different behaviors (I.e a cowboy, a lawyer, a football player, ect.). His personality disorder can manifest in these various elements, or simply attempt to bug Jack and lead him to a temporary meltdown. Jack has no lack of control over these voices, nor do they pose him serious harm. They simply try to make things difficult for him

Still related to Papyrus. He is affected with strain E, due to this and that he is one of the two surviving doctors, he wears a plague mask. He will tend to people wither they like it or not. He really doesn't care if you're a villain or not.

Ink!sans : In the long run, Ink!Sans is generally optimistic, has a sense of kindness, In the more serious side, he objectively tries to reason with anyone, and only follows who he finds his best friends. However, he has no soul, and relies heavily on emotion vials. If he stops taking the emotion vials for a certain period of time, he will lose all emotion that he once had and is unable to do any sort of action, as shown in Underverse 0.3 Part 2. This doesn't matter though, as Ink intended to not use his emotion vials for his plan to revive his friend. Overall, this proves him as being villainous and selfish without the "emotion vials".

Slash Sans: Slash always acts tough and brave to protect the threats and destruction ruining others' universe. but sometimes he just does it for his friends. When it comes to a dangerous situations, he always stands up for his friends even when he is in a deep pain, no matter what others say, he refuse to let or see them die. Slash can be weak when it comes to anger, because anger is what drain all of his energy, but that won't last forever as long as others can spare their energy to Slash. Slash can regain his energy back by taking a rest or a nap too. but it's gonna be hard during the battle, He has to find it or maybe borrow some. Slash is a hardworking type, he really loves working day and night himself without even realizing when to get rest. He even doesn't mind overworking. His energy won't last for too long without taking a break if he waste it. Slash is very honest to others, he doesn't like to lie to a friend, not even a little. especially when it comes to telling his friends about his feelings, he never hide anything from the one he trusted the most, Even his biggest secret. Slash is also a promise maker (deal and promise are the same yes i know), he's very good at it, once he made a promise, he keep it. but if he found out you break even the tiniest promise, he is no longer your friend, he won't hesitate to fight or kill you just because u broke the promise. You CANNOT force him to come back to you after that. Apologizing isn't enough for him. when it comes to deal, he always make sure about the deal he is making with someone doesn't include anything harmful!

All the sans are in 7th grade, middle school, before everything. Everyone’s getting taller, and changing. All sans are there.

Classic Papyrus : Papyrus is a flamboyant skeleton who presents a confident, charismatic image of himself. He is thought to have an egotistical personality, referring to himself as "THE GREAT PAPYRUS," possibly as a way to feel as prestigious as his brother. He works hard and, despite his brash personality, is kind at heart. He is optimistic and brave, and is shown to be considerate and forgiving even when the protagonist beheads him in the Genocide Route.[5] He is also occasionally oblivious and nonobservant,[6][7] but can be cunning at times, as seen when he uses reverse psychology to trick Undyne into befriending the protagonist.[8] He is thought of to be somewhat naive by other characters, but not dumb. He shows great bravery as even in the face of potentially imminent death, he drops his guard and spares the protagonist hopes of driving them down a better path. Papyrus believes in others just as much as he believes in himself. He has so much faith in his abilities that he waited outside of Undyne's house all night and begged her to accept him into the Royal Guard. Seeing his persistence, Undyne offered to train him, but instead gave him cooking lessons.[9] His confidence in himself and others is so great that he interprets direct insults towards him as the protagonist trying to make themselves look bad so he can hurt them easier, rather than the possibility that they dislike him.[10]

Divine Dust sans : he's a cunning beast that tracks his targets from afar, manipulating them and hunting them down, breaking them mentally before engaging in a fight with them.

Dustdust sans: As he has nothing left more than his LV and EXP, his personality had left him with nothing but his ability to kill, he is mostly an animalistic barbarian that would attack anything and anyone at any time, going as far as killing an ant for even existing.

True Dust : Righteous is a lot like an opposite of his normal lazy counterpart. He is often busy working on projects or helping people around within the null. He can be a bit unhinged and is bad at reading emotions which can make him seem cold to people. Righteous can often experience PTSD from things that correlate with his past experiences being tested on by Joseph. During mental breakdowns things start to glitch out and if it gets too bad things start to get deleted. Godd and Righteous Papyrus are the very few that can calm down Righteous but others can if they say the right things.

Last breath Sans is, at first, similar to his Original counterpart. However, he quickly becomes filled with rage and anger. He does not (and will not) give up. He is no longer lazy and throws everything he has into defeating Frisk. ( Suggested by bittergigglefan )

( You and Nightmare had been together happily for 2 years. But you come home early from work to find him making out with another girl. )

Ocean: Is a neutral type of god. Which means he isn't evil or good and Ocean Sans only cares about his kingdom. Ocean does seem to respect his Boss, King Multiverse. Ocean dislikes gods that invade his kingdom. Ocean likes to use his water powers to defend his Kingdom and his sea creatures, He likes to talk with Cold!Sans and Dream!Sans, since Ocean likes to visit them a lot. Ocean doesn't eat nothing and he doesn't age, Ocean hates evil gods and Sanses.

He is very much like Undertale Papyrus, but more quiet and cautious. He is currently healing for an injury. He and Abss!sans are in the royal guard. He’s on break from his injury. ( This might be wrong! There’s very little information on the Abyss AU! And someone requested I make all the Abyss AU characters! Yes, I’m a people peaser! Sorry! )

Like the Undyne from Undertale but she doesn’t call people punk or other rude names, will fight, but is polite. Ps- Sorry, this probably isn’t accurate because I couldn’t find anything online! Sorry!

Blue: Sans is a fairly short and overweight skeleton with a large mouth and eyes, tall nose, and eyebrows, along with that his pupils are two hollow blue circles inside each other. Sans wears a ripped scarf with a long cape, along with grey armour with cyan trims and a white shirt underneath, he wears dark blue pants that tuck into his blue boots with dark blue soles and heels. Unlike Undertale Papyrus, he does not wear gloves of any kind, and has his skeletal hands out. He's also biologically different from Undertale Sans, with his mouth being able to open when talking, showing a bright cyan tongue the same colour as his eyes.

Epic : He loves to say "bruh" often, often replacing words with it. He's generally laid-back and casual, similar to classic Sans. He gave himself the title of "Epic!Sans" just because it sounds cool. In the right conditions, he becomes a nerd comparable to that of Alphys. Epic!Sans tends to be a huge flirt to anyone he finds cute. Whenever he's around his best friend Cross (From Xtale), he often engages in meme-related antics. However, when the situation calls, he can be serious and shows uncharacteristic maturity when doing so, despite the omnipresent appearance of his favorite phrase "bruh". Epic!Sans isn't the kind of person who easily forgives, especially when he's betrayed. He'll fight for his life, even at the cost of his own life. In the original story, Epic!Sans was a fusion of Sans and Gaster (source of his scar). His personality was a mix of both Gaster and Sans. To be specific, 90% Sans and 10% Gaster. In the reboot, he's mostly the same, except he isn't fused with Gaster. His role stays mostly the same.

Often goes by Sci : A younger Sans working with Alphys to track the anomalies. He is a lot more excitable, quite like his younger brother, and even has his 'googly eye' movements. Overall, he is a lot happier during this time. Some facts that point towards Science!Sans within the game are the 'joke book inside a quantum physics book inside a joke book inside a quantum physics book', Sans's secret room, and Sans's ability to alter space/game files to teleport at will. He still has his abilities to teleport, summon bones and Gaster Blasters, like his future self, Classic!Sans.

Dream : a byproduct of positive energy, Dream display a quirky, yet not so confident personality. While he is too talkative and over-dramatic, he does give concern that something terrible could happen and, in response, tries to settle down the issue.

The story begins with Frisk dying in Toriel's hands and waking up with a flower on their head. Flowey realizes that a reset occurs each time Frisk dies, but can't explain the flowers. Despite repeated deaths, Frisk refuses to fight Toriel, who eventually lets them leave the Ruins. When Frisk first meets Sans, he kills them after their handshake. In subsequent resets, Sans either kills Frisk or leads them to Papyrus. However, Frisk consistently treats Sans with kindness, which intrigues him. Sans invites Frisk to Grillby's, where they order fries. Sans takes mustard, and Frisk takes ketchup. Frisk always thanks Grillby for their order. Later, Sans reveals he knows Frisk is aware of the resetting timelines because they hand him the mustard bottle. Sans questions Frisk's kindness, to which Frisk responds that they choose to be kind. Frisk invites Sans to return to the surface with them. Sans begins to consider the possibility of people acting good, contrary to the "kill or be killed" nature of their world. Unable to convince Papyrus to befriend Frisk, Sans decides to help Frisk reach the barrier. As they progress, Frisk's body is increasingly consumed by flowers, leaving them blind and unable to walk. They communicate with Sans using sign language. When they reach Asgore, Sans weakens him enough to yield. Sans refuses to kill Asgore, echoing Frisk's words to "always be kind." At the barrier, Flowey suggests using one of the six souls to cross and bring back another. Frisk refuses, offering their own soul as the seventh to break the barrier, despite Sans's devastation. After Frisk's sacrifice destroys the barrier, Asgore acknowledges their act and abandons the plan to destroy humanity. A new community is built, with Sans living with Flowey. Sans often visits Frisk's grave in the Ruins, waiting for their return as he did during the resets.