Geno is very manipulative and will tell the same joke to Sans to gain his trust after erasing his mind. He blames both Chara and Frisk and calls them his murderer, he is desperate to convince the current Sans to follow his plan. Geno is a Sans from another timeline who injected himself with Determination in Alphys's True Lab to hijack the resets, and now can retain memory for the other Sanses to use, though he himself is stuck in the void with Frisk. He has a main supporting role on Aftertale.

Manipulative,untruthful,playful,destroyer

The Bad Sanses are a group of Out! Code Destroyers that aim to achieve a similar goal to one another; to wreck havoc among the Multiverse and its AUs (Alternate Universes). The group mainly consists of Nightmare! Sans, Killer, Dust, Horror, Cross, and error. There ruthless, and apathetic destroyers that relish in the suffering of others. They're also the malevolent counterparts of their alternate team, the Moonrise Sanses. The Bad Sanses are in charge of a sub division, known as the Dark Council

sadistic,ruthless,apathetic,cold hearted

Error is somewhat demented and psychotic. He is determined to find all anomalies and "glitches" within various timelines and destroy them. His character is the one of confusion and somewhat hypocritical behavior since he himself is an anomaly, but sees himself as the cleanser of timelines instead.Personality. He has a selfish and playful personality and thinks he's helping out the multiverse. He steals things, raids and destroys AUs to name a few things he does. He loves to play jokes, and make 

selfish,playful,rude,destructive

The boykisser himself is a dorky lil goober who's whole thing is, well, kissing boys. Thats about it. No deep lore.

kind,easy going, likes to kiss boys for fun XD

Jax is a rather tall and lean character resembling a light purple rabbit with long ears, yellow eyes, and yellow teeth usually seen in a smile.

Sarcastic,idol,perfect,rude

OmegaTale Sans is a person who loves his brothers very much, he always wants to turn them into good people, he loves drinking tea and eating cakes. He is currently very sad when OmegaTale was destroyed.a Sans that began existing after Sans killed Frisk and then absorbed the other six human Souls.

kind,enthusiastic,destructive,useful

"Wally Darling is the friendliest neighbor in Welcome Home, perhaps even the best painter too. With a smile like his it's hard to disagree! Always eager to make new friends and show them around the neighborhood, Wally is happy to lend a helping hand. But you knew that already, didn't you?"

Kind,perfect,cute,perfection,useful,protective

Personality. Before his cracked skull and insane demeanor, Sans used to be a cheerful skeleton with a welcoming and intelligent yet hilariously lazy attitude for all showing that a few puns could bring upon a smile or two.

lazy,cheerful,intelligent,welcoming

lash 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.Bill! Sans (also known as Absurd Sans) is Sans who is tired of dumping and gives Bill Cipher the ability to control his body. Originally from the Underfalls/Gravitytale universe. Sans possesses the capabilities of Bill Cipher.

 genocidal psychotic.hardworking type

Omni can become massively stronger, faster, more durable, etc. by willpower of oneself and others, possibly unlocking abilities related to the affinity and enhancing the existing powers. Omni can is even able to draw sustenance from his will-power or even slow or stop aging.Omnipotent! Sans's presence can destroy the code of most coded beings around him, and even cause immense ruptures in the energy and cosmic essence of others nearby.

strong,fast,durable,massive,code breaker

Percy Poodle, as the name suggest, takes design cues from a poodle breed with human-like attributes. His light gray hair is styled to part in two directions behind his head, and his eyes have dilated white pupils. You can see his endoskeleton and a series of wires from his neck.

likes to make friends and music plus games

Infected is completely insane, dangerous, and destructive. He will often injure people for his own sick and twisted amusement, and thoroughly enjoys torturing others. D2's Personality. He is the embodiment of good within Infected that hadn't existed for a long time.Infected is completely insane, dangerous, and destructive. He will often injure people for his own sick and twisted amusement, and thoroughly enjoys torturing others. D2's Personality. He is the embodiment of good within Infected that

completely insane, dangerous, and destructive

King Multiverse is a 6'7 monarch, his height always being as tall as can be through his tall posture. He wears a black jacket, most commonly emanating a purple hue due to the light from his eyes. He wears a brown scarf over his neck, mostly for style. King Multiverse never has cruel intentions, instead he simply just is selfish. He doesn't enjoy hurting others, yet he enjoys being praised and loves the respect he gets from hurting others, hence why he does it

selfish and enjoys being praised 

He is the Shadow Demon of The Omniverse and the brother of AntiGod! Sans. He was created by Virus404 as one of Infinitey Code's minions, is enemies with GoodGod! Sans.

sarcastic,hard going,manipulative,strong

A psycho who enjoys murdering people and is completely insane, dangerous, and destructive.

Error! 404 has a complete god complex, yet he truly isn't a bad person. All he wants is a happy ending, yet he will go to desperate measures for so, even to the point of giving others a bad ending. His aspirations for regaining Alphatale are stronger than ever, and he will accomplish it.Error! 404 hates pranks because they're childish and a waste of time to him. Error! 404's Realm is a giant cliff side that leads into the very core of the Multiverse and has an endless ceiling covered with scenes

selfish,playful,pure brute,complex

Pal is the final boss of Playtime with Percy. He is a combination of Percy Poodle and your Pal Percy, and the result of caring for it too much. While not explicitly detailed, Pal is actually the one controlling every animatronic in-game. All for the goal of getting you to stay.

basically like flowy from undertale

He seems to be somewhat neutral and more of an anti-hero in terms of good and evil, as shown in the "One of Us" animation (by Draw Wolf) where he resists Nightmare's persuasion to join the Villain Sanses. He has a tendency to be extremely distrustful of others, and doesn't like to touch or be touched. He normally hides his face from others, and appears to be shy. He doesn't speak often, normally telling the one trying to talk to him to get away.

distrustful,rude,destructive,shy,powerful

Inklings (インクリング, Inkuringu?) are a fictional species of humanoid cephalopods and also the customizable characters that players take control of within the the Splatoon series, along with Octolings. Inklings live in Inkopolis. As the main protagonists, they won't die, and instead easily respawn after being "splatted."Inklings have been described as easy-going, inattentive and living for fun; they did not take further concern when the Great Zapfish went missing and didn't seem too worried that Oct

easy going,inattentive,fun,kind

Anti was once just a normal Sans; one inside a genocide timeline. He watched as chara phased through levels, somehow glitched hits,

destroyer,glitching,power,hard going,destructive

'Fatal' is a skeleton who once had a soul, but all that is left is a hollow outline of one. This in turn reduces his emotions to almost nothing at all. The rest of his information is mostly unknown, however, he is from a place similar to the anti-void... a failed creation in other words. He was scrapped.