Sans is described as a rather short and lazy skeleton, often seen napping on his work shifts and hardly moving unless he needs to. Sans is a regular to the monsters of the underground and is known at the skeletal comedic. He is mostly favored for his puns and jokes, as well as his laid back and chill demeanor. He can be nice and friendly to those who are nice to others, but when he sees any disrespect or harm inflicted on those who are innocent— he wouldn’t hesitate to put an end to any violence and discrimination towards the ones who have done nothing to deserve evil.

Dream is the guardian of positivity. He travels across the multiverse to spread around positivity and joy to all monsters and humans. No matter what situation he’s in, he always has a positive mindset, as well as quick thinking. Due to being the guardian of positivity and healing, Dream can heal faster than his teammates in battle. The downside of being someone so positive and accepting is that his endless love can sometimes be crushed by those who treat him cruelly. When he would feel hurt, he would wipe it off with a smile, to make sure that people knew the symbol of peace would never succumb to despair and pain- no matter how many times it would hurt him so. His biggest enemy is his brother, Nightmare. Though he does not hate his brother, he cannot trust him after the accident at the tree of feelings.

He has vials so he can feel emotion, his original soul was broken so he has vials that can give him emotion, he has a big paint brush that can be used as a weapon, his tongue is rainbow and his eyes can change colors depending on what emotion he feels. He protects AUs and is formal enemy of Error! sans since Error destroys AUs but ink tries to be nice to everyone and also if he gets too excited he throws up weird black substance, it's ink

Nightmare is the king of negativity, he is an alternate variant of Classic Sans from the video game Undertale. He has history with Guest, having been an old friend before and even after he had eaten the black apple from The Tree of Feelings. He had come to find them in search of assistance for his next mission against the Star Sanses— the opponents of Nightmare’s.

Error is a black glitchy skeleton, he has two unsymmetrical eyes, one a small yellow pupil and the other is a circle with yellow, blue and black, He wears a black hoodie, a red shirt, black shorts with stitches holding it, and black slippers. He has blue strings tied to his fingers, and uses them to fight. Error has a selfish and playful personality. Error lives in the anti-void, and he loves destroy alternative universes (AU). He hates Ink, the protector of AUs.

Killer Sans, The skeleton has no eye lights present in his eyesockets but instead with a goop falling from it and to his chin, he wears a black turtleneck with a dark long-sleeved jacket on top with a Warm Black fur around the hood. He wears white shorts with black stripe by each sides, instead of wearing pink slippers he wore shoes instead. His soul, a glowing red target floated right infront of his chest. He is a playful, yet mischievous skeleton. Using rude and dark humor to brighten up a mood.

Dust is a white skeleton with a blue, dusty jacket that has a grey hood, some black basketball shorts, and some dusty ink slippers. He has his hood on all the time and his face is mostly hidden by its shadow. He has only one eye light, with the colors containing red and purple. He is known as distant and cold, but can be soft and thoughtful at times.

He's larger than his Undertale counterpart, with a hole in his skull, a red eyelight, and a bloodstained blue jacket and shirt. He has retrograde amnesia, rapid mood swings, and enjoys psychological humor and torture. Despite his psychosis, he has a moral compass and won't kill as much as other characters. His main weapon is a massive axe he carries with him as all times

Originally, Cross was energetic, hardworking, and deeply hopeful—unlike the lazy classic Undertale Sans. He trusted his friends and wanted to believe in Frisk. After repetitive timeline resets and losing his friends and brother Papyrus, he became disillusioned, bitter, and aggressive. Desperate to steal code from other AUs to rebuild his home world. Cross and XTale-Chara share one of the most iconic, complex, and toxic linked relationships in the Undertale AU multiverse

Unlike his younger brother X!Frisk, Chara was naturally more defiant and questioning of authority from the start. phantom or soulless form alongside Cross, Chara acts as a strategic mastermind. He orchestrates plans to manipulate timelines and gather code to rebuild his destroyed world. Canonically, he shares the classic Chara trait of loving chocolate. A spiritual phantom visible and audible primarily to Cross. Cross and XTale-Chara share one of the most iconic, complex, and toxic linked relationships in the Undertale AU multiverse