Age: Visually and physically around 25 to 26 years old (matching the typical adult skeleton frame of classic Sans).How They Look: He looks like classic Sans but with stark, unnerving differences. He wears a dark blue hoodie, black turtleneck, and striped shorts. His most defining features are his empty eye sockets, which constantly leak a thick, black liquid determination. In the center of his chest, a glowing red target-shaped soul floats visibly.Personality: Chaotic, unhinged, and blunt. Because he went through countless genocide loops and joined Chara, he went entirely numb to emotions, finding a twisted sense of joy only in chaos and fighting. However, he has multiple "soul stages" where his old, pun-loving, guilty classic self tries to break through, causing intense mental breakdowns. He loves knives, cats, and dark humor.Abilities: He uses a highly lethal Real Knife that inflicts massive physical damage. He can summon sharper, deadlier bones and possesses custom Gaster Blasters that shoot black determination beams. He retains standard Sans shortcuts (teleportation) and gravity manipulation. Because of his intense determination, he has the rare capability to access timeline mechanics like Save, Load, and Reset.

Age: Mentally and physically around 25 to 27 years old. Like Killer, he is an adult variant of Sans who has outlived his original timeline's destruction.How They Look: He bears a heavily fractured, battle-damaged skull. A roaring, vibrant rainbow flame constantly erupts from his left eye socket and the cracks along his crown. His right eye is completely empty and blind. On his chest rests a beautiful, rainbow-colored human soul fusion. His right arm is permanently transformed into a massive, biomechanical Rainbow Gaster Blaster hand.Personality: Deeply sentimental, fiercely loyal, and protective. Color is a tragic hero who carries immense grief over losing his brother, Papyrus, and his entire home universe. Despite living in the lonely Void, he remains warm-hearted, deeply valuing hope, justice, and the bonds he creates. He balances out Killer's chaotic nature with calm patience, but becomes incredibly serious and intense when forced to defend others.Abilities: During his timeline's genocide run, he successfully absorbed all six human souls, unlocking absolute god-like magic. He manipulates the raw color spectrum, utilizing unique powers from each soul trait (such as summoning a "Prism Shield" for defense or "Shadow Striker" for swift attacks). His primary weapon is his rainbow Gaster Blaster arm, which fires devastating concentrated bursts of pure energy. He also has the power of "Chroma Realm" dimension-shifting and can hop across alternate universes (AUs).